![]() ![]() At least three heat-related deaths were reported in Chicago the week of May 9. A rapid change from cool to hot weather, especially early in the warm season, is associated with an elevated risk of heat-related health impacts. The heat itself was remarkable, but so was how quickly it arrived following prolonged cooler weather in April and in the first week of May. Peoria recorded its earliest 73-degree nighttime low temperature on record (back to 1883), which beat the previous record by two weeks. Rockford reached its earliest 75-degree dewpoint temperature on record (back to 1959). The heat was accompanied by summer-like humidity, and dewpoint temperatures regularly reached into the upper 60s and low 70s. Rockford broke daily high daytime and daily high nighttime temperatures in four consecutive days that week, and both Rockford and Chicago recorded their earliest 70-degree nighttime low temperature on record. In fact, the week of May 9 to 15 was one of the warmest on record for May statewide, with temperatures persistently 8 to 20 degrees above normal (Figure 2). Daily May average temperature departures in Chicago. Three of these days, May 10–12, were more than 20 degrees warmer than normal in Chicago. As Figure 1 shows with daily temperature departures from Chicago, temperatures in the first seven days of May were 4 to 8 degrees below normal, but that was followed by six consecutive days with average temperatures at least 10 degrees above normal. ![]() While the first week of May delivered the same cooler weather as in April, temperatures quickly ramped up in the second week. Spring Arrives… As Does Summerįollowing a cold and dreary April, folks in Illinois were begging for a taste of summer. The preliminary statewide average total May precipitation was 4.37 inches, 0.40 inches below the 1991–2020 average and the 76 th driest on record statewide.ĭata are provisional and may change slightly over time. ![]() The preliminary statewide average May temperature was 64.7 degrees, 1.4 degrees above the 1991–2020 average and the 29 th warmest on record going back to 1895. ![]()
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