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Weather & Climate
Forsyth, Illinois, United States
Overview
Climate data and monthly weather averages for Forsyth.
Key Metrics
Annual Avg
11.3°C
Summer Avg
23.3°C
Winter Avg
-1.8°C
Record High
42°C
Record Low
-28.4°C
Annual Precipitation
1015.8 mm
Avg Humidity
77%
Summer Humidity
75%
Winter Humidity
83%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 19.1° | -3.2° | -28.4° | 57.4 | 84% | 58 | 61.7 |
| Feb | 20.5° | -1.6° | -25° | 55.2 | 82% | 75 | 67.2 |
| Mar | 26.8° | 4.9° | -20.6° | 70.1 | 79% | 114 | 63.7 |
| Apr | 28.6° | 11.7° | -6.8° | 103.5 | 75% | 148 | 61.7 |
| May | 33° | 17.4° | -1.8° | 114.7 | 77% | 172 | 58.3 |
| Jun | 41.5° | 22.3° | 3.8° | 120 | 77% | 192 | 55 |
| Jul | 42° | 24.2° | 9.4° | 99.2 | 76% | 195 | 37.8 |
| Aug | 38.2° | 23.5° | 8.6° | 84 | 73% | 174 | 39.1 |
| Sep | 39.1° | 19.7° | 2.9° | 81.9 | 71% | 140 | 55.5 |
| Oct | 32.5° | 12.4° | -5° | 93.9 | 72% | 101 | 54.8 |
| Nov | 25.8° | 5.4° | -12.8° | 71.4 | 77% | 67 | 60.9 |
| Dec | 20.9° | -0.5° | -25.9° | 64.5 | 84% | 49 | 69.8 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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