Illinois · county areal climate 1951–2025

Cook County, IL

A 37.8" / 50.7°F normal · 2025 ran 80% of normal precipitation.
2026 so far · through Jul 25: This area is at 107% (23.94") of the 1996–2025 to-date normal — the 20th wettest start of 76 years. Temperature +1.5°F vs normal. U.S. year-to-date →

Normal (1996–2025)

37.8in
annual precipitation · 50.7°F

2025 vs Normal

80%
30.1" · 51.5°F (+0.8 vs normal)

Wettest Year

49.2in
2019

Driest Year

22.8in
1956

Biggest Rain Day

4.85in
Jul 18 · 1996

Warmest Year

54.1°F
2024

Record

1951–2025
75 complete years · NOAA nClimGrid

Monthly Climate

25°
J
28°
F
38°
M
49°
A
60°
M
70°
J
74°
J
72°
A
66°
S
54°
O
41°
N
30°
D
—— normal temperature (°F) · ▮ normal precipitation (in) · 1996–2025
Areal nClimGrid averages (NOAA/NCEI) over the whole area — an average across the region, not a single station. Separate from the station records.

Nearby

← All Illinois countiesU.S. overview
WettestSince · browse by state · precipitation & snowfall records · NOAA/RCC-ACIS ThreadEx gauge record · part of Weather Trader · supported by Substack Subscribers
© 2026 Weather Trader · All rights reserved