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Weather & Climate
Umatilla County, Oregon, United States
Overview
Available climate summaries for Umatilla County. Origins and reference periods are unverified; stored values may include AI estimates. Treat these as estimates until independently verified.
Key Metrics
Annual Avg
9.5°C
Summer Avg
19.5°C
Winter Avg
0.4°C
Record High
39.2°C
Record Low
-22.8°C
Annual Precipitation
519.2 mm
Avg Humidity
64%
Summer Humidity
51%
Winter Humidity
79%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 17.1° | 0.1° | -22.8° | 59.8 | 81% | 42 | 56.2 |
| Feb | 17° | 1.3° | -15° | 48.2 | 76% | 65 | 52.1 |
| Mar | 24.2° | 4.6° | -9.5° | 57.7 | 71% | 110 | 51.5 |
| Apr | 28.9° | 7.6° | -5.7° | 50.7 | 66% | 154 | 48 |
| May | 33.2° | 12.6° | -2° | 55.8 | 63% | 194 | 47.1 |
| Jun | 37.9° | 16.2° | 1.9° | 40.5 | 59% | 214 | 40.2 |
| Jul | 38.6° | 21.5° | 6.5° | 8.4 | 48% | 240 | 37.3 |
| Aug | 39.2° | 20.9° | 6° | 12.7 | 46% | 201 | 40.6 |
| Sep | 37.5° | 16.3° | -0.4° | 18.9 | 50% | 144 | 39.9 |
| Oct | 30.3° | 9.7° | -9.2° | 40.9 | 61% | 93 | 48.3 |
| Nov | 22.3° | 3.8° | -14.8° | 54.3 | 71% | 49 | 57.7 |
| Dec | 14.4° | -0.3° | -22.4° | 71.3 | 80% | 34 | 64.1 |
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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