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Showing results for tags '100+'.
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Number of 70º+ days for Chicago by month/year. Period of record: 1872 to 2014 Longterm averages are the entire data set. City averages are from when the official site was near the lakefront or downtown (1872 to June 1942). Airports averages are when the official site was either Midway or O'Hare airport (July 1942 to present).