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Weather & Climate
Plains, Montana, United States
Overview
Climate data and monthly weather averages for Plains.
Key Metrics
Annual Avg
5°C
Summer Avg
16.8°C
Winter Avg
-6.1°C
Record High
38.5°C
Record Low
-35.9°C
Annual Precipitation
694.8 mm
Avg Humidity
76%
Summer Humidity
59%
Winter Humidity
95%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 8.2° | -6.3° | -30.8° | 75 | 95% | 35 | 24.6 |
| Feb | 11.2° | -5.5° | -35.9° | 61.3 | 94% | 56 | 25.2 |
| Mar | 19.5° | -0.9° | -32.6° | 74.4 | 87% | 99 | 25.5 |
| Apr | 24.3° | 3.5° | -11.4° | 60.3 | 77% | 136 | 26.9 |
| May | 29.3° | 9.1° | -6° | 65.7 | 71% | 173 | 28.6 |
| Jun | 36.4° | 13.1° | -2° | 67.5 | 70% | 186 | 21.1 |
| Jul | 37° | 18.8° | 1.9° | 20.2 | 56% | 225 | 23.5 |
| Aug | 38.5° | 18.5° | 2.4° | 25.7 | 50% | 185 | 19.1 |
| Sep | 32.8° | 13° | -6.8° | 32.1 | 55% | 126 | 21.4 |
| Oct | 27.6° | 5.1° | -20.5° | 60.4 | 71% | 77 | 25.7 |
| Nov | 16.4° | -1.5° | -24.9° | 76.2 | 87% | 38 | 28.8 |
| Dec | 6.2° | -6.5° | -31.8° | 76 | 95% | 28 | 28.9 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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