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Weather & Climate
Lewis County, Idaho, United States
Overview
Climate data and monthly weather averages for Lewis County.
Key Metrics
Annual Avg
7.5°C
Summer Avg
18.3°C
Winter Avg
-2.6°C
Record High
38.2°C
Record Low
-29°C
Annual Precipitation
737.5 mm
Avg Humidity
71%
Summer Humidity
57%
Winter Humidity
88%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 11.8° | -3° | -29° | 80.3 | 90% | 40 | 37.1 |
| Feb | 13.9° | -1.6° | -27.7° | 70.3 | 85% | 62 | 37.6 |
| Mar | 23° | 2.2° | -18.9° | 89.3 | 78% | 102 | 30.6 |
| Apr | 27.7° | 5.8° | -8.3° | 73.8 | 71% | 144 | 33.6 |
| May | 32.2° | 11° | -4.3° | 75.6 | 68% | 187 | 39 |
| Jun | 36.5° | 14.9° | 0.6° | 63.9 | 65% | 203 | 36.7 |
| Jul | 38.2° | 20.4° | 5.2° | 14.9 | 54% | 233 | 26.9 |
| Aug | 36.4° | 19.6° | 3.7° | 20.5 | 52% | 192 | 28.7 |
| Sep | 34.2° | 14.8° | -2.7° | 29.1 | 56% | 136 | 29.9 |
| Oct | 29.5° | 7.6° | -12.2° | 57.4 | 67% | 87 | 32.9 |
| Nov | 20.1° | 1.3° | -18.5° | 75.3 | 79% | 44 | 40 |
| Dec | 11.9° | -3.2° | -24.5° | 87.1 | 88% | 31 | 37.6 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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