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Weather & Climate
Clark County, Illinois, United States
Overview
Available climate summaries for Clark County. Origins and reference periods are unverified; stored values may include AI estimates. Treat these as estimates until independently verified.
Key Metrics
Annual Avg
11.8°C
Summer Avg
23.5°C
Winter Avg
-0.9°C
Record High
42.4°C
Record Low
-28°C
Annual Precipitation
1126 mm
Avg Humidity
78%
Summer Humidity
76%
Winter Humidity
84%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 19.5° | -2.3° | -28° | 73.5 | 85% | 57 | 63.1 |
| Feb | 22° | -0.7° | -25.6° | 64.4 | 83% | 74 | 62.2 |
| Mar | 26.7° | 5.5° | -16.1° | 86.5 | 80% | 114 | 60.6 |
| Apr | 28.8° | 12.1° | -6.1° | 117.3 | 77% | 146 | 60.4 |
| May | 32° | 17.7° | -1.3° | 119.7 | 79% | 171 | 55 |
| Jun | 41.1° | 22.5° | 2.4° | 129 | 78% | 190 | 49 |
| Jul | 42.4° | 24.3° | 9.4° | 111.6 | 77% | 193 | 33.8 |
| Aug | 39.4° | 23.8° | 9.2° | 78.1 | 73% | 174 | 37.2 |
| Sep | 37.3° | 20.1° | 3.6° | 77.1 | 71% | 140 | 55.1 |
| Oct | 33.1° | 12.9° | -4.1° | 101.4 | 73% | 101 | 53.1 |
| Nov | 25.3° | 5.8° | -13.8° | 84.9 | 78% | 67 | 55.3 |
| Dec | 21.1° | 0.2° | -18.9° | 82.5 | 84% | 49 | 60.9 |
Data sources
Estimates and unverified origins
Oyster List climate data - Climate origins are unverified. Available methods include historical APIs and AI estimates; stored rows do not identify the original dataset, reference period, or model for each value. Treat these summaries as estimates until independently verified. Record updated 2026-03-22.
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