Average annual temperature is 5.7 °C
Absolute maximum temperature: 32.5 °C
Absolute minimum temperature: -32.4 °C
Number of sunny days: 159 days
Number of rainy days: 145 days
Number of snow days: 61 days
Look at detailed online map of Saint Louis County
* Weather data for Saint Louis 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) | 1.4 | 6.0 | 4.8 | 22.5 | 29.2 | 30.1 | 29.2 | 28.8 | 32.5 | 27.4 | 15.0 | 7.3 |
| Average daytime temperature (°C) | -5.8 | -4.4 | -0.4 | 6.8 | 20.2 | 25.2 | 23.5 | 23.6 | 21.2 | 11.3 | 2.9 | 1.6 |
| Average temperature (°C) | -8.9 | -9.7 | -5.4 | 1.3 | 13.4 | 19.2 | 18.3 | 18.4 | 16.2 | 7.6 | -1.1 | -1.6 |
| Average night temperature (°C) | -11.5 | -14.3 | -9.6 | -3.2 | 7.4 | 14.0 | 14.0 | 14.2 | 12.7 | 4.9 | -3.9 | -3.9 |
| Absolute minimum temperature (°C) | -27.7 | -32.4 | -17.8 | -11.5 | -1.4 | 7.9 | 9.5 | 9.9 | 3.8 | -6.9 | -15.1 | -12.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 10.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 9.0 | 8.0 |
| Daylight mean duration (h) | 8.9 | 10.3 | 11.9 | 13.6 | 15.1 | 15.9 | 15.5 | 14.2 | 12.6 | 10.9 | 9.3 | 8.5 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 3.3 | 6.7 | 7.6 | 6.8 | 11.5 | 12.3 | 12.6 | 10.2 | 7.6 | 5.5 | 4.1 | 2.8 |
| Precipitation (mm) | 19 | 41 | 46 | 99 | 61 | 71 | 85 | 51 | 115 | 43 | 26 | 64 |
| Sunny days | 19 | 14 | 14 | 12 | 15 | 13 | 4 | 14 | 12 | 12 | 17 | 13 |
| Rainy days | 3 | 3 | 1 | 11 | 16 | 17 | 27 | 17 | 18 | 17 | 5 | 10 |
| Snow days | 9 | 11 | 16 | 7 | 0 | 0 | 0 | 0 | 0 | 2 | 8 | 8 |
The best time to visit Saint Louis County during the most sunny months:
Months with the longest average daylight duration in Saint Louis County:
The largest precipitation sum in Saint Louis County is at