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Summer Baseball and Weather Factors

The uniqueness of 2020 has caused the Major League Baseball (MLB) season to be compressed into sixty games.  One might think a baseball season starting in July (as we have this year) would bring little worry in the weather department.  After all, as I explained in this previous post, April historically sees the most weather-related postponements – with nearly 40% of the total occurring in that month.  This makes it possible for most games to be made up well before they produce significant playoff implications.  Not only can it be cold in April, but it is more prone to see long-lasting rain (or snow) events which postpone games into summertime. 

Summer Rainfalls Delay Games

By contrast, summer rainfalls connected to thunderstorm activity seldom last more than a couple hours.  It is less common for these shorter-duration rainfalls to wash out a baseball game unless team officials are very impatient.  However, delays due to summertime rain and/or lightning are not uncommon.  While these weather issues do not so much inconvenience the fans now limited to attending games virtually, they still cause plenty of headaches for team and MLB officials.

April of 2018 Postponements

In the 2018 regular season, over fifty major league games were postponed because of weather, tied for the second most since good records of such statistics began in 1986. True to form, April of 2018 was the month that produced more than half of that season’s postponements.  Many of these were due to unseasonable cold in the Midwest and Northeast (where the month ranked among the top 10 coldest on record in nearly two dozen states), including three consecutive games at Target Field in Minneapolis postponed due to a mid-month blizzard. Of those games that were played, a large proportion had conditions more conducive to football than baseball.  According to this Chicago Tribune article, 35 MLB games were played in April, 2018 when temperatures at first pitch were 40 or lower — compared with only two such chilly gatherings in the entire 2017 season!  

Wildfires and Named Storms

Another late summer weather issue — seen more often in the past twenty years — is the threat of tropical storms and hurricanes.  Postponements due to these named storms could play havoc in the next few weeks.  The Atlantic hurricane season has produced a record number of storms through the 15th of August with conditions very favorable for many more storms in the next few weeks when activity usually peaks.  If tropical weather threatens, some games might end up being played on schedule only by changing their location.  The 2017 hurricane season forced MLB to move several games to locations other than where they were originally scheduled. 

Out west, excessive heat and unseasonal thunderstorm activity at the onset of peak fire season has promoted an outbreak of more than two dozen California wildfires. As I write, fires threatening some of the distant Bay Area suburbs were spreading smoke over the region. If the situation worsens, it may be difficult at times to play baseball games at Oakland Coliseum and Oracle Park.

With creative scheduling already fully operational just four weeks into this baseball season, one can expect more unique measures to come! Because decisions on delaying or postponing games are very sensitive to the exact weather conditions, baseball fans can benefit from looking at a very detailed forecast — such as those provided at this site.  

So be aware that, though the late start to 2020 baseball allowed us to avoid early season cold weather, the threat of rain, tropical systems, and even smoke from fires will keep teams and fans ever-vigilant for the upcoming games scheduled in outdoor stadiums!

Friends in High Places – Forecasts for Mountain Visits

When planning mountain visits or traveling through higher terrain a good weather forecast is very helpful. The ideal forecast will account for the various effects of changing elevation on area weather.  The most dramatic difference is related to the cooling that occurs with increased elevation.  If no other changes occur to a dry air mass, it will cool at a rate of one degree Fahrenheit for every 185 feet of added elevation (adding up to 5.4 degrees per 1000 feet!).  Put in a more practical example, a drive from Yoder, CO (east of Colorado Springs) to Pike’s Peak (60 miles by road) can result in as much as 47 degrees of cooling.  If you click on these location names above, you’ll open a window to their local National Weather Service (NWS) forecasts.  Be sure to take a jacket, and maybe a stocking cap, even if making such a trip during July!

Snow-capped mountains remind us that temperatures will vary widely with elevation, even during the summer months. Use this to your advantage to take a refreshing break from the heat! (Photo credit – Lesly Derksen via unsplash.com)

A second significant difference created by elevation will be potential for rainfall.  The cooling of air with height will more easily allow any moisture in that air to condense and fall as rain, especially near the warmest part of the day.  That’s why residents of many western cities so often observe thunderstorms over the mountains during summer afternoons. 

Across the Border – Canadian Weather

For those living or traveling in Canada, the Environment Canada website is a valuable source of weather information.  I recently took some time to explore this site and was pleased with its layout and wide range of current weather and forecast details. Good news for those on the road is that the new WeatherCAN app will provide this information to your mobile device!

The top three features of the Environment Canada site that I recommend are

Hourly temperature and wind conditions and future satellite imagery are also available in the Astronomy section.

Tips for the Journey

Are you planning longer mountain visits or day trips to the high places?  Consider these steps to planning a successful excursion.

  • Conclude your hiking by early afternoon, before the highest rain chances begin.  Most of the rain on such days will fall on the windward side of the mountain ridge.  Because warm air is lighter than cool air, that will often be on the side of the mountain will the greatest elevation drop to the nearby valley.  For example, in Colorado, this makes the area from Castle Rock to Colorado Springs particularly susceptible to summertime afternoon storms as the hot air from the Plains is lifted along the slope of the Front Range. 
Rain chances are often higher over the mountains during summer afternoons as compared to nearby lower elevations. (Photo credit – Sean Pierce via unsplash.com)
  • When deciding where to camp, talk with someone familiar with the area weather pattern who can steer you to the “other side of the mountain” from where the rains are most prolific. 
  • When finding a source of forecasts for your location, make sure it also allows easy COMPARISON with forecasts for nearby locations.  Did you know that you can request your NWS forecast for any specific latitude / longitude coordinates or by any location name in the USA?  This is important when there is a range of elevations with which to work!  Bookmarking that specific location forecast will make for an easy return to that location forecast later.  The forecast may not get the details exactly right, but you’re going to have the best idea of what’s possible allowing you to take the appropriate clothing and other gear.

Staying Cool — The Season’s First Heat Wave

It is easy to be caught off guard during the season’s first heat wave – the year’s first transition of the weather from comfortably warm to intensely hot.  Perhaps your heat pump needs a few hours to adjust to cooling mode, and you must endure a steamy night.  Maybe the sunscreen and swimming suits are still in winter storage or, even worse wherever they were last placed after that last warm day back in the fall!  If you can see a Midwest heat wave coming, it’s going to look like multiple days above 90 degrees with dewpoints in the 60s or higher, especially when night time lows remain at or above 75 (see the hourly forecast image below for an example of this). 

Unlike the sporadic hot days often seen in the middle of spring, the case represented here brings little overnight cooling before a second day in the 90s!

Two-story houses often present a challenge for keeping upstairs bedrooms cool without excessively chilling the downstairs.  Those who sleep in a basement bedroom may be bundled up through the night, as I was in June of 2019 while visiting my new grandson and his family. I took refuge from the family cat in the refreshingly cool basement sleeping quarters!  

The Late Spring Tipping Point

In May or early June there often seems be a “late spring tipping point” prior to which the air masses are generally comfortable – both cool and dry.  Then, as though a switch had been flipped, the middle part of each day becomes oppressively hot whenever the sun is shining.   Two things are at work in late spring across the primary row crop areas of the central and eastern US – the increasing sun angle, and the increasing humidity.   This is one reason for a trend seen with daily record temperatures in recent years – for much of the spring, new record highs have tended to be set much more often than record lows.  By early June, the crops in the fields usually have established a green layer above the darker colored soil and until early fall will provide a continual supply of moisture to the low-level air.  After getting used to the spring coolness, we are thrust right into the summer heat and humidity.  Neither our bodies nor our minds have had opportunity to make a transition and it’s easy to become overwhelmed by the heat.  It is good to bring out the lighter clothing, the cooling bands, and your protective hat a couple weeks before you think they will be needed.  Notice the forecast low temperatures, the amount of sunshine and whether your house seems to be holding onto the heat through much of the night.  Most importantly of all, pay attention to what your body is telling you, remembering that we’re all a year older since the last time summer heat was in place!

After a Heatwave – Is it Really Over?

I’ve always had a bit of trouble after a heatwave with summer cool fronts that fail to cool me.  What happens right near a cool front is that any cooling breezes can drop off to near calm and the dewpoint will INCREASE.  If this is happening toward the middle of the day (when clouds and rain can be at their daily minimum) you end up more uncomfortable than had there been no front.  I remember being absolutely wiped out playing golf one day when a weak cool front delivered no relief.  To make matters worse, it was before I had developed weather wisdom regarding the sun’s power.  I not only had parked my car in the sun but, even worse, with the driver’s seat exposed to the direct sunlight. 

Hourly forecasts now are quite good at showing you when the wind direction will shift to the north or northwest, and when the dewpoint will start to improve.  Short-term forecast models aren’t always very good with cloud cover but often will give you at least some idea of what’s possible.  So be alert to the signs of the season’s first heat wave.  Taking a few steps to prepare can improve both your physical and mental endurance of this annual event!

When Will it Rain?

The summer-long question!

Now that we’re getting into real summer weather across the northern states, more areas have seen strong thunderstorms recently.  We know that just about everyone else will see strong to severe thunderstorms within the next few weeks. 

The stormy time of year overlaps with a lot of our outdoor events.  Precipitation is a lot harder to forecast in the summer because the weather systems are more subtle than cold-season storms that bring constant rain or snow across a broad area for many hours.  Thunderstorms start out as isolated cells and sometimes develop into lines or complexes, other times staying rather spotty.  The image below is from early Sunday afternoon of Memorial Day weekend. 

This radar image was from 2PM Sunday, May 24th. A severe thunderstorm watch was in place over the area within the black box, with a few specks of rainfall seen on the radar map. 

When you want to be outside HOW do you determine where and when those first areas of rain will spring up?  What direction will they move?  How widespread will they be, and if it does start raining, how heavy will it be and how long could it last? 

One great clue comes from your local NWS forecast at weather.gov.  Don’t just read the written forecast, but go to see the hourly details.  On the image below, I could see that the highest probability of rain was forecast around mid-morning and in the mid to late afternoon. 

This is the hourly NWS forecast for my location in the early evening of May 24, 2020. I did not count on a full Monday without rain, but had some confidence in shorter durations of dry weather.  Those are the times in which I (tentatively) planned my outdoor activities. 

Oh, and be sure to check back every so often during the day because the forecast can and will change as short-term trends unfold! That’s because new weather models that represent the expected patterns hour by hour are run frequently. 

For those on Twitter or Facebook, some of the NWS offices are very good about providing short-term model forecast details in their social media feeds

This image was from @NWSTwin Cities and released around mid-afternoon on Sunday of Memorial Day weekend!  That type of information will add confidence when making your outdoor plans!

3 Weather Trends to Watch

I have good news if you feel that changing forecasts toss you first in one direction and then the other.  All the weather forecast models are limited by simplifying assumptions about the vast atmosphere they represent.  That is one reason that the results can change over time.  But often, changes to the forecast are made incrementally, so they need not surprise you. To help you plan for travel and outdoor events, let’s look at three weather trends to watch.

Weather Trend Number 1: How Much Will it Rain?

The amounts will change as the event gets closer and forecasts become more refined.  Forecasters make their best forecast at each step of the process, and confidence in the results usually will increase as the event gets closer. The most useful forecasts will present the probability of measurable rainfall (percentage chance) for each hour and the amounts expected for each three to six hour time frame.

Rainfall forecasts are an important weather trend to watch.
The percentage chance tells you the probability of rain falling. The forecast amounts tell you how hard it could rain.

Weather Trend Number 2: How Warm Will it Be?

The location and strength of weather systems affecting your area will determine how warm or cold it gets.  The amount of sunshine, cloud cover and rainfall are the key ingredients “baked into” the forecast high and low temperatures. Especially if you are sensitive to heat or cold, watching this trend will point your outdoor plans in the right direction! The most useful forecasts will depict the expected temperature for each hour of the day and night — for the next three to seven days.

Weather Trend Number 3 – How Windy Will it Be?

While it’s easy to see that the wind directly affects certain outdoor activities — sports, grilling, or that ancient spring pastime of kite flying — not everyone fully appreciates how much the wind affects your perception of warmth or chill.  Wind speed can make or break an otherwise ideal weather day. The wind can also influence the way in which you’ll want to regulate indoor temperatures (opening the windows or running the air conditioner).

Keeping in mind these three weather trends to watch, try looking for your best times to be outdoors. Next week, we’ll look at one of my favorite sources of weather forecast information.

Severe Weather — Acting With “Weather Wisdom”

One evening this week provides an example of practicing severe weather wisdom. While getting ready for bed I received a text message from our daughter in Ohio informing me that they were hearing tornado sirens.  We had been communicating back and forth via Twitter and text message regarding the severe weather risk for the area, so the sirens came as no surprise.  (Though living 900 miles away, I remain her most trusted meteorologist.)  

When I looked at their local county warning map on the NWS website, the depiction was remarkable.  There were tornado warnings covering the areas just north and south of my daughter’s location, with her suburb lying in the middle of a 4-mile wide gap in between these tornado-warned areas!  I quickly sent a re-assuring message, not implying that there was no risk, but that the highest potential for damaging weather would pass just to their north.  I later learned that my daughter and her family went to the basement anyway.  This shows how well she has learned my severe weather wisdom principle of being more cautious than seems necessary around unpredictable events like thunderstorms!  My caution was enhanced with a family of nine all sleeping on the second floor of a country house in Iowa.  I vowed to be vigilant against a situation of having to awaken and rush so many sleepers down two flights of stairs to the basement in the midst of extreme weather. 

A Timely Resource

This is Easter weekend and because time is precious I now provide a link to a timely and valuable resource — one of my best posts on severe weather. This will explain both the ways the Storm Prediction Center presents its forecasts of severe storm risk categories, and also the manner in which the National Weather Service depicts warnings on their local county maps.  Though warnings generally come on a county basis, using these maps will give you a better idea of your exact level of risk when the weather radio alerts you to severe weather. 

Gardening Weather — Deciding When to Plant

Though many of our customary “rites of spring” are cancelled or postponed this year, we can still work in the garden. In many areas of the central US, winter was mild, but the wet weather of recent months has brought a slow start to spring fieldwork and gardening.  Once your soils have dried out sufficiently, you have a decision to make for deciding when to plant seeds in the ground.   While a packet of seeds is inexpensive, it’s always desirable to get the most for your investment of money and time.  So the timing of planting is a relevant question as the new growing season gets started.

The earliest I ever planted garden seeds was while living in central Iowa during the early spring of 2000.  At the end of February we had true spring weather so I planted peas along the fence row in the front yard – on Leap Day.  I recall that those peas germinated fairly quickly because March remained quite warm.  That planting did not end up thriving, perhaps due to drier than normal spring weather, or that the early season wasn’t cool enough for that particular variety.   

The more certainty we have of favorable warmth continuing, the more confidence there will be to proceed with this type of early planting.  Unless the pattern flips to unusually cold, temperatures often won’t be your main problem.  Spring sunshine is strong enough to warm the ground even when air temperatures are relatively cold, but there is no remedy for cold soils produced by wet and persistently cloudy weather.  Even though it has been mild to warm in much of the Northern US during the early spring, try to assess how cloudy and showery it’s likely to be in the 6 to 10 days ahead and use that as a guide to timing your early planting.

A typical date for first garden plantings in southern Minnesota would be at the start of April.  Such was the case in 2018 when a seasonable planting date coincided with the Opening Day baseball game at Target Field.  While the rest of the family was gone to visit relatives, I enjoyed an afternoon off work and perfect planting weather while listening on the radio to the baseball game.  The advantage of seasonable planting dates is that in April and May you are more likely to see the right mix of moisture and temperature for the cool season plants.  Plant a month early and you have up to two months when a late cold snap can set your efforts back.  Plant a month late and hot dry weather can arrive in time to hinder the fruit-bearing of plants (like lettuce and edible-pod peas) that produce better quantity and taste when it’s not too warm and sunny.

This year, our snow melted fairly early in March, and I have been looking for a window of opportunity to start planting spinach, carrots, and other things that do well in the coolness of early spring.  I have continued to wait as each warm spell has been followed by a well-forecasted chilly and cloudy stretch of days.  I was glad that nothing was planted ahead of this week’s freezing rain event which was followed by almost 48 hours below the 30-degree mark!  If I see that it’s going to be only a little cool and damp for a day or two, that will prompt me toward starting the garden during the next warm spell. 

I am even more sensitive to the appropriate time for planting fragile plants from the nursery such as tomatoes, squash, and green peppers.  Even when it’s warm enough to plant these things, a brisk wind or vivid sunshine can beat down and dry out the new plantings. Ideally, I like nursery stock to have a two or three-day window of mixed sun and clouds with a few light showers (or regular hand watering) and little wind to acclimate to life in the garden.  Once they are off to a strong start for a few days, bright sun, stronger wind, and even harder rain is usually not a problem. Confidently deciding when to plant allows enjoying these first days when we can work outdoors, while looking forward to the fresh produce we’ll gather during the summer and fall months.

Watching the Weather – Calming Action in a Stormy Time

While threats of severe weather raise the anxiety level of those immediately at risk, the current health crisis creates an epidemic of stress and uncertainty throughout the land.  It reminds me of occasions in my own life when stress increased amid uncertainty regarding the future.  At every one of those difficult times, I have been an eager an avid follower of the daily weather patterns. Watching the weather has always been my calming action in a stormy time.

One such time was during a personal health scare ten years ago.  I was so relieved that the physical misery I was experiencing turned out to be far more uncomfortable than serious.  The worst part of the suffering lasted only a few weeks but during those lowest days the simple activities of daily life brought the most comfort – trimming and collecting branches with the children in our large yard, shopping for food that would enhance my health, and my lifelong consolation of watching the sky and savoring the changing of seasons.  Within a year of that health challenge I was in a much better place both health-wise and professionally than I could have anticipated.  In an upcoming e-book I will talk more about the simple ways in which I have long enjoyed watching and taking delight in the weather and how that has comforted me amid the storms of life.

This time of year, changes in the weather can be very frequent, and sometimes quite entertaining.   Enjoying those changes may even help to calm frayed nerves and anxious hearts.  If you currently have either extra time or unsettled thoughts, it is my hope that by watching the skies a bit more you might experience some rest and consolation.   Let me now offer a few ideas for enjoying the change of seasons as fully as possible.

Increase your Knowledge

Cloud charts like this one help you match what you’re seeing out the window to its proper name and even get some idea of what is causing that type of cloud.  If you have a particular interest in severe storms and have never been to a free Skywarn Spotter Training class, it will be easier than ever to attend this year because most of the classes which typically are offered in-person were cancelled or moved to an online format.  Search for classes offered by the National Weather Service in your local area.

Watch a Movie…. Out Your Window

Clouds are parading by, people are out walking, and especially in the northern states, the landscape is changing with new bird songs, greener grass, and final snow melt.  Even if you can’t be outside yourself due to illness or quarantine, that parade of clouds and change of seasons doesn’t stop.    More than ever before, forecasts show what’s likely to unfold hour by hour, and help us to anticipate the “playlist” in the sky.  Forecasts are usually accurate, but even when they are not, the wide availability of weather information online can allow us to anticipate those times when a change in the forecast will happen. If you don’t have a great view from your own window, look for a live webcam view either from your local area or even a different part of the country.   

Look Forward to Better Weather

Changeable spring weather brings the advantage that even the most foul weather usually doesn’t last too long.  I think in terms of two levels of bad weather days.  Some spring weather bears truly hazardous potential while often it’s merely unpleasant.  Many areas of the country will experience more days with significant severe weather risk between now and early summer.  While you’ll definitely want to take appropriate caution and heed local warnings, remembering that these episodes are usually very short lived and often localized helps ease the worry.  It’s rare for severe weather to produce widespread destruction, so we can be hopeful while anticipating the calmer weather to come.  Keeping that perspective is my calming action in a stormy time.  Sometimes, the “bad days” might simply mean weather which doesn’t suit my preference.  For example, where I live, the last few days have been persistently cloudy.  Tomorrow that will change dramatically and temperatures will also be warmer.   Today, I am planning for how to use that time and savor the brighter skies!

Plan for the Good Days

Someday soon, we will be more able to spend long stretches in the yard and garden, or at the park, doing things that for the past few months could only happen in our dreams.  It’s not too late to order garden seeds or make your wish list for this year’s garden.  When you see those warmer and drier days arrive it will be a time of great enjoyment inspiring hope for the entire growing season.

Perspective on Record Temperature Trends

Looking at the long-term record temperature trends both on a daily basis and a monthly basis can bring a helpful perspective.  I have found this Climate at a Glance site to be a wonderful resource for monthly comparisons of historical temperatures and precipitation.  In the central US, we can choose almost any state or city and find that the average temperatures in winter have reflected a warmer trend over time. 

Monthly Trends Echoed Daily

How do these monthly differences translate to daily weather and what can be noted?  A closer look at daily data confirms that, at places such as Minneapolis and Des Moines, it has become rare for daily record low temperatures to be broken in the wintertime.  These locations were among 60 US cities examined in a spring 2017 study which looked at record temperatures in not just the winter months but for all months of the year.  To ensure that the results were not skewed by having too few years of data, all sites chosen were required to have weather records extending back to at least 1895.  The study noted that from January of 2010 through April 2017, record highs across the US overall occurred at five times the rate of record lows.  In some western Cornbelt locations like Des Moines and Minneapolis that ratio has been closer to eight to one!  That’s why it seemed remarkable when late January of 2019 brought an episode of record cold to the Upper Midwest.

Explaining the Disparity with Data

Here’s one perspective on why the distribution of records is so skewed.  The 30 year periods from which our normal temperature values are calculated have been warming.  Our normals are adjusted every ten years to reflect the latest 30 years of data.  We’re now using normals based on the last three full decades (1981-2010).  At the last update in 2011, we added the warm decade of the 2000s and dropped the very cold decade of the 1970s.  With this higher average temperature, you still have the typical ups and downs as daily readings vary over time in response to passing weather systems.  Though the normals are reset every 30 years (after all, we want to capture what’s normal now, not 50 or 100 years ago) the record temperatures continue to be carried from the entire period of observation – often 120 years or more.  Many of the record lows were set before observations began to be taken at airports, and before there was much of an Urban Heat Island effect.  A key point here is that the normals shift over time but the set of record highs and lows does not get an adjustment.  As a result, the fluctuations need to be that much bigger than usual in order to reach the low temperature records, many of which were set in a colder era. 

A Couple Degrees = Real Differences

So is there a disparity in variations of the record highs and lows from the normals?   Can the effect of shifting normals with time be seen in the data?   I averaged the number of degrees from normal highs to record highs and from normal lows to record lows at Marshall, MN for the month of January.  On a monthly average basis, the daily low temperature must fall 29 degrees below the normal low to reach the daily record.  The daily high temperature, on an average basis must surpass the normal high by 27 degrees to reach the daily record.  While that two degrees’ difference may not sound like much it turns out to be quite significant.  Think of how often just a degree or two determines whether we merely come close to the record or whether we tie or set a new record.   For March the average reach from normal to record temperatures is 29 degrees for highs and 31 degrees for lows – again showing a two-degree difference.

Another Notable Pattern

This disparity in frequency of record lows and highs is just one feature of the recent past climatology in the central US.  Another of the record temperature trends that is less intuitive is the rarity of seeing record highs in the summer months.  As our summer climate has become rainier and more humid, we’ve consistently seen much warmer summer nights.  That higher humidity also works against extremely hot daytime temperatures.  We might look at that more closely in the future.

Winter Severity — Statistics and Perception

I wrote a few weeks ago regarding the Accumulated Winter Season Severity Index (AWSSI) which has been developed to measure a winter severity using a combination of total snowfall and departure from normal temperature.  At that time, winter was running remarkably mild in much of the East and near to more severe than average over the Northern Plains into the central Rockies (see image below as of February 1st, 2020). 

With the winter of 2019-2020 now approaching its end, most areas of the Nation have seen little change to the Index since I wrote about the “minimal winter” at the start of February.   The main exceptions are found in a few places across the central US.  With temperatures running close to monthly normals and minimal snowfall during February into early March, the AWSSI did become slightly milder since late January from Nebraska southwestward to much of the southern Rockies.    Below are the February maps reflecting those weather patterns.  

February, 2020 Temperature Departures from the 30-year Normals
February, 2020 Temperature Departures from the 30-year Normals show that much of the Eastern United States remained very mild for a third consecutive month.

February patterns in most of the Nation were not dramatically different from those earlier in the winter, with the result being that the Winter Severity Index (see current Index map here) has changed little in locations where the winter started off well into the mild category. 

February, 2020 Percent of Normal Precip Map
The February, 2020 Percent of Normal Precipitation Map shows that most of the heaviest precipitation fell in the areas which were too warm for significant snowfall. Exceptions were primarily found in the Wyoming and Colorado mountains, where ski resorts enjoyed a wonderful season.

I think it’s really important to note how our perception of even a mild winter is affected by its effect on the human body.  The amount of cloud cover and wind are two primary influences on how cold it actually feels to our senses, but these are not measured by the Winter Severity Index.  My perception from a southern Minnesota vantage point (where the Severity Index has remained in the moderate or average categories) was that our February was much less wintery than January.   I’ll now compare the two months and reveal the likely reasons for that difference.  The average temperatures in absolute terms were strikingly similar between the two months at places like Minneapolis, because while January was quite mild our February temperatures were closer to the 30-year normal, making for no real difference overall.  Snowfall amounts were also similar between the two months and not too far from normal, but there was a difference to note here.  What was the distribution of snowfall like?  Looking at details for my location in southwest Minnesota, January had a couple significant snowfalls and several smaller events.  Each time it snowed, it seemed more snow fell within a few days.  By contrast, almost all of February’s snow fell on a single day with a generally dry pattern in the rest of the month. 

Now let’s look at a comparison of wind and cloud cover.  Average wind speed was quite similar between the two months, but February was a MUCH sunnier month.  After a near record-setting January for lack of sun at Minneapolis- Saint Paul(fifteen cloudy days and two clear days), the February ratio of clouds to sun nearly reversed – to three cloudy days and eleven clear days!  Along with less cloud cover, the astronomical calendar also helped.  With more than an additional hour of daylight compared to January, even the partly cloudy to cloudy days seemed a lot brighter in February!  So while the Winter Severity Index did not move much for southern Minnesota over the past few weeks, the two main factors in making for a much nicer February were far fewer days with snowfall and much more sunshine!

Finally, the length of winter at the back end has seemed dramatically shorter this year compared to last year in southern Minnesota. This year, several brief warm spells already had melted a lot of the snow in time for March sunshine to keep temps mild.  That’s a lot different than last year when the snowpack was still growing through March and stuck around well into April with temperatures languishing below normal (with even the daytime temperatures only a few degrees above the freezing mark). 

So when considering winter severity, be aware that some influences can be measured with an Index like the one I have shown, while other influences will only be uncovered by a closer look at the day to day weather, assisted by some perspective on what an average winter is like.  An important part of this perspective includes what we’ve come to expect – what feels normal – based on recent history!

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