http://blog.chicagoweathercenter.com/2013/05/15/rush-of-hot-air-into-the-city-produces-chicagos-earliest-91-degree-high-temp-in-31-years-sets-record-for-biggest-2-day-may-temp-increase/
Chicago's earliest occurring 91-degree high temperature in 31 years followed by less than 36 hours frost and a 36-degree daybreak temperature early Monday morning. Tuesday’s 91 occurred at O’Hare at 3:22 p.m., close to the time that Midway Airport was logging a 90-degree high. Both readings were more than 20-degrees above the normal of 69. It was a weather turnaround of historic proportions.
Never before in Chicago had a set of May high temperatures increased by 55-degrees in less than 2 days time!Jarring shift from wintry snows to mid-summer-level heat carries sections of the Plains and western Midwest from a foot of snow to triple-digit temps in under 2 weeks.
For a 90-degree temperature to occur here by May 14 is a rare meteorological occurrence ---something which has occurred in only 17 of the past 142 years. That puts the climatological probability of a 90 this early in the season in Chicago at just 12%---far from a slam-dunk.
Abnormal heat breaks records across at least 8 states; sends earliest 100+-degree temps into a number of cities to Chicago’s westFor a second day Tuesday, temperatures records fell across a multi-state area as heat spread eastward out of the Rockies.
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