Average annual temperature is 16.4 °C
Absolute maximum temperature: 39.7 °C
Absolute minimum temperature: -14.5 °C
Number of sunny days: 233 days
Number of rainy days: 132 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) | 20.9 | 23.8 | 26.3 | 31.5 | 31.7 | 37.6 | 37.4 | 39.7 | 39.4 | 31.0 | 25.3 | 19.6 |
| Average daytime temperature (°C) | 11.8 | 13.1 | 16.7 | 22.7 | 25.7 | 30.1 | 33.7 | 35.5 | 31.7 | 23.0 | 16.0 | 12.3 |
| Average temperature (°C) | 5.3 | 5.7 | 9.5 | 15.2 | 20.0 | 24.1 | 27.6 | 29.2 | 25.4 | 17.1 | 9.9 | 6.9 |
| Average night temperature (°C) | 0.4 | 0.8 | 4.1 | 9.0 | 15.3 | 19.1 | 22.5 | 23.1 | 20.2 | 12.2 | 5.3 | 2.8 |
| Absolute minimum temperature (°C) | -14.5 | -8.8 | -6.0 | 1.4 | 6.2 | 15.2 | 18.0 | 17.1 | 14.4 | -1.6 | -4.7 | -3.8 |
| 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 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.5 | 7.8 | 9.1 | 10.2 | 10.4 | 11.7 | 12.0 | 12.3 | 10.4 | 9.0 | 7.7 | 7.0 |
| Precipitation (mm) | 15 | 20 | 8 | 50 | 71 | 145 | 72 | 12 | 37 | 53 | 27 | 72 |
| Sunny days | 26 | 18 | 23 | 21 | 9 | 8 | 17 | 24 | 20 | 22 | 24 | 21 |
| Rainy days | 5 | 10 | 8 | 9 | 22 | 22 | 14 | 7 | 10 | 9 | 6 | 10 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Custer County during the most sunny months:
The largest precipitation sum in Custer County is at