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Weather & Climate
Jefferson County, Idaho, United States
Overview
Climate data and monthly weather averages for Jefferson County.
Key Metrics
Annual Avg
6.3°C
Summer Avg
19.8°C
Winter Avg
-7.2°C
Record High
38.7°C
Record Low
-32°C
Annual Precipitation
448.1 mm
Avg Humidity
62%
Summer Humidity
44%
Winter Humidity
86%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 9.9° | -8.3° | -31.9° | 37.8 | 89% | 55 | 44.8 |
| Feb | 11° | -5.8° | -26.7° | 33.6 | 83% | 76 | 46.8 |
| Mar | 20° | 0.8° | -20° | 41.5 | 69% | 127 | 53.4 |
| Apr | 26.4° | 5.4° | -8.9° | 46.8 | 60% | 164 | 48.2 |
| May | 34.1° | 11.1° | -5.1° | 52.1 | 56% | 206 | 51.6 |
| Jun | 36.2° | 16.5° | -1.3° | 43.8 | 50% | 225 | 44.5 |
| Jul | 38.7° | 22.3° | 4.3° | 21.7 | 42% | 237 | 48.1 |
| Aug | 37° | 20.6° | 2.3° | 24.5 | 40% | 204 | 44.5 |
| Sep | 34.7° | 14.8° | -3.6° | 32.7 | 46% | 154 | 58 |
| Oct | 28.2° | 6.6° | -13.4° | 37.5 | 57% | 107 | 47.4 |
| Nov | 18.2° | -0.8° | -27.6° | 33.6 | 71% | 63 | 44.7 |
| Dec | 8.7° | -7.4° | -32° | 42.5 | 85% | 43 | 47.5 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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