Average annual temperature is 14.4 °C
Absolute maximum temperature: 38.1 °C
Absolute minimum temperature: -11.6 °C
Number of sunny days: 199 days
Number of rainy days: 163 days
Number of snow days: 3 days
Look at detailed online map of Ballwin
* Weather data for Ballwin 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) | 20.1 | 19.9 | 22.3 | 28.4 | 31.2 | 34.7 | 38.1 | 37.8 | 33.1 | 29.5 | 27.1 | 17.4 |
| Average daytime temperature (°C) | 8.2 | 11.0 | 12.6 | 20.4 | 25.4 | 29.9 | 32.1 | 29.7 | 27.0 | 20.1 | 14.0 | 10.0 |
| Average temperature (°C) | 3.2 | 5.0 | 6.5 | 13.5 | 19.1 | 23.5 | 25.9 | 24.5 | 21.3 | 15.0 | 8.5 | 5.6 |
| Average night temperature (°C) | -0.2 | 0.5 | 1.9 | 8.0 | 13.6 | 17.8 | 20.8 | 20.3 | 16.5 | 10.8 | 4.2 | 2.4 |
| Absolute minimum temperature (°C) | -11.6 | -10.6 | -7.0 | 1.2 | 6.1 | 12.0 | 17.2 | 13.9 | 10.7 | -2.1 | -5.4 | -5.6 |
| 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) | 9.8 | 10.8 | 12.0 | 13.2 | 14.3 | 14.8 | 14.6 | 13.6 | 12.4 | 11.2 | 10.1 | 9.5 |
| 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) | 5.3 | 7.5 | 6.8 | 10.1 | 10.8 | 12.4 | 11.8 | 9.5 | 10.3 | 7.7 | 7.7 | 5.7 |
| Precipitation (mm) | 64 | 68 | 220 | 53 | 107 | 65 | 108 | 204 | 47 | 69 | 10 | 72 |
| Sunny days | 17 | 16 | 14 | 19 | 16 | 18 | 9 | 11 | 19 | 18 | 24 | 18 |
| Rainy days | 12 | 11 | 17 | 11 | 15 | 12 | 22 | 20 | 11 | 13 | 6 | 13 |
| Snow days | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Ballwin during the most sunny months:
The largest precipitation sum in Ballwin is at