Chicago Temperatures: Averages by Month
The numbers here tell you how hot and cold the weather usually is in Chicago, Illinois during each month of the year.
The average high and low temperatures are listed below by month and annually for Chicago, in both degrees Fahrenheit and Celsius.
Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.
To find out how often it rises over 70, 80 or 90 °F each month in Chicago, scroll down farther. There are also monthly and yearly counts of days with freezing weather.
All the numbers are averages, based on climate data gathered from 1981 to 2010.
|High °F||Low °F||High °C||Low °C|
Days of Hot Weather in Chicago
Temperatures don't normally reach 100 °F in Chicago. But it does get into the 90s on an average 14 days a year.
The days are above 50 degrees from June to September and nearly every day in May and October. But Chicago only gets that warm for a few days in winter.
Freezing Temperatures in Chicago
Freezing temperatures can occur anytime from November to April in Chicago. Typically, for seven days each year the thermometer drops to zero degrees Fahrenheit (-18 °C) or colder.
The daytime temperature doesn't rise above freezing for 43 days annually, on average. November to March is when weather this cold can last all day.
National Climatic Data Center. NOAA's 1981-2010 Climate Normals.