Chicago, Illinois - Detailed climate information and monthly weather with charts

Warmest month (with highest average high temperature) is July (84.2°F).
Month with lowest average high temperature is January (31.5°F).

Average low temperature in January:
18.2°F
Average low temperature in February:
21.7°F
Average low temperature in March:
30.9°F
Average low temperature in April:
41.7°F
Average low temperature in May:
51.6°F
Average low temperature in June:
62.1°F

Average low temperature in July:
67.5°F
Average low temperature in August:
66.2°F
Average low temperature in September:
57.5°F
Average low temperature in October:
45.7°F
Average low temperature in November:
34.5°F
Average low temperature in December:
22.7°F

Month with highest average low temperature is July (67.5°F).
Coldest month (with lowest average low temperature) is January (18.2°F).

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Month with highest relative humidity is December (75.5%).
Month with lowest relative humidity is May (64.1%).

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Wettest months (with highest rainfall) are May and June (4.1").
Driest month (with lowest rainfall) is February (1.9").

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Average rainfall days in January:
10.7 days
Average rainfall days in February:
8.8 days
Average rainfall days in March:
11.2 days
Average rainfall days in April:
11.1 days
Average rainfall days in May:
11.4 days
Average rainfall days in June:
10.3 days

Average rainfall days in July:
9.9 days
Average rainfall days in August:
9 days
Average rainfall days in September:
8.2 days
Average rainfall days in October:
10.2 days
Average rainfall days in November:
11.2 days
Average rainfall days in December:
11.1 days

Month with highest number of rainy days is May (11.4 days).
Month with lowest number of rainy days is September (8.2 days).

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Month with highest snowfall is January (11.5").
Months with lowest snowfall are May, June, July, August and September (0").

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Average snowfall days in January:
8.1 days
Average snowfall days in February:
5.5 days
Average snowfall days in March:
3.8 days
Average snowfall days in April:
0.7 days
Average snowfall days in May:
0 days
Average snowfall days in June:
0 days

Average snowfall days in July:
0 days
Average snowfall days in August:
0 days
Average snowfall days in September:
0 days
Average snowfall days in October:
0.1 days
Average snowfall days in November:
1.8 days
Average snowfall days in December:
6.7 days

Month with highest number of snowfall days is January (8.1 days).
Months with lowest number of snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in January:
39°F
Average sea temperature in February:
37°F
Average sea temperature in March:
37°F
Average sea temperature in April:
37°F
Average sea temperature in May:
43°F
Average sea temperature in June:
54°F

Average sea temperature in July:
66°F
Average sea temperature in August:
70°F
Average sea temperature in September:
66°F
Average sea temperature in October:
57°F
Average sea temperature in November:
48°F
Average sea temperature in December:
41°F

Best month for swimming (with highest average sea temperature) is August (70°F).
Coldest months (with lowest average sea temperature) are February, March and April (37°F).

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