Average annual temperature is 11.8 °C
Absolute maximum temperature: 32.6 °C
Absolute minimum temperature: -21.7 °C
Number of sunny days: 165 days
Number of rainy days: 197 days
Number of snow days: 3 days
Look at detailed online map of Alton
* Weather data for Alton 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) | 17.1 | 19.8 | 14.3 | 31.5 | 28.3 | 28.1 | 32.3 | 29.9 | 32.6 | 27.8 | 17.5 | 16.1 |
| Average daytime temperature (°C) | 7.7 | 6.7 | 9.1 | 16.2 | 20.2 | 23.4 | 28.1 | 25.9 | 23.0 | 19.0 | 10.5 | 8.9 |
| Average temperature (°C) | 3.7 | 2.2 | 4.2 | 10.8 | 14.4 | 18.1 | 23.3 | 21.3 | 18.7 | 14.1 | 5.6 | 4.8 |
| Average night temperature (°C) | 0.3 | -2.3 | 0.1 | 6.3 | 9.0 | 13.8 | 19.5 | 17.5 | 15.5 | 10.4 | 1.4 | 1.4 |
| Absolute minimum temperature (°C) | -5.3 | -21.7 | -3.8 | -1.9 | 2.8 | 7.2 | 14.9 | 13.8 | 9.3 | 5.3 | -4.9 | -6.6 |
| 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 | 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 | 9.2 |
| 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) | 4.1 | 6.6 | 7.5 | 8.8 | 11.9 | 10.4 | 10.9 | 10.1 | 7.4 | 8.0 | 7.2 | 5.5 |
| Precipitation (mm) | 164 | 56 | 116 | 107 | 84 | 88 | 175 | 127 | 216 | 65 | 38 | 176 |
| Sunny days | 8 | 13 | 16 | 16 | 22 | 8 | 10 | 8 | 11 | 13 | 23 | 17 |
| Rainy days | 21 | 14 | 15 | 14 | 9 | 22 | 21 | 23 | 19 | 18 | 7 | 14 |
| Snow days | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Alton during the most sunny months:
The largest precipitation sum in Alton is at