Petroleum County Climate
Petroleum County, Montana
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
46.5°F
Annual Precip
14.8"
Annual Snowfall
43.4"
Extreme Heat Days
35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
4b
Minimum winter temperature range for plant survival
2,253
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Petroleum County
Climate Verdict
Petroleum County has a cool, averaging 46.5°F annually, arid conditions receiving just 14.8 inches of precipitation annually, occasional hot days — 35.4 per year above 90°F, moderate snowfall of 43.4 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 25.0°F. summers are warm — July averages 70.4°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Petroleum County closely matches the Montana statewide average temperature of 43.7°F.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.