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Weather & Climate
Washington County, Idaho, United States
Overview
Available climate summaries for Washington County. Origins and reference periods are unverified; stored values may include AI estimates. Treat these as estimates until independently verified.
Key Metrics
Annual Avg
9.1°C
Summer Avg
21.3°C
Winter Avg
-2.8°C
Record High
40.8°C
Record Low
-26.5°C
Annual Precipitation
521.7 mm
Avg Humidity
62%
Summer Humidity
44%
Winter Humidity
84%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 8.9° | -3.8° | -26.5° | 67.6 | 88% | 48 | 42.9 |
| Feb | 13.9° | -1.2° | -20.3° | 49 | 79% | 70 | 40.6 |
| Mar | 22.2° | 3.7° | -14.3° | 66 | 70% | 112 | 39.9 |
| Apr | 28.1° | 7.7° | -5.7° | 44.1 | 61% | 158 | 42 |
| May | 34.2° | 13.3° | -3° | 47.1 | 56% | 201 | 40.8 |
| Jun | 40.6° | 17.8° | 0.7° | 33 | 52% | 218 | 40.5 |
| Jul | 40.8° | 23.6° | 6.3° | 8.1 | 42% | 242 | 35.5 |
| Aug | 38.7° | 22.5° | 5.5° | 9.6 | 39% | 206 | 37.4 |
| Sep | 36.4° | 17.1° | -0.1° | 18.3 | 43% | 151 | 46.3 |
| Oct | 30.6° | 9.4° | -8.7° | 34.7 | 55% | 100 | 39.1 |
| Nov | 19.6° | 2° | -17.1° | 54.3 | 70% | 55 | 38 |
| Dec | 10.5° | -3.3° | -25.3° | 89.9 | 85% | 38 | 45.4 |
Data sources
Estimates and unverified origins
Oyster List climate data - Climate origins are unverified. Available methods include historical APIs and AI estimates; stored rows do not identify the original dataset, reference period, or model for each value. Treat these summaries as estimates until independently verified. Record updated 2026-03-22.
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