Average annual temperature is 13.4 °C
Absolute maximum temperature: 36.3 °C
Absolute minimum temperature: -12.5 °C
Number of sunny days: 193 days
Number of rainy days: 165 days
Number of snow days: 7 days
Look at detailed online map of Mattoon
* Weather data for Mattoon United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 18.7 | 19.3 | 21.0 | 27.5 | 31.1 | 33.7 | 35.0 | 36.3 | 32.0 | 29.3 | 25.0 | 16.1 |
| Average daytime temperature (°C) | 6.6 | 10.0 | 11.3 | 19.1 | 24.8 | 28.9 | 29.8 | 28.4 | 26.2 | 19.3 | 13.0 | 9.0 |
| Average temperature (°C) | 2.3 | 3.9 | 5.6 | 12.2 | 18.6 | 22.8 | 24.6 | 23.4 | 20.7 | 14.3 | 7.3 | 4.6 |
| Average night temperature (°C) | -0.7 | -0.5 | 1.2 | 6.7 | 12.6 | 17.1 | 19.8 | 19.1 | 15.8 | 10.3 | 2.9 | 1.8 |
| Absolute minimum temperature (°C) | -12.4 | -12.5 | -8.3 | -1.5 | 4.0 | 10.6 | 15.7 | 12.6 | 10.9 | -2.8 | -8.5 | -7.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 12.0 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 12.5 | 11.2 | 10.0 | 9.4 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.2 | 7.4 | 6.6 | 9.4 | 11.1 | 12.1 | 12.2 | 10.3 | 10.2 | 7.2 | 7.8 | 5.0 |
| Precipitation (mm) | 83 | 64 | 130 | 78 | 38 | 64 | 97 | 91 | 55 | 59 | 20 | 72 |
| Sunny days | 12 | 16 | 13 | 15 | 20 | 17 | 12 | 13 | 20 | 18 | 22 | 15 |
| Rainy days | 13 | 12 | 17 | 15 | 11 | 13 | 19 | 18 | 10 | 13 | 8 | 16 |
| Snow days | 6 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Mattoon during the most sunny months:
The largest precipitation sum in Mattoon is at