Average annual temperature is 12.5 °C
Absolute maximum temperature: 35.3 °C
Absolute minimum temperature: -14.9 °C
Number of sunny days: 178 days
Number of rainy days: 182 days
Number of snow days: 5 days
Look at detailed online map of Charlestown
* Weather data for Charlestown 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) | 18.3 | 18.2 | 16.3 | 31.6 | 29.0 | 35.3 | 33.2 | 30.9 | 34.0 | 27.9 | 19.6 | 15.2 |
| Average daytime temperature (°C) | 7.9 | 8.4 | 10.1 | 18.8 | 22.7 | 26.5 | 29.8 | 27.4 | 24.1 | 19.2 | 10.7 | 8.4 |
| Average temperature (°C) | 4.1 | 3.1 | 4.6 | 12.4 | 15.7 | 20.0 | 24.1 | 22.2 | 19.3 | 14.1 | 5.8 | 4.5 |
| Average night temperature (°C) | 0.9 | -1.2 | 0.1 | 7.2 | 9.1 | 14.7 | 19.6 | 18.0 | 15.3 | 10.0 | 1.8 | 1.4 |
| Absolute minimum temperature (°C) | -3.8 | -14.9 | -4.9 | -0.8 | 4.0 | 9.8 | 15.6 | 13.9 | 9.6 | 4.3 | -4.9 | -4.7 |
| 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 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 4.5 | 7.2 | 7.3 | 8.8 | 11.8 | 10.8 | 11.8 | 10.0 | 8.2 | 8.0 | 7.5 | 4.8 |
| Precipitation (mm) | 126 | 39 | 82 | 111 | 52 | 76 | 163 | 80 | 127 | 61 | 72 | 187 |
| Sunny days | 13 | 17 | 14 | 15 | 21 | 13 | 9 | 11 | 15 | 18 | 18 | 14 |
| Rainy days | 18 | 9 | 17 | 15 | 10 | 17 | 22 | 20 | 15 | 13 | 11 | 15 |
| Snow days | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The best time to visit Charlestown during the most sunny months:
The largest precipitation sum in Charlestown is at