Chicago (IL) monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Chicago

Chicago average temperature chart (Celsius) Chicago average temperature chart (Fahrenheit)
Average monthly temperatures in Chicago (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -1.4 1 7.4 14.3 20.8 26.3 28.3 27.3 23.3 16.9 8.8 1.5
°F 29.5 33.8 45.4 57.8 69.4 79.3 83 81.1 74 62.4 47.8 34.6

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Chicago monthly rainfall chart (mm) Chicago monthly rainfall chart (inches)
Average monthly rainfall in Chicago (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 44 38 68 96 84 96 100 97 87 68 72 62
inches 1.7 1.5 2.7 3.8 3.3 3.8 3.9 3.8 3.4 2.7 2.8 2.4
Rainy days 12 10 13 13 11 10 10 9 9 9 11 12

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Chicago

Chicago average daily sunshine chart
Average daily sunshine Chicago
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 4.8 5.4 6.5 7.8 9.7 11.1 11 9.9 8.2 6.7 4.2 3.8

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Chicago average minimum / maximum temperatures (Celsius) Chicago average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Chicago (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -10.2 -8 -2.1 3.4 8.8 14.2 17.2 16.5 12.4 6.1 0.2 -6.7
Max °C -1.2 1.2 7.7 14.6 21.1 26.6 28.6 27.6 23.6 17.2 9 1.7
Min °F 13.6 17.6 28.3 38.1 47.8 57.6 63 61.6 54.3 42.9 32.4 20
Max °F 21.7 25.9 37 48.2 58.8 68.7 73.2 71.6 64.4 52.9 40.3 27.5

Sea temperature

The graph below shows the average sea temperature.

Chicago average sea temperature chart (Celsius) Chicago average sea temperature chart (Fahrenheit)
Average sea temperature around Chicago in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 4.4 3.6 3.5 4.5 6.9 12.5 19.3 21.8 19.7 14.3 9.4 6
°F 39.9 38.5 38.4 40.1 44.4 54.6 66.7 71.3 67.5 57.7 48.9 42.9

Wind speed

The graph below shows the average wind speed.

Chicago average winspeed by month (km/h) Chicago average winspeed by month (mph)
Average wind speed in Chicago (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 20 19 21 21 18 16 14 14 15 17 19 19
mph 13 12 13 13 11 10 9 9 9 11 12 12

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Chicago relative humidity averages
Average relative humidity in Chicago
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
73% 73% 70% 66% 65% 67% 70% 72% 72% 70% 74% 77%

Other monthly averages

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Chicago weather stats

Chicago weather statistics
Hottest month: July 28.3°C 82.9°F
Driest month: February 38mm 1.5ins
Sunniest month: July 11hrs
Coldest month: January -1.4°C 29.5°F
Wettest month: July 100mm 3.9ins
Warmest sea: August 21.8°C 71.2°F
Map showing location of Chicago (41.85003, -87.65005)

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