Unlock deeper multi-jurisdiction research
Full sub-pages, saves, and alerts are available on paid plans.
Weather & Climate
Chelan County, Washington, United States
Overview
Climate data and monthly weather averages for Chelan County.
Key Metrics
Annual Avg
3.2°C
Summer Avg
13.1°C
Winter Avg
-5.8°C
Record High
33°C
Record Low
-28.4°C
Annual Precipitation
1036.9 mm
Avg Humidity
83%
Summer Humidity
70%
Winter Humidity
95%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 7.1° | -5.7° | -28.4° | 150 | 95% | 36 | 27.7 |
| Feb | 9.2° | -5.4° | -26.9° | 94.6 | 95% | 59 | 22.5 |
| Mar | 14.6° | -2.7° | -24.4° | 113.5 | 93% | 97 | 21.1 |
| Apr | 20.4° | 0.5° | -14.9° | 66.6 | 86% | 137 | 25.7 |
| May | 26.6° | 6.7° | -8.3° | 60.8 | 76% | 175 | 22.9 |
| Jun | 31.9° | 10.6° | -2.4° | 42.9 | 73% | 190 | 18.7 |
| Jul | 30.6° | 14.5° | -0.2° | 19.5 | 69% | 218 | 20 |
| Aug | 33° | 14.3° | 0.9° | 22.9 | 68% | 184 | 16.8 |
| Sep | 29.4° | 10.2° | -4.2° | 43.8 | 71% | 128 | 20.6 |
| Oct | 23.5° | 3.9° | -17.2° | 109.1 | 80% | 79 | 23.4 |
| Nov | 11.7° | -2.1° | -24.2° | 155.7 | 91% | 40 | 24.3 |
| Dec | 5.4° | -6.4° | -27.1° | 157.5 | 95% | 28 | 32 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
Subscribe to unlock the full sub-page depth for additional jurisdictions.
You can keep discovering Oyster publicly, but full multi-jurisdiction depth, tracking, alerts, and exports are part of paid access.