Average annual temperature is 12.1 °C
Absolute maximum temperature: 39.6 °C
Absolute minimum temperature: -23.0 °C
Number of sunny days: 241 days
Number of rainy days: 98 days
Number of snow days: 26 days
Look at detailed online map of Saint Charles
* Weather data for Saint Charles 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) | 15.9 | 16.5 | 22.2 | 30.1 | 29.7 | 36.8 | 39.6 | 37.7 | 37.4 | 29.6 | 23.3 | 19.0 |
| Average daytime temperature (°C) | 5.9 | 10.1 | 13.5 | 19.8 | 23.5 | 26.9 | 33.9 | 33.0 | 29.0 | 21.5 | 15.1 | 8.8 |
| Average temperature (°C) | -0.5 | 0.7 | 4.4 | 10.7 | 16.0 | 19.5 | 25.7 | 25.2 | 20.9 | 13.2 | 6.7 | 1.9 |
| Average night temperature (°C) | -5.5 | -5.7 | -2.5 | 3.4 | 9.9 | 13.1 | 18.4 | 18.5 | 14.2 | 6.8 | 1.3 | -2.7 |
| Absolute minimum temperature (°C) | -19.8 | -23.0 | -7.3 | -3.9 | 5.6 | 9.6 | 14.2 | 14.4 | 9.3 | -11.2 | -10.0 | -9.6 |
| 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) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 9.6 |
| 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) | 7.2 | 8.9 | 10.2 | 10.6 | 11.4 | 12.1 | 12.5 | 12.0 | 10.9 | 9.9 | 8.2 | 7.4 |
| Precipitation (mm) | 10 | 15 | 11 | 65 | 101 | 91 | 19 | 42 | 44 | 3 | 4 | 24 |
| Sunny days | 22 | 21 | 23 | 18 | 12 | 11 | 16 | 17 | 25 | 29 | 24 | 23 |
| Rainy days | 2 | 2 | 3 | 9 | 19 | 19 | 15 | 14 | 5 | 2 | 5 | 3 |
| Snow days | 7 | 5 | 5 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 5 |
The largest precipitation sum in Saint Charles is at