ASK TOM WHY: July and August are usually hot months, but has June ever been the warmest month of the year?

Dear Tom,

July and August are usually hot months, but has June ever been the warmest month of the year?

Ron Miles, Schaumburg

Dear Ron,

Normal temperatures in June, July and August (O’Hare International Airport data) are 68.9, 74.0 and 72.4 degrees, respectively, but the weather in Chicago’s highly variable continental climate sometimes departs widely from those climatological averages. June can be a year’s warmest month if its temperatures run well above normal, followed by significantly sub-normal temperatures in both July and August.

That has happened only three times in 142 years (1871-2012) of official temperature data. July was the hottest month of the year in 97 of the 142 years. August, with 40 occurrences, stands in second place. June was the warmest month in 1933, 1967 and 1971 (and September in 1884 and 1891).

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