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The 42.5 inches of snow that fell was a monthly snowfall record. Here are the high and low temperatures for each day. Warm minimum temperatures are an indication of very high humidity. Minimum temperatures were in the 80s for 5 consecutive nights, the longest such string in Chicago history. July 26 through Jwas one of the most oppressive periods of heat and humidity ever in Chicago, rivaling the heat wave of mid July 1995. There were 13 days below zero for the month. (average temperature at Aurora was 8.9) There was a record stretch of 10 days in a row with minimums below zero. The second coldest January on record with an average temperature of 11.9. The winter of 1903-1904 was also the 7th snowiest winter on record with 59.5 inches. Both downtown/lakefront and inland temperatures are given for comparison when available.
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Temperature records can vary from downtown or lakeside locations to the inland airport sites. O’Hare Airport became the official Chicago observation site in 1980. Note that the official weather observatory was downtown or at the University of Chicago until 1942 when Midway Airport became the official Chicago observing site. It does not attempt to rank or compare events.Ĭhicago temperature and rainfall records go back to 1871 and snowfall records go back to 1886. Factors that were considered were number of casualties, amount of property damage, impact on travel and commerce, and uniqueness of the event. The Chicago National Weather Service Forecast Office went back through the record books to come up with a list of the 20 most significant weather events that occurred in Chicago and surrounding areas from 1900 to 1999.