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Weather & Climate
Forsyth, Montana, United States
Overview
Climate data and monthly weather averages for Forsyth.
Key Metrics
Annual Avg
8.9°C
Summer Avg
22.3°C
Winter Avg
-3.5°C
Record High
44.5°C
Record Low
-33.3°C
Annual Precipitation
396.8 mm
Avg Humidity
60%
Summer Humidity
48%
Winter Humidity
73%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 15.6° | -3.8° | -29.1° | 12.7 | 75% | 50 | 67.1 |
| Feb | 18.8° | -3.3° | -25.5° | 14.3 | 70% | 73 | 69.9 |
| Mar | 27.3° | 2.5° | -33.3° | 20.8 | 63% | 112 | 62.3 |
| Apr | 32.2° | 7.7° | -11.4° | 43.2 | 58% | 147 | 62.8 |
| May | 36.3° | 13.4° | -4° | 79.7 | 56% | 185 | 71.7 |
| Jun | 40.2° | 19.3° | 2.5° | 61.2 | 54% | 206 | 52.8 |
| Jul | 44.5° | 24.7° | 8.4° | 34.4 | 45% | 224 | 59.9 |
| Aug | 41.6° | 23° | 5.3° | 34.1 | 44% | 186 | 72.6 |
| Sep | 38° | 16.8° | -1.3° | 34.2 | 49% | 132 | 54.9 |
| Oct | 33.7° | 8.2° | -14.9° | 34.1 | 60% | 89 | 60.8 |
| Nov | 24.5° | 1.8° | -24.1° | 13.8 | 66% | 55 | 64.2 |
| Dec | 14.9° | -3.5° | -28.1° | 14.3 | 74% | 39 | 62.1 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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