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Weather & Climate
Roosevelt County, Montana, United States
Overview
Available climate summaries for Roosevelt County. Origins and reference periods are unverified; stored values may include AI estimates. Treat these as estimates until independently verified.
Key Metrics
Annual Avg
6.3°C
Summer Avg
20.5°C
Winter Avg
-8°C
Record High
41.5°C
Record Low
-36°C
Annual Precipitation
394.6 mm
Avg Humidity
65%
Summer Humidity
53%
Winter Humidity
82%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 12.4° | -8.8° | -36° | 13.6 | 85% | 50 | 66.4 |
| Feb | 17.6° | -7.9° | -34.6° | 11.5 | 79% | 77 | 71 |
| Mar | 24.1° | -0.6° | -32.6° | 17.1 | 67% | 120 | 69.6 |
| Apr | 31.1° | 6° | -17.6° | 30.9 | 58% | 147 | 62.4 |
| May | 33.7° | 12.5° | -5.4° | 66.6 | 56% | 184 | 70.5 |
| Jun | 37.9° | 18° | 2.4° | 78.3 | 57% | 194 | 54.6 |
| Jul | 41.5° | 22.6° | 7.8° | 45.9 | 51% | 212 | 69.2 |
| Aug | 39.5° | 20.9° | 5° | 40.9 | 51% | 174 | 56.4 |
| Sep | 35.9° | 14.7° | -3.8° | 35.7 | 57% | 123 | 53.2 |
| Oct | 28.9° | 6° | -15.5° | 25.4 | 65% | 82 | 64.4 |
| Nov | 20.4° | -1° | -24° | 14.4 | 74% | 48 | 67.2 |
| Dec | 11° | -7.2° | -33.6° | 14.3 | 83% | 36 | 58.8 |
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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