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Weather & Climate
Petroleum County, Montana, United States
Overview
Available climate summaries for Petroleum County. Origins and reference periods are unverified; stored values may include AI estimates. Treat these as estimates until independently verified.
Key Metrics
Annual Avg
8.9°C
Summer Avg
21.9°C
Winter Avg
-3°C
Record High
44.2°C
Record Low
-33.2°C
Annual Precipitation
433.8 mm
Avg Humidity
59%
Summer Humidity
47%
Winter Humidity
71%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 18.1° | -3.1° | -33.2° | 14.6 | 73% | 48 | 69.3 |
| Feb | 19.7° | -2.9° | -27.2° | 15.4 | 69% | 73 | 65 |
| Mar | 27.1° | 2.6° | -32.9° | 21.7 | 63% | 115 | 60.8 |
| Apr | 32.3° | 7.6° | -13° | 44.4 | 58% | 144 | 66.2 |
| May | 35° | 13.2° | -4.5° | 79 | 56% | 181 | 75.2 |
| Jun | 39.6° | 18.6° | 1.4° | 73.8 | 55% | 198 | 51.8 |
| Jul | 44.2° | 24.4° | 7.8° | 36.3 | 44% | 220 | 64.8 |
| Aug | 40.6° | 22.7° | 5.6° | 41.5 | 43% | 182 | 67.5 |
| Sep | 37.6° | 16.5° | -2.7° | 36.6 | 49% | 128 | 51.2 |
| Oct | 34.4° | 8.2° | -15° | 38.8 | 60% | 85 | 59.9 |
| Nov | 24.8° | 2.1° | -22.9° | 15.9 | 65% | 51 | 62.3 |
| Dec | 15.8° | -3° | -28.1° | 15.8 | 72% | 37 | 63.1 |
Data sources
Estimates and unverified origins
Oyster List climate data - Climate origins are unverified. Available methods include historical APIs and AI estimates; stored rows do not identify the original dataset, reference period, or model for each value. Treat these summaries as estimates until independently verified. Record updated 2026-03-23.
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