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Weather & Climate
Effingham, Illinois, United States
Overview
Climate data and monthly weather averages for Effingham.
Key Metrics
Annual Avg
12.3°C
Summer Avg
24°C
Winter Avg
-0.4°C
Record High
42.8°C
Record Low
-25.2°C
Annual Precipitation
1117.5 mm
Avg Humidity
77%
Summer Humidity
76%
Winter Humidity
83%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 20.2° | -1.8° | -25.2° | 68.5 | 83% | 58 | 62.1 |
| Feb | 21.7° | -0.2° | -23° | 63.8 | 82% | 75 | 63.3 |
| Mar | 26.4° | 6.2° | -15.3° | 89.6 | 79% | 114 | 61.5 |
| Apr | 29.4° | 12.7° | -6.3° | 116.4 | 76% | 148 | 59.1 |
| May | 32° | 18.2° | -0.1° | 122.8 | 79% | 172 | 59.4 |
| Jun | 40.6° | 23° | 3.6° | 121.8 | 78% | 192 | 54.4 |
| Jul | 42.8° | 24.9° | 9.8° | 102.6 | 76% | 195 | 35.5 |
| Aug | 39.9° | 24.1° | 9.6° | 88.4 | 73% | 174 | 43.3 |
| Sep | 36.5° | 20.4° | 3.1° | 76.5 | 71% | 140 | 57.7 |
| Oct | 33.1° | 13.3° | -4° | 102.3 | 72% | 101 | 53.3 |
| Nov | 26.4° | 6.3° | -12.9° | 86.1 | 77% | 67 | 56.1 |
| Dec | 21.2° | 0.8° | -18.1° | 78.7 | 83% | 49 | 68.1 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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