Average annual temperature is 17.1 °C
Absolute maximum temperature: 38.1 °C
Absolute minimum temperature: -5.2 °C
Number of sunny days: 185 days
Number of rainy days: 180 days
Look at detailed online map of Chester County
* Weather data for Chester 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) | 21.5 | 24.9 | 26.0 | 28.9 | 31.6 | 36.8 | 35.8 | 38.1 | 33.7 | 31.8 | 26.8 | 19.7 |
| Average daytime temperature (°C) | 13.4 | 16.1 | 17.5 | 21.5 | 26.8 | 31.8 | 32.7 | 32.2 | 29.9 | 24.5 | 17.2 | 13.8 |
| Average temperature (°C) | 8.5 | 10.0 | 11.6 | 15.2 | 20.6 | 24.7 | 26.7 | 26.3 | 23.3 | 18.3 | 11.3 | 8.1 |
| Average night temperature (°C) | 4.7 | 5.8 | 6.9 | 10.1 | 15.2 | 18.8 | 21.8 | 21.7 | 17.9 | 13.4 | 6.6 | 4.0 |
| Absolute minimum temperature (°C) | -3.5 | -4.8 | -5.2 | 3.2 | 7.3 | 14.0 | 16.7 | 16.2 | 13.8 | 0.0 | -2.0 | -3.4 |
| 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 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.5 | 6.0 | 7.9 | 8.5 | 11.0 | 12.1 | 10.9 | 9.9 | 10.7 | 8.4 | 7.5 | 6.9 |
| Precipitation (mm) | 155 | 105 | 158 | 155 | 110 | 47 | 158 | 122 | 29 | 24 | 56 | 68 |
| Sunny days | 14 | 14 | 16 | 13 | 12 | 14 | 11 | 15 | 15 | 20 | 22 | 19 |
| Rainy days | 17 | 14 | 15 | 17 | 19 | 16 | 20 | 16 | 15 | 11 | 8 | 12 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Chester County during the most sunny months:
The largest precipitation sum in Chester County is at