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Weather & Climate
Custer County, Montana, United States
Overview
Climate data and monthly weather averages for Custer County.
Key Metrics
Annual Avg
8.8°C
Summer Avg
22.5°C
Winter Avg
-4°C
Record High
43.8°C
Record Low
-30.9°C
Annual Precipitation
382 mm
Avg Humidity
60%
Summer Humidity
49%
Winter Humidity
73%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 15.2° | -4.3° | -27.7° | 9.3 | 75% | 53 | 64.6 |
| Feb | 19.3° | -3.7° | -26.1° | 11.2 | 70% | 77 | 75.1 |
| Mar | 28.4° | 2.3° | -30.9° | 17.7 | 63% | 120 | 61.9 |
| Apr | 32.4° | 7.7° | -12.7° | 39.9 | 57% | 149 | 61.2 |
| May | 36.2° | 13.6° | -4.1° | 84 | 56% | 183 | 69.6 |
| Jun | 41.7° | 19.6° | 1.1° | 65.7 | 54% | 204 | 55.4 |
| Jul | 43.8° | 24.8° | 9.3° | 39.7 | 46% | 222 | 54.8 |
| Aug | 42.2° | 23.1° | 5.5° | 32.6 | 46% | 185 | 68.8 |
| Sep | 39.1° | 16.9° | -0.5° | 34.2 | 50% | 132 | 56 |
| Oct | 33.6° | 8.1° | -13.5° | 26.7 | 60% | 89 | 61 |
| Nov | 24.5° | 1.5° | -18.9° | 10.5 | 67% | 56 | 63.2 |
| Dec | 15.6° | -3.9° | -26.5° | 10.5 | 75% | 41 | 60.2 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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