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  • Tim McGill

More Sizzle Left In Summer Of 2020

O'Hare fell just short of 90° yesterday with a high of 88. It was the 17th out of 21 days so far this month that have been above average. More above average days are coming and more 90s too. My blog yesterday mentioned that there have been 25 90-degree days so far this summer. By the end of next week it appears we will probably have 28 or more 90-degree days in the books which would double the amount we get during an average summer.

Today's highs should again be near 90° with upper 80s more most areas.

The meteogram below shows forecast high temperatures from several models. Most models suggest 90° or hotter for the several days next week. The peak of the heat would be the middle of next week with middle 90s possible for highs.

Our rainfall deficit continues to deepen. O'Hare is down 3.83 inches below average since July 1st. Only a few chances for some showers or thunderstorms on the horizon. The GFS model shows opportunities for rain on Sunday night into Monday and Friday next week.

Climate Central's study of summers analyzed 242 cities across the country. 74% of those cities an have seen an extra week or more of days with above-normal temperatures. Our current decade has seen more warmer than average summer days during summer for Chicago than any other decade in the past 50 years.

42% of the cities in their study saw an increase in average summer temperatures of more than 2° since 1970. Chicago's increase has not been as dramatic but there has been a small increase in our average summer temperature.

The longer range temperature probability forecasts keeps the heat coming through the end of this month. The 6-10 day forecast has us outlooked for above average temperatures overall from August 27th through the 31st. The 8-14 day forecast has us outlooked for near normal temperatures overall from August 29th through September 4th.

There continues to be hope for rainfall to help diminish our recent rainfall deficit. Both the 6-10 day and 8-14 day precipitation probability forecasts have us outlooked for above average precipitation for the end of the month and the start of September.

Here is my 7 day forecast:

Today: Mostly sunny High: 89

Sunday: Partly cloudy, isolated t-storm possible late Low: 68 High: 89

Monday: Partly to mostly sunny Low: 70 High: 91

Tuesday: Mostly sunny Low: 71 High: 92

Wednesday: Mostly sunny Low: 72 High: 93

Thursday: Mostly sunny Low: 72 High: 93

Friday: Partly cloudy, sct. t-storms possible Low: 69 High: 85 (78 Lakefront)



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