Illinois · county areal climate 1951–2025

Williamson County, IL

A 48.1" / 56.7°F normal · 2025 ran 86% of normal precipitation.
2026 so far · through Jul 25: This area is at 64% (19.39") of the 1996–2025 to-date normal — the 5th driest start of 76 years. Temperature +2°F vs normal. U.S. year-to-date →

Normal (1996–2025)

48.1in
annual precipitation · 56.7°F

2025 vs Normal

86%
41.1" · 57.0°F (+0.3 vs normal)

Wettest Year

69.6in
2011

Driest Year

27.7in
1953

Biggest Rain Day

5.29in
Apr 29 · 1996

Warmest Year

59.4°F
2012

Record

1951–2025
75 complete years · NOAA nClimGrid

Monthly Climate

33°
J
37°
F
47°
M
57°
A
66°
M
74°
J
78°
J
76°
A
70°
S
58°
O
46°
N
37°
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.

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