Average annual temperature is 0.6 °C
Absolute maximum temperature: 26.6 °C
Absolute minimum temperature: -29.2 °C
Number of sunny days: 124 days
Number of rainy days: 134 days
Number of snow days: 107 days
Look at detailed online map of Keystone
* Weather data for Keystone 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) | 4.4 | 7.1 | 6.9 | 13.8 | 16.7 | 21.7 | 26.6 | 26.0 | 23.7 | 17.1 | 9.6 | 8.9 |
| Average daytime temperature (°C) | -3.4 | -1.7 | -0.4 | 5.3 | 12.1 | 15.7 | 23.1 | 22.0 | 18.3 | 10.7 | 3.8 | 0.3 |
| Average temperature (°C) | -8.7 | -9.5 | -7.2 | -2.1 | 4.8 | 7.4 | 13.8 | 13.2 | 9.0 | 2.4 | -7.6 | -9.7 |
| Average night temperature (°C) | -13.1 | -15.7 | -13.1 | -8.6 | -2.1 | -1.0 | 4.3 | 5.3 | 1.1 | -4.1 | -17.0 | -17.6 |
| Absolute minimum temperature (°C) | -19.4 | -22.7 | -22.3 | -17.8 | -6.1 | -3.7 | -0.5 | 2.9 | -3.2 | -19.8 | -29.2 | -27.2 |
| 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) | 9.7 | 10.7 | 12.0 | 13.3 | 14.4 | 14.9 | 14.7 | 13.7 | 12.5 | 11.2 | 10.0 | 9.4 |
| 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) | 6.0 | 8.2 | 9.0 | 10.8 | 11.8 | 12.3 | 13.3 | 12.0 | 10.9 | 9.4 | 7.8 | 6.3 |
| Precipitation (mm) | 61 | 33 | 69 | 61 | 43 | 40 | 53 | 81 | 39 | 56 | 19 | 64 |
| Sunny days | 6 | 13 | 9 | 10 | 3 | 9 | 5 | 6 | 15 | 14 | 19 | 15 |
| Rainy days | 2 | 2 | 2 | 1 | 26 | 21 | 26 | 25 | 15 | 12 | 1 | 1 |
| Snow days | 23 | 13 | 20 | 19 | 2 | 0 | 0 | 0 | 0 | 5 | 10 | 15 |
The best time to visit Keystone during the most sunny months:
The largest precipitation sum in Keystone is at