Average annual temperature is 11.1 °C
Absolute maximum temperature: 33.5 °C
Absolute minimum temperature: -13.3 °C
Number of sunny days: 145 days
Number of rainy days: 203 days
Number of snow days: 17 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) | 14.7 | 19.3 | 18.3 | 27.5 | 31.8 | 33.5 | 30.9 | 30.9 | 31.7 | 26.3 | 15.9 | 14.5 |
| Average daytime temperature (°C) | 5.8 | 9.0 | 8.3 | 17.5 | 21.8 | 24.6 | 27.3 | 25.7 | 22.7 | 16.5 | 9.5 | 7.3 |
| Average temperature (°C) | 2.1 | 2.5 | 3.0 | 10.7 | 15.0 | 18.9 | 21.9 | 20.5 | 17.5 | 12.2 | 4.8 | 3.8 |
| Average night temperature (°C) | -0.7 | -2.4 | -1.2 | 4.9 | 8.5 | 13.5 | 17.2 | 16.1 | 13.3 | 8.6 | 1.0 | 1.1 |
| Absolute minimum temperature (°C) | -7.4 | -13.3 | -7.9 | -3.9 | 1.3 | 8.1 | 13.1 | 11.3 | 7.8 | -0.1 | -7.6 | -5.5 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 2.7 | 6.5 | 5.9 | 8.3 | 10.6 | 10.5 | 10.9 | 10.6 | 8.5 | 5.7 | 6.7 | 3.6 |
| Precipitation (mm) | 119 | 83 | 105 | 85 | 70 | 135 | 93 | 99 | 61 | 107 | 53 | 89 |
| Sunny days | 6 | 11 | 9 | 14 | 20 | 11 | 5 | 10 | 13 | 16 | 18 | 12 |
| Rainy days | 18 | 14 | 17 | 16 | 11 | 19 | 26 | 21 | 17 | 15 | 11 | 18 |
| Snow days | 7 | 3 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Saint Charles during the most sunny months:
The largest precipitation sum in Saint Charles is at