Petroleum County Climate
Petroleum County, Montana
Avg Annual Temp
46.5°F
Annual Precip
14.8"
Annual Snowfall
43.4"
Extreme Heat Days
35.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Petroleum County Weather
Wide Open and Cooler Than Most
A 46.5°F average keeps Petroleum County about 8 degrees below the national median. This semi-arid region is characterized by wide-open spaces and distinct seasonal shifts.
One of Montana's Warmer Hubs
The county’s 46.5°F temperature ranks comfortably above the 43.7°F Montana average. It serves as one of the state's warmer agricultural territories.
Dry Land and High Snowfall
Its 14.8 inches of precipitation is slightly lower than the state average of 15.4 inches. Despite the relative warmth, it experiences 43.4 inches of snow, surpassing its southern neighbors.
Scorching Summers and Stable Winters
Summers are hot with 35 days of extreme heat and a 70.4°F July average. Winters stay relatively mild for Montana, averaging 26.1°F from December through February.
Versatile HVAC Systems Required
Reliable climate control is necessary to bridge the gap between 90°F summer peaks and the 25.0°F January lows. Outdoor planning must also account for the significant 43.4 inches of annual snow.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.