Average annual temperature is 21.9 °C
Absolute maximum temperature: 41.3 °C
Absolute minimum temperature: 1.0 °C
Number of sunny days: 143 days
Number of rainy days: 222 days
Look at detailed online map of Illinois Plant
* Weather data for Illinois Plant 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) | 23.9 | 26.9 | 28.9 | 29.3 | 32.8 | 35.4 | 37.6 | 41.3 | 37.0 | 34.3 | 29.0 | 25.7 |
| Average daytime temperature (°C) | 19.4 | 20.3 | 23.5 | 24.7 | 29.5 | 33.1 | 33.7 | 36.9 | 33.7 | 27.6 | 21.4 | 18.6 |
| Average temperature (°C) | 14.7 | 15.2 | 18.7 | 19.9 | 24.5 | 28.3 | 29.3 | 31.3 | 28.1 | 22.3 | 16.2 | 13.3 |
| Average night temperature (°C) | 11.1 | 11.5 | 14.8 | 15.9 | 20.1 | 24.4 | 25.7 | 27.2 | 23.6 | 18.2 | 12.4 | 9.4 |
| Absolute minimum temperature (°C) | 1.6 | 1.5 | 1.0 | 8.8 | 13.9 | 20.3 | 22.5 | 23.4 | 20.1 | 8.7 | 4.5 | 1.4 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.5 | 11.1 | 12.0 | 12.9 | 13.7 | 14.0 | 13.9 | 13.2 | 12.3 | 11.4 | 10.7 | 10.2 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 6.5 | 7.8 | 8.6 | 9.1 | 10.4 | 11.3 | 12.3 | 12.0 | 10.8 | 8.6 | 6.8 | 7.7 |
| Precipitation (mm) | 183 | 202 | 99 | 99 | 138 | 61 | 103 | 16 | 31 | 21 | 80 | 128 |
| Sunny days | 11 | 9 | 10 | 10 | 11 | 6 | 2 | 17 | 13 | 18 | 16 | 20 |
| Rainy days | 20 | 19 | 21 | 20 | 20 | 24 | 29 | 14 | 17 | 13 | 14 | 11 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Illinois Plant during the most sunny months:
The largest precipitation sum in Illinois Plant is at