Average annual temperature is 9.4 °C
Absolute maximum temperature: 38.8 °C
Absolute minimum temperature: -29.5 °C
Number of sunny days: 228 days
Number of rainy days: 102 days
Number of snow days: 35 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) | 7.1 | 12.2 | 10.6 | 29.7 | 30.8 | 31.5 | 38.8 | 36.9 | 35.4 | 24.5 | 14.9 | 14.3 |
| Average daytime temperature (°C) | 1.1 | 2.1 | 3.0 | 14.1 | 23.8 | 26.0 | 30.7 | 30.9 | 26.2 | 13.7 | 9.6 | 6.3 |
| Average temperature (°C) | -3.7 | -3.9 | -2.8 | 6.5 | 16.8 | 19.8 | 23.7 | 23.6 | 19.1 | 7.8 | 3.8 | 0.8 |
| Average night temperature (°C) | -7.3 | -8.4 | -6.7 | 1.1 | 10.8 | 14.4 | 17.2 | 17.5 | 13.6 | 3.3 | -0.2 | -2.5 |
| Absolute minimum temperature (°C) | -22.6 | -29.5 | -12.0 | -8.3 | 4.2 | 9.9 | 8.9 | 12.7 | 10.2 | -13.8 | -9.2 | -7.5 |
| 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 | 10.4 | 11.9 | 13.6 | 15.0 | 15.7 | 15.3 | 14.1 | 12.5 | 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) | 5.6 | 7.3 | 8.4 | 9.5 | 11.0 | 12.1 | 13.6 | 11.3 | 10.8 | 7.4 | 7.6 | 6.2 |
| Precipitation (mm) | 11 | 28 | 17 | 26 | 55 | 87 | 13 | 51 | 47 | 44 | 6 | 16 |
| Sunny days | 23 | 18 | 19 | 18 | 12 | 12 | 25 | 21 | 17 | 16 | 23 | 24 |
| Rainy days | 1 | 5 | 3 | 7 | 19 | 18 | 6 | 10 | 13 | 12 | 3 | 5 |
| Snow days | 7 | 5 | 9 | 5 | 0 | 0 | 0 | 0 | 0 | 3 | 4 | 2 |
The best time to visit Custer County during the most sunny months:
Months with the longest average daylight duration in Custer County:
The largest precipitation sum in Custer County is at