Roosevelt County Climate
Roosevelt County, Montana
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
42.4°F
Annual Precip
13.9"
Annual Snowfall
28.2"
Extreme Heat Days
25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
4a
Minimum winter temperature range for plant survival
2,180
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Roosevelt County
Climate Verdict
Roosevelt County has a cool, averaging 42.4°F annually, arid conditions receiving just 13.9 inches of precipitation annually, occasional hot days — 24.549999999999997 per year above 90°F, moderate snowfall of 28.2 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 13.4°F. summers are pleasantly cool with July averaging 70.0°F. Residents experience a substantial 57°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Roosevelt County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Roosevelt County closely matches the Montana statewide average temperature of 43.7°F.
Climate Profile
About Roosevelt County Weather
A Harsh Northern Plains Environment
Roosevelt County’s annual average temperature of 42.4°F is well below the national median, reflecting its position in the northern Great Plains. The climate is characterized by low moisture and high thermal variability.
Colder Than the Montana Average
The county sits below the state’s 43.7°F average, making it one of the cooler regions in Montana. It also receives less moisture than the state norm, with only 13.9 inches of annual precipitation.
Dry Skies and Bitter Winters
Roosevelt is notably drier than the state average, missing the 15.4-inch mark by over an inch. Its 28.2 inches of annual snowfall is relatively light for Montana, but the lack of cover often leads to deeper soil freezing.
Intense Summer Sun and Frigid Januarys
January is brutal with an average temperature of 13.4°F, while July recovers to a warm 70.0°F. Despite the cold winters, the county still endures 25 days of extreme heat over 90°F every year.
Gear Up for Deep Freezes
Homeowners must prioritize high-efficiency heating systems and insulation to combat the 13.4°F January average. Because of the 25 extreme heat days, dual-purpose HVAC systems are increasingly necessary for year-round comfort.
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.