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Weather & Climate
Yellowstone County, Montana, United States
Overview
Climate data and monthly weather averages for Yellowstone County.
Key Metrics
Annual Avg
9.2°C
Summer Avg
22.2°C
Winter Avg
-2.7°C
Record High
43.8°C
Record Low
-33.4°C
Annual Precipitation
413.9 mm
Avg Humidity
58%
Summer Humidity
46%
Winter Humidity
69%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 17.4° | -2.8° | -28.9° | 15.2 | 71% | 57 | 65 |
| Feb | 19.1° | -2.4° | -25.6° | 17.6 | 67% | 79 | 65.1 |
| Mar | 26.8° | 3° | -33.4° | 24.5 | 62% | 118 | 63.1 |
| Apr | 31.8° | 7.6° | -12° | 46.2 | 58% | 141 | 62.3 |
| May | 35.1° | 13.2° | -4.5° | 77.8 | 56% | 176 | 65.2 |
| Jun | 39.5° | 19° | 2.7° | 59.7 | 53% | 202 | 51.8 |
| Jul | 43.8° | 24.7° | 7.9° | 30.4 | 44% | 220 | 49.1 |
| Aug | 40.5° | 22.9° | 5.3° | 32.9 | 42% | 185 | 63.1 |
| Sep | 38.5° | 16.8° | -2.2° | 36 | 48% | 137 | 52.3 |
| Oct | 33.8° | 8.4° | -15° | 40 | 59% | 91 | 58 |
| Nov | 24.1° | 2.2° | -24.5° | 16.5 | 64% | 57 | 60.7 |
| Dec | 16.1° | -2.8° | -27.3° | 17.1 | 70% | 43 | 63.4 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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