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First Freeze Map and Average First Frost Dates ... It's estimated that a frost may occur earlier than the given date 30% of the time. So use the first frost date as an estimate—it doesn't hurt ...
It was the first time in 65 years that Chicago had ever seen a triad of 100 °F (38 °C) days. [39] Chicago nearly recorded a fourth consecutive 100 °F (38 °C) day, but the temperature reached 98 degrees at O'Hare in late morning before a weak cold front came through the area and cooled temperatures off slightly in the city area, holding in ...
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Average yearly precipitation for Illinois varies from 48 inches or 1,220 mm at the southern tip to 35 inches or 890 mm in the northern portion of the state. Normal annual snowfall exceeds 38 inches or 0.97 m in Chicago , while the southern portion of the state normally receives less than 14 inches or 0.36 m. [ 1 ]
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The maximum frost depth observed in the contiguous United States ranges from 0 to 8 feet (2.4 m). [1] Below that depth, the temperature varies, but is always above 0 °C (32 °F). Alternatively, in Arctic and Antarctic locations the freezing depth is so deep that it becomes year-round permafrost , and the term " thaw depth " is used instead.
Get the Chicago, IL local weather forecast by the hour and the next 10 days.
The Army Signal Service established the first federal weather office in the region in Chicago on October 15, 1870. [2] During May 1894 the Chicago Weather Bureau was given a new forecast area extending from the Great Lakes region all the way to the Rocky Mountains. [2]