October will close mild after a long cool spell
(Precipitation at 7 a.m. CDT)
Since Oct. 10, much of the Great Lakes and Midwest have felt the effect of persistently cool air. Officially, at O’Hare International Airport, the average temperature over the past three weeks has run 6.5 degrees below normal.
Only two days posted a slight temperature surplus.
During this period, there has been only one day that eclipsed 60 degrees. Currently, the fewest 60-degree days during the last three weeks of October stands at two, set in 1925.
Strong south-to-southwest winds on Tuesday will draw mild air across the Chicago area. It’s highly likely that readings will rise into the 60s. The mild air will be short-lived. Rain is expected to accompany a cold front across the metro area Tuesday evening, heralding a new push of cool air. Daytime readings on Halloween are expected to settle back into the 50s.