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Weather & Climate
Lewistown, Montana, United States
Overview
Climate data and monthly weather averages for Lewistown.
Key Metrics
Annual Avg
5.6°C
Summer Avg
17.9°C
Winter Avg
-5.4°C
Record High
39.6°C
Record Low
-34.9°C
Annual Precipitation
514.4 mm
Avg Humidity
67%
Summer Humidity
54%
Winter Humidity
80%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 13.9° | -5.3° | -34.9° | 21.1 | 81% | 48 | 62.8 |
| Feb | 14.2° | -5.4° | -31.6° | 22.7 | 78% | 73 | 65.2 |
| Mar | 22.2° | -0.3° | -33.8° | 27.9 | 71% | 115 | 61.8 |
| Apr | 27.1° | 3.8° | -15.7° | 56.1 | 66% | 144 | 70.1 |
| May | 29.8° | 9.3° | -7.4° | 88.7 | 64% | 181 | 67.1 |
| Jun | 35.5° | 14.8° | -2° | 84 | 61% | 198 | 50.5 |
| Jul | 39.6° | 20.3° | 3.9° | 40.3 | 51% | 220 | 51.9 |
| Aug | 36.5° | 18.6° | 1.9° | 43.1 | 51% | 182 | 59.6 |
| Sep | 32.5° | 12.6° | -8.2° | 42.6 | 58% | 128 | 50.7 |
| Oct | 29.1° | 4.9° | -18.5° | 43.7 | 68% | 85 | 57.5 |
| Nov | 19.6° | -0.7° | -30° | 22.5 | 73% | 51 | 63.2 |
| Dec | 10.4° | -5.5° | -30.3° | 21.7 | 80% | 37 | 59.3 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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