Average annual temperature is 7.0 °C
Absolute maximum temperature: 37.3 °C
Absolute minimum temperature: -28.7 °C
Number of sunny days: 226 days
Number of rainy days: 105 days
Number of snow days: 34 days
Look at detailed online map of Keystone (historical)
* Weather data for Keystone (historical) 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) | 1.9 | 4.4 | 0.1 | 17.3 | 30.3 | 34.1 | 37.3 | 33.0 | 34.3 | 29.0 | 13.8 | 12.6 |
| Average daytime temperature (°C) | -5.8 | -3.1 | -4.7 | 6.3 | 23.0 | 28.4 | 27.5 | 27.2 | 24.3 | 13.6 | 6.6 | 2.9 |
| Average temperature (°C) | -9.3 | -8.5 | -8.8 | 1.4 | 16.4 | 22.3 | 21.1 | 21.4 | 18.2 | 8.5 | 1.3 | -1.3 |
| Average night temperature (°C) | -12.5 | -13.1 | -12.2 | -2.6 | 10.1 | 16.5 | 15.6 | 16.8 | 13.3 | 4.5 | -2.7 | -4.2 |
| Absolute minimum temperature (°C) | -26.9 | -28.7 | -19.8 | -12.2 | 0.3 | 10.0 | 10.3 | 12.9 | 7.2 | -8.2 | -12.6 | -10.1 |
| 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 | 8.0 |
| Daylight mean duration (h) | 9.1 | 10.3 | 11.9 | 13.6 | 15.0 | 15.7 | 15.4 | 14.1 | 12.6 | 10.9 | 9.5 | 8.7 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 3.7 | 7.5 | 7.6 | 9.3 | 11.9 | 12.3 | 13.1 | 10.9 | 9.1 | 8.0 | 6.9 | 4.9 |
| Precipitation (mm) | 18 | 16 | 51 | 55 | 50 | 80 | 56 | 96 | 54 | 19 | 4 | 50 |
| Sunny days | 24 | 21 | 15 | 15 | 19 | 15 | 18 | 19 | 15 | 18 | 26 | 21 |
| Rainy days | 2 | 1 | 1 | 12 | 12 | 15 | 13 | 12 | 15 | 11 | 3 | 8 |
| Snow days | 5 | 6 | 15 | 3 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 2 |
The best time to visit Keystone (historical) during the most sunny months:
Months with the longest average daylight duration in Keystone (historical):
The largest precipitation sum in Keystone (historical) is at