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Climate Statistics · City

Normal annual rainfall in Chicago

1991–2020 · 1 data point Updated Oct 21, 2026
Climate · Chicago

Source: NOAA National Centers for Environmental Information — GHCN-Daily, 1991–2020

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Latest value · 1991–2020 40.9 in
Weather through the year long-term average 1991–2020 · Chicago Midway Ap 3Sw weather station, 20 km away
32° 19°
Jan
37° 22°
Feb
47° 31°
Mar
60° 41°
Apr
71° 52°
May
81° 62°
Jun
85° 68°
Jul
83° 66°
Aug
76° 59°
Sep
63° 46°
Oct
49° 35°
Nov
37° 25°
Dec
2.3
2.1
2.7
4.1
4.8
4.5
4.0
4.1
3.3
3.9
2.7
2.3
High and low, °F Precipitation, inches

Source: NOAA National Centers for Environmental Information — GHCN-Daily, 1991–2020

What it means

How much rain and snow (as water) falls in a typical year.

How it is calculated

Sum of the twelve monthly precipitation normals at the nearest weather station: 1991–2020, or the latest ten years; months with a few missing days are scaled up.