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Weather & Climate
Boulder, Montana, United States
Overview
Climate data and monthly weather averages for Boulder.
Key Metrics
Annual Avg
4.8°C
Summer Avg
17.3°C
Winter Avg
-6.9°C
Record High
38.6°C
Record Low
-35.7°C
Annual Precipitation
535.5 mm
Avg Humidity
69%
Summer Humidity
55%
Winter Humidity
86%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 8.3° | -7.4° | -31.4° | 31.3 | 89% | 47 | 40.6 |
| Feb | 12.9° | -6.2° | -28.8° | 33.6 | 83% | 70 | 37.9 |
| Mar | 19.5° | -0.5° | -30° | 40.6 | 73% | 114 | 40.7 |
| Apr | 25.7° | 3.4° | -12.9° | 60.3 | 67% | 145 | 41.8 |
| May | 31.5° | 8.9° | -7° | 72.2 | 64% | 177 | 35.2 |
| Jun | 34.6° | 14° | -2.3° | 77.7 | 62% | 195 | 39.1 |
| Jul | 38.6° | 19.6° | 2.4° | 33.5 | 53% | 225 | 31.6 |
| Aug | 35.8° | 18.2° | -0.3° | 33.8 | 51% | 187 | 34.5 |
| Sep | 32.7° | 12.5° | -6.4° | 39.9 | 56% | 134 | 32.5 |
| Oct | 27.3° | 4.5° | -19.3° | 42.5 | 66% | 86 | 39 |
| Nov | 19.1° | -1.9° | -29.6° | 35.4 | 76% | 49 | 39.4 |
| Dec | 9.2° | -7.2° | -35.7° | 34.7 | 85% | 36 | 44 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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