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Weather & Climate
Gilliam County, Oregon, United States
Overview
Climate data and monthly weather averages for Gilliam County.
Key Metrics
Annual Avg
11.4°C
Summer Avg
21.2°C
Winter Avg
2.3°C
Record High
41.8°C
Record Low
-17.3°C
Annual Precipitation
320.1 mm
Avg Humidity
62%
Summer Humidity
50%
Winter Humidity
76%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 20° | 1.9° | -17.3° | 38.1 | 78% | 40 | 54.7 |
| Feb | 20.6° | 3.4° | -12.8° | 28 | 71% | 65 | 58.6 |
| Mar | 28.4° | 6.9° | -9.4° | 31.3 | 65% | 110 | 51 |
| Apr | 32.5° | 10.1° | -3.7° | 29.1 | 61% | 154 | 54.2 |
| May | 37.4° | 15° | 0.4° | 32.9 | 57% | 195 | 48.4 |
| Jun | 40.3° | 18.4° | 3.9° | 23.1 | 55% | 214 | 46.7 |
| Jul | 41.8° | 22.9° | 8.2° | 4.6 | 48% | 238 | 41.1 |
| Aug | 41.3° | 22.3° | 7.6° | 8.1 | 47% | 201 | 41.7 |
| Sep | 40° | 17.8° | 0.9° | 11.4 | 51% | 143 | 48.3 |
| Oct | 32.8° | 11.3° | -7.6° | 27.9 | 61% | 92 | 53.9 |
| Nov | 23° | 5.4° | -9.4° | 34.5 | 71% | 49 | 65.3 |
| Dec | 18.4° | 1.5° | -16.6° | 51.1 | 78% | 34 | 65.7 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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