Average annual temperature is 10.1 °C
Absolute maximum temperature: 32.1 °C
Absolute minimum temperature: -20.0 °C
Number of sunny days: 153 days
Number of rainy days: 187 days
Number of snow days: 25 days
Look at detailed online map of Saint Clair County
* Weather data for Saint Clair County 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) | 11.4 | 13.6 | 14.5 | 27.2 | 29.5 | 31.8 | 31.2 | 30.8 | 32.1 | 26.5 | 15.3 | 14.8 |
| Average daytime temperature (°C) | 3.2 | 5.3 | 6.3 | 15.2 | 20.3 | 24.6 | 26.9 | 24.7 | 22.9 | 15.8 | 8.4 | 6.7 |
| Average temperature (°C) | -0.1 | -0.8 | 1.4 | 9.0 | 13.3 | 18.7 | 21.6 | 19.7 | 18.0 | 11.9 | 3.9 | 3.4 |
| Average night temperature (°C) | -2.6 | -4.9 | -2.0 | 3.8 | 7.6 | 13.6 | 17.3 | 15.7 | 14.1 | 8.8 | 0.1 | 1.2 |
| Absolute minimum temperature (°C) | -19.3 | -20.0 | -8.4 | -3.8 | 0.8 | 8.9 | 14.4 | 9.3 | 7.0 | -3.8 | -7.6 | -5.2 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.4 | 10.5 | 11.9 | 13.4 | 14.6 | 15.3 | 15.0 | 13.9 | 12.5 | 11.0 | 9.8 | 9.1 |
| Daylight minimum duration (h) | 9.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.3 | 6.8 | 6.4 | 8.2 | 11.3 | 11.8 | 11.5 | 10.4 | 8.7 | 5.8 | 6.1 | 3.6 |
| Precipitation (mm) | 57 | 75 | 104 | 107 | 34 | 61 | 129 | 114 | 53 | 83 | 38 | 71 |
| Sunny days | 10 | 13 | 8 | 11 | 23 | 16 | 5 | 12 | 14 | 9 | 19 | 13 |
| Rainy days | 14 | 10 | 14 | 19 | 8 | 14 | 26 | 19 | 16 | 22 | 8 | 17 |
| Snow days | 7 | 5 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 |
The best time to visit Saint Clair County during the most sunny months:
Months with the longest average daylight duration in Saint Clair County:
The largest precipitation sum in Saint Clair County is at