Average annual temperature is 9.4 °C
Absolute maximum temperature: 30.5 °C
Absolute minimum temperature: -21.9 °C
Number of sunny days: 114 days
Number of rainy days: 213 days
Number of snow days: 38 days
Look at detailed online map of Great Valley
* Weather data for Great Valley 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) | 13.0 | 16.6 | 14.8 | 27.0 | 29.3 | 30.4 | 30.5 | 29.5 | 29.7 | 26.6 | 15.4 | 13.3 |
| Average daytime temperature (°C) | 3.6 | 6.2 | 5.6 | 15.9 | 19.4 | 22.8 | 25.7 | 23.6 | 21.5 | 15.0 | 7.4 | 6.0 |
| Average temperature (°C) | 0.1 | -0.3 | 0.5 | 8.9 | 12.7 | 17.3 | 20.5 | 18.7 | 16.3 | 11.0 | 3.3 | 2.5 |
| Average night temperature (°C) | -2.7 | -4.9 | -3.3 | 3.6 | 6.8 | 12.6 | 16.1 | 15.0 | 12.3 | 7.7 | 0.2 | 0.0 |
| Absolute minimum temperature (°C) | -11.2 | -21.9 | -11.3 | -6.3 | -0.5 | 8.3 | 12.4 | 10.4 | 7.6 | -0.7 | -9.1 | -6.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.5 | 10.6 | 11.9 | 13.4 | 14.6 | 15.2 | 14.9 | 13.9 | 12.5 | 11.1 | 9.8 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 2.0 | 5.5 | 5.3 | 8.1 | 11.1 | 10.6 | 11.2 | 9.7 | 8.4 | 5.3 | 5.4 | 3.2 |
| Precipitation (mm) | 137 | 80 | 121 | 104 | 51 | 110 | 93 | 120 | 38 | 82 | 72 | 97 |
| Sunny days | 5 | 6 | 4 | 12 | 20 | 9 | 8 | 5 | 14 | 13 | 8 | 10 |
| Rainy days | 14 | 15 | 16 | 17 | 11 | 21 | 23 | 26 | 16 | 18 | 19 | 17 |
| Snow days | 12 | 7 | 11 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 4 |
The best time to visit Great Valley during the most sunny months:
The largest precipitation sum in Great Valley is at