Roosevelt County Climate
Roosevelt County, Montana
Avg Annual Temp
42.4°F
Annual Precip
13.9"
Annual Snowfall
28.2"
Extreme Heat Days
24.549999999999997
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.