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Weather & Climate
Custer County, Idaho, United States
Overview
Climate data and monthly weather averages for Custer County.
Key Metrics
Annual Avg
0.9°C
Summer Avg
13.4°C
Winter Avg
-10.5°C
Record High
32.5°C
Record Low
-36.1°C
Annual Precipitation
528 mm
Avg Humidity
71%
Summer Humidity
50%
Winter Humidity
91%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 2° | -10.4° | -36.1° | 55.2 | 90% | 58 | 34.6 |
| Feb | 3.6° | -10.3° | -30.1° | 48.4 | 93% | 81 | 35 |
| Mar | 12.5° | -6.3° | -26.6° | 59.8 | 89% | 127 | 33.7 |
| Apr | 19.1° | -1.7° | -20.6° | 48 | 78% | 160 | 32.4 |
| May | 24.6° | 4.6° | -11.3° | 51.1 | 67% | 189 | 36.7 |
| Jun | 29.5° | 9.8° | -6.1° | 39 | 60% | 209 | 27.3 |
| Jul | 32.5° | 15.8° | -1.9° | 18.3 | 47% | 229 | 28.4 |
| Aug | 30.6° | 14.6° | -4.2° | 19.2 | 44% | 195 | 28.2 |
| Sep | 29° | 9.4° | -8.4° | 28.8 | 50% | 146 | 31.5 |
| Oct | 23.8° | 1.8° | -20.1° | 40.3 | 64% | 99 | 31.8 |
| Nov | 14.7° | -5° | -32.5° | 47.4 | 79% | 58 | 31 |
| Dec | 6° | -10.8° | -30.5° | 72.5 | 90% | 45 | 32.1 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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