Sweltering in Spring: Chicago’s historic heat wave 47 years ago

From extreme cold to extreme heat

1977 was a year of extremes for Chicago’s weather. January 1977 was exceptionally cold, with a record 17 days at zero or below and an average temperature of just 10.1 degrees, making it the city’s coldest month on record. By mid-May, the weather shifted drastically with an early-season heat wave that brought nine consecutive days above 90 degrees, making it the warmest May on record with an average temp of 69.3 degrees — 10.4 degrees above the monthly normal of 58.9 degrees.

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