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Snow, whose water content is usually less than rain, tends to last longer. Cold-season precipitation ends to be long-duration, though of light intensity. Precipitation intensity is important also. In the years from about 1970 onward, heavy precipitation totals have been occurring more frequently in the late summer and early autumn (especially August and September). It should be noted that these figures are merely averages precipitation occurrences in Chicago’s rough-and-tumble climate often vary greatly from the averages in any given year. Somewhat heavier precipitation, 0.10 inch or greater, ranges from 4.6 days in February to 7.1 days in May, and heavy precipitation, 1.00 inch or more, ranges from two tenths of a day in February to 1.0 days is August. Precipitation of 0.01 inch is very light, and is likely not to be noticeable. September averages least days per year, with 8.2, and April the most, with 11.8. It’s most frequent in the spring and least frequent, usually, in the autumn and winter. The precipitation is not spread evenly through the year, however. I am curious as to how many days we have precipitation in Chicago.Ī review of Chicago’s precipitation records for the entire period of official records, 1871 through 2016, reveals that measurable precipitation (0.01 inch or greater) falls on 125 days per year, or one day out of three.
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Please look at the time stamp on the story to see when it was last updated. Click here to support Block Club with a tax-deductible donation.This is an archived article and the information in the article may be outdated. Every dime we make funds reporting from Chicago’s neighborhoods. Thanks for subscribing to Block Club Chicago, an independent, 501(c)(3), journalist-run newsroom. Every dime we make funds reporting from Chicago’s neighborhoods.Ĭlick here to support Block Club with a tax-deductible donation. Subscribe to Block Club Chicago, an independent, 501(c)(3), journalist-run newsroom. “We gotta wait for the Great Lakes to warm up a little bit,” he said. Walker said Chicago will not see consistent sunshine until “probably June.” “But maybe bring an umbrella just in case.” “You won’t need a coat at all,” Donofrio said. Monday could hit 80 degrees, and temperatures during the week are expected to be warmer than normal, Donofrio said. Next week will see “a tale of two seasons,” Donofrio said. “It’s the battle of a lake that’s really cold and large, versus the national warming that’s starting to happen.” “That’s the nature of April and May, what happens with Lake Michigan,” Donofrio said. “Spring so far in Chicago has been cloudy, cool, frequent storms passing by the south, bringing up rain every couple of days, keeping us on the cold side of things.”ĭonofrio described weather patterns this spring as “the perfect recipe for cool and cloudy conditions.”ĭonofrio predicted the wet, cloudy weather will likely stick around through the spring. “It’s a pretty substantial swing, but certainly not out of the ordinary,” Walker said. Paul Walker, senior metrologist with AccuWeather, said there were only six days without rain last month.Ĭhicago was also 2.7 degrees cooler than an average April, Walker said. “It’s been much cloudier than usual.”ĭonofrio said this April saw 1.56 inches more rain than usual. “This year, we’re stuck with heavier spring jackets, maybe one that has rainproof on it with a fleece underneath,” Donofrio said. In July, the warmest month, the average day time temperature rises to 83.5☏. Though still gloomy, there were seven sunny days recorded in April 2021. Chicagos coldest month is January when the average temperature overnight is 14.3☏. That report was followed by another dark and soggy day. The National Weather Service categorized just one day in April as “clear and sunny,” said Kevin Donofrio, science and operations officer. NBC 5 meteorologist Paul Deanno said Tuesday just one of the past 42 days saw significant sunshine. CHICAGO - Chilly, wet and dreary - that’s how weather experts are describing the extreme bummer that has been spring in Chicago.