Average annual temperature is 5.6 °C
Absolute maximum temperature: 32.4 °C
Absolute minimum temperature: -27.4 °C
Number of sunny days: 218 days
Number of rainy days: 96 days
Number of snow days: 51 days
Look at detailed online map of Custer County
* Weather data for Custer 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) | 10.9 | 9.2 | 11.0 | 20.3 | 22.5 | 28.8 | 32.4 | 29.9 | 28.0 | 23.1 | 16.5 | 13.9 |
| Average daytime temperature (°C) | 1.7 | 3.7 | 5.3 | 12.2 | 18.4 | 22.7 | 29.1 | 27.1 | 23.0 | 17.2 | 9.3 | 3.8 |
| Average temperature (°C) | -5.5 | -5.3 | -2.0 | 3.3 | 9.5 | 13.7 | 19.0 | 17.8 | 13.4 | 7.3 | -0.2 | -5.0 |
| Average night temperature (°C) | -11.5 | -12.3 | -8.9 | -4.2 | 1.1 | 4.7 | 9.3 | 9.0 | 4.8 | -0.4 | -6.7 | -11.4 |
| Absolute minimum temperature (°C) | -23.8 | -27.4 | -20.1 | -13.3 | -2.8 | 0.8 | 4.5 | 5.2 | -0.8 | -10.8 | -18.7 | -23.2 |
| 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) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 9.6 |
| 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) | 7.8 | 9.3 | 10.2 | 11.4 | 11.6 | 13.1 | 13.1 | 12.3 | 10.9 | 9.8 | 8.6 | 7.9 |
| Precipitation (mm) | 20 | 26 | 30 | 36 | 95 | 28 | 12 | 16 | 33 | 8 | 20 | 25 |
| Sunny days | 19 | 18 | 15 | 19 | 9 | 11 | 18 | 18 | 21 | 25 | 25 | 20 |
| Rainy days | 1 | 0 | 7 | 5 | 22 | 19 | 13 | 13 | 9 | 4 | 2 | 1 |
| Snow days | 11 | 10 | 9 | 6 | 0 | 0 | 0 | 0 | 0 | 2 | 3 | 10 |
The largest precipitation sum in Custer County is at