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Weather & Climate
Helena, Montana, United States
Overview
Climate data and monthly weather averages for Helena.
Key Metrics
Annual Avg
4.2°C
Summer Avg
16.5°C
Winter Avg
-7.2°C
Record High
37.5°C
Record Low
-34.5°C
Annual Precipitation
547.3 mm
Avg Humidity
72%
Summer Humidity
58%
Winter Humidity
89%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 7.4° | -7.5° | -33° | 32.9 | 92% | 47 | 42.3 |
| Feb | 11.5° | -6.7° | -33.1° | 35 | 87% | 70 | 37.8 |
| Mar | 20.1° | -1.2° | -31.4° | 41.2 | 77% | 114 | 39.4 |
| Apr | 25.3° | 2.8° | -14.3° | 58.2 | 71% | 145 | 37.4 |
| May | 30.9° | 8.3° | -7.1° | 72.9 | 67% | 177 | 37.3 |
| Jun | 33.8° | 13.2° | -2.4° | 82.8 | 65% | 195 | 34.9 |
| Jul | 37.5° | 18.8° | 1.9° | 34.4 | 55% | 225 | 29.3 |
| Aug | 34.5° | 17.4° | -0.2° | 36.9 | 54% | 187 | 36 |
| Sep | 31.1° | 11.7° | -6.3° | 41.1 | 59% | 134 | 31.5 |
| Oct | 27° | 3.9° | -20.1° | 40.6 | 70% | 86 | 38 |
| Nov | 18.8° | -2.4° | -31.3° | 35.7 | 80% | 49 | 39.3 |
| Dec | 7.8° | -7.5° | -34.5° | 35.6 | 89% | 36 | 39.7 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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