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Weather & Climate

Petroleum County, Montana, United States

Overview

Climate data and monthly weather averages for Petroleum County.

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

MonthHigh (°C)Avg (°C)Low (°C)Rain (mm)Humidity (%)Sunshine (h)Wind (kph)
Jan18.1°-3.1°-33.2°14.673%4869.3
Feb19.7°-2.9°-27.2°15.469%7365
Mar27.1°2.6°-32.9°21.763%11560.8
Apr32.3°7.6°-13°44.458%14466.2
May35°13.2°-4.5°7956%18175.2
Jun39.6°18.6°1.4°73.855%19851.8
Jul44.2°24.4°7.8°36.344%22064.8
Aug40.6°22.7°5.6°41.543%18267.5
Sep37.6°16.5°-2.7°36.649%12851.2
Oct34.4°8.2°-15°38.860%8559.9
Nov24.8°2.1°-22.9°15.965%5162.3
Dec15.8°-3°-28.1°15.872%3763.1

Frequently Asked Questions

Sources: NASA POWER · Last updated: 2025

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