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Weather & Climate
Mattoon, Illinois, United States
Overview
Climate data and monthly weather averages for Mattoon.
Key Metrics
Annual Avg
11.9°C
Summer Avg
23.9°C
Winter Avg
-1.1°C
Record High
42.5°C
Record Low
-26.6°C
Annual Precipitation
1086 mm
Avg Humidity
77%
Summer Humidity
74%
Winter Humidity
84%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 19.6° | -2.5° | -26.6° | 66.6 | 84% | 58 | 64.3 |
| Feb | 21.7° | -0.9° | -25.4° | 61.9 | 83% | 75 | 62.8 |
| Mar | 26.4° | 5.5° | -16.5° | 80.3 | 79% | 114 | 62.7 |
| Apr | 29.1° | 12.2° | -6.3° | 114.6 | 76% | 148 | 61.7 |
| May | 32.6° | 17.8° | -1.2° | 120 | 78% | 172 | 57.9 |
| Jun | 41.5° | 22.8° | 2.6° | 123.9 | 76% | 192 | 53.1 |
| Jul | 42.5° | 24.7° | 9.5° | 106.6 | 74% | 195 | 38.3 |
| Aug | 39.6° | 24.1° | 9.3° | 80.3 | 71% | 174 | 40.2 |
| Sep | 38° | 20.3° | 3.5° | 73.8 | 69% | 140 | 57.6 |
| Oct | 33.2° | 12.8° | -4.1° | 99.8 | 72% | 101 | 54.8 |
| Nov | 25.7° | 5.7° | -14° | 81.6 | 78% | 67 | 56.7 |
| Dec | 20.9° | 0.1° | -18.5° | 76.6 | 84% | 49 | 66 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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