How Bad Has Chicago’s Spring Weather Been?

An attempt to give a quantifiable, data-based answer a well-worn but extremely important question, especially to all Chicagoans: so how about this weather we’ve been having lately? (Hint: it’s as bad as you think.)

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We get questions!

Actually, sometimes people ask questions and I take the liberty of answering them. But I thought it would be an interesting question to answer, since it involves trying to quantify a subjective experience: what is “bad” weather? I took the April data for the past five years—because I figure April is the first month that we, as Chicagoans, can fairly expect something like consistent spring weather, and five seemed like a reasonable assumption for what a person can “remember"—and looked at the numbers.

* Temperature: The average monthly temperature in April, as of 2011, was 47.7 degrees. The departure from normal was -0.1 degree. Which doesn’t sound bad, and wasn’t as bad as prior Aprils. But that doesn’t tell the whole story. The average high was 56.3, the lowest average high in five years. The average low was 39.3, only the third lowest average, but generally speaking, people are going to be experiencing the highs more than the lows, since that’s when they’re outside, or at least wanting to get outside. Verdict: Worst, sorta

* Wind: The average wind speed was 11.8 miles per hour… 0.1 mph higher than 2007. Verdict: Worst, barely

* Precipitation: 4.90 inches total, 0.6 of snow/ice/hail. 16 days with more than 0.1 inch. 2009 had more precipitation (5.19 inches, 2.1 of snow/ice/hail)… but ties with 16 days of 0.1 inches or more. I’m going to give it to 2009, but it’s close. Verdict: Not the worst, barely

* Sun: 1 clear day in April 2011 (!); 11 partly cloudy; 18 cloudy. Compare to 3/18/9, 5/12/13, 4/15/11, 6/13/11. That one wasn’t even fair. Verdict: Worst

* General crappiness: The NOAA recognizes certain atmospheric conditions like fog, heavy fog, thunder, ice pellets, hail, freezing rain, duststorm, smoke or haze, blowing snow, and tornadoes. I lumped them all in to bad weather, and gave each day a point for each category, and then counted the days with some form of crappy, depressing weather conditions. April 2011 had 32 general crappiness points over 21 crappy days, compared to 23/13, 23/15, 22/15, 24/14. Verdict: Worst

* Barometric pressure: Low pressure is associated with storms, physical ill being (in theory). The lowest pressure for an April in the past five years? 29.17 inches in April 2011. The average barometric pressure was also the lowest (29.86; all other years were above 29.90). Verdict: Worst

Conclusion: April 2011 is clearly the worst April in five years. If you were thinking this weekend that this has been the worst spring you can remember, I think you can fairly say that, up until that point, you are right. If you were thinking it’s the worst more because of conditions instead of temperature, you’re both right and particularly observant.

So there we have it: 2011 is officially the worst spring you can remember.*

* Provided by “spring” you mean “April” and you can only remember back five years. May not apply for other definitions of “worst.” All data from the NOAA and


Photograph: Whet Moser



3 years ago
Posted by awfulwaffle

Nice. I'm expecting some serious payback from mother nature, by way of the awesomest summer weather ever.

BTW - I get the feeling that this year's temperature and precipitation would trend much closer towards "worst" if you take out, say, the three highest and lowest temps of the month - since there were some clear anomalies.

Also, a five-year span seems far too narrow. Would be interesting to see how this spring stacks up against Chicago springs over a 50 or 100 year span. Where did you get your data from? Maybe I'll crunch through some of the numbers later.

3 years ago
Posted by former_chicagoan

Chicago sucks. Illinois sucks - at least the NE corner of it. I moved out of the city 10 years ago to the burbs but it's only mariginally better out here. Between crap weather, high taxes, unjustifiably high cost of living, crime, corruption, politics - it's a stew of malaise. We've been waiting since August for some decent weather, we had a good run in Oct otherwise the weather here has been as bad as any year I can remember. I wish I could leave but I am stuck for a while due to personal reasons and commitments.

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