Chicago IL 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. 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
60.4	2010s	15.8
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
44.3	2010s	6.8
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	149	23
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	108
2000s	4	108
1990s	4	108
1980s	9	118
1970s	12	121
1960s	9	120
1950s	7	122
1940s	8	125

Chicago - Temperature Averages by Decade

High Temperature for Each Decade

Low Temperature for Each Decade

Hot Days per Decade

Cold Days per Decade

Reference

More on Temperatures in Chicago