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Weather & Climate
Custer County, South Dakota, United States
Overview
Climate data and monthly weather averages for Custer County.
Key Metrics
Annual Avg
8.8°C
Summer Avg
22.1°C
Winter Avg
-3.3°C
Record High
42°C
Record Low
-25.2°C
Annual Precipitation
435.9 mm
Avg Humidity
59%
Summer Humidity
50%
Winter Humidity
69%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 17° | -3.4° | -23.5° | 9 | 70% | 65 | 58.1 |
| Feb | 20.7° | -3° | -24.2° | 13.7 | 66% | 83 | 62.6 |
| Mar | 26.2° | 2.6° | -23° | 24.5 | 60% | 127 | 61.9 |
| Apr | 30.8° | 7.2° | -13.3° | 50.4 | 58% | 153 | 67.6 |
| May | 35° | 12.8° | -6.8° | 81.2 | 58% | 187 | 58.5 |
| Jun | 41.2° | 19.5° | 2.5° | 66.3 | 54% | 210 | 54.2 |
| Jul | 42° | 24.4° | 8° | 56.4 | 48% | 219 | 44 |
| Aug | 40.2° | 22.5° | 4.3° | 44.9 | 48% | 189 | 53.6 |
| Sep | 38.3° | 16.9° | -2.3° | 36.6 | 50% | 145 | 49.8 |
| Oct | 31.8° | 7.9° | -16.4° | 30.4 | 59% | 101 | 58.8 |
| Nov | 24.5° | 1.7° | -19.1° | 11.7 | 63% | 68 | 66.1 |
| Dec | 17.9° | -3.5° | -25.2° | 10.8 | 70% | 54 | 55.5 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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