Average annual temperature is 14.3 °C
Absolute maximum temperature: 36.9 °C
Absolute minimum temperature: -11.8 °C
Number of sunny days: 199 days
Number of rainy days: 161 days
Number of snow days: 5 days
Look at detailed online map of Bethalto
* Weather data for Bethalto 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) | 20.5 | 20.3 | 22.9 | 28.5 | 31.3 | 35.0 | 36.9 | 36.8 | 32.6 | 29.8 | 26.0 | 17.5 |
| Average daytime temperature (°C) | 8.0 | 10.9 | 12.7 | 20.3 | 25.8 | 29.7 | 31.3 | 29.5 | 26.9 | 20.1 | 13.7 | 9.6 |
| Average temperature (°C) | 3.2 | 4.8 | 6.6 | 13.5 | 19.4 | 23.5 | 25.6 | 24.5 | 21.4 | 15.1 | 8.2 | 5.4 |
| Average night temperature (°C) | 0.0 | 0.4 | 2.1 | 8.0 | 13.8 | 17.8 | 21.0 | 20.4 | 16.7 | 11.0 | 3.8 | 2.5 |
| Absolute minimum temperature (°C) | -11.8 | -11.0 | -7.8 | 0.8 | 6.2 | 11.7 | 17.3 | 13.4 | 11.1 | -1.1 | -6.1 | -5.9 |
| 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 | 10.7 | 12.0 | 13.2 | 14.3 | 14.8 | 14.6 | 13.7 | 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) | 4.9 | 7.5 | 6.8 | 10.1 | 11.2 | 12.6 | 12.2 | 10.1 | 10.3 | 7.7 | 7.6 | 5.2 |
| Precipitation (mm) | 70 | 58 | 212 | 80 | 112 | 132 | 92 | 138 | 44 | 77 | 15 | 98 |
| Sunny days | 17 | 16 | 15 | 15 | 17 | 19 | 11 | 10 | 20 | 19 | 23 | 17 |
| Rainy days | 10 | 11 | 16 | 15 | 14 | 11 | 20 | 21 | 10 | 12 | 7 | 14 |
| Snow days | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Bethalto during the most sunny months:
The largest precipitation sum in Bethalto is at