Chicago - Temperature Averages by Decade





Summarized here are the temperatures extending over eight decades at Chicago, Illinois. Listed for every decade from the 1940s to the 2010s are averages for maximum and minimum daily temperatures in degrees Fahrenheit and Celsius. That's followed with information on the number of hot and cold days.

Each decade covers a standard 10-year range. For instance the 1990s includes weather measurements from Jan 1, 1990 to Dec 31, 1999. Measurements are missing for the years 1980, 1941 and 1940. The 2010s data go to the end of 2018. All the temperature data were collected at Chicago's Midway Airport.

High Temperature for Each Decade

Average daily maximum temperature at Chicago
High °F Decade High °C
60.6 2010s 15.9
59.8 2000s 15.4
60.2 1990s 15.7
59.8 1980s 15.4
58.7 1970s 14.9
59.0 1960s 15.0
59.8 1950s 15.4
59.3 1940s 15.2

Low Temperature for Each Decade

Average daily minimum temperature at Chicago
Low °F Decade Low °C
44.4 2010s 6.9
43.7 2000s 6.5
43.8 1990s 6.6
41.9 1980s 5.5
41.5 1970s 5.3
41.9 1960s 5.5
42.2 1950s 5.7
40.9 1940s 5.0

Hot Days per Decade

Total days per year on average when the temperature in Chicago reached at least 70 or 90 °F
Decade 70 °F
21 °C
90 °F
32 °C
2010s 150 24
2000s 144 17
1990s 142 21
1980s 144 23
1970s 144 21
1960s 145 19
1950s 149 28
1940s 142 24

Cold Days per Decade

Total days per year on average when the temperature in Chicago dropped to 0 or 32 °F or lower
Decade 0 °F
-18 °C
32 °F
0 °C
2010s 5 106
2000s 4 108
1990s 4 108
1980s 9 118
1970s 12 121
1960s 9 120
1950s 7 122
1940s 8 125
Reference

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Year, Version 1.0. NOAA National Centers for Environmental Information.

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