Average annual temperature is 4.9 °C
Absolute maximum temperature: 35.0 °C
Absolute minimum temperature: -23.0 °C
Number of sunny days: 179 days
Number of rainy days: 103 days
Number of snow days: 83 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) | 2.0 | 3.8 | 5.0 | 15.9 | 23.7 | 27.4 | 35.0 | 33.6 | 26.7 | 22.1 | 12.6 | 7.2 |
| Average daytime temperature (°C) | -4.0 | -1.2 | -1.7 | 5.1 | 17.0 | 19.2 | 29.9 | 26.8 | 21.2 | 14.3 | 6.8 | 0.7 |
| Average temperature (°C) | -8.3 | -6.8 | -5.9 | 0.8 | 10.1 | 13.0 | 21.0 | 18.9 | 13.2 | 6.9 | 0.1 | -4.7 |
| Average night temperature (°C) | -11.5 | -11.0 | -9.4 | -2.9 | 3.3 | 6.6 | 11.6 | 11.7 | 6.3 | 1.3 | -4.7 | -9.5 |
| Absolute minimum temperature (°C) | -23.0 | -17.8 | -16.7 | -9.8 | -2.3 | 0.0 | 7.5 | 4.4 | -0.1 | -10.8 | -13.4 | -21.6 |
| 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) | 9.3 | 10.5 | 11.9 | 13.5 | 14.8 | 15.5 | 15.1 | 14.0 | 12.5 | 11.0 | 9.6 | 8.9 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 6.2 | 8.0 | 7.9 | 10.6 | 12.6 | 12.1 | 13.5 | 11.5 | 10.7 | 8.3 | 6.8 | 5.9 |
| Precipitation (mm) | 23 | 16 | 76 | 32 | 36 | 52 | 8 | 40 | 21 | 28 | 23 | 35 |
| Sunny days | 16 | 13 | 6 | 13 | 11 | 4 | 22 | 17 | 17 | 20 | 20 | 20 |
| Rainy days | 0 | 0 | 2 | 2 | 20 | 26 | 9 | 14 | 13 | 9 | 5 | 3 |
| Snow days | 15 | 15 | 23 | 15 | 0 | 0 | 0 | 0 | 0 | 2 | 5 | 8 |
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