Yellowstone County Climate
Yellowstone County, Montana
Avg Annual Temp
46.7°F
Annual Precip
14.7"
Annual Snowfall
44.2"
Extreme Heat Days
37
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Yellowstone County Weather
Montana's warm, urban corridor
Yellowstone County averages 46.7°F annually, one of the highest in the state but still below the national median. The area is relatively dry, recording 14.7 inches of annual precipitation.
One of Montana's warmest regions
The county's 46.7°F average is three degrees warmer than the state average of 43.7°F. This warmth is most apparent in the summer, when the county records 37 days of extreme heat.
Heat leader of the region
Yellowstone County experiences 37 days over 90°F, far exceeding the 15 days seen in neighboring Wheatland. Its 44.2 inches of snowfall is moderate, providing a milder winter experience than the high mountains to the west.
Long summers and moderate winters
July is hot with an average of 71.6°F, and the summer season overall averages 68.4°F. Winter remains cold with a 26.1°F average, though it is significantly warmer than the state's northern border counties.
Focus on summer cooling
Because of the 37 days of extreme heat, central air conditioning is a standard requirement for comfort here. While winter is milder than elsewhere in Montana, residents still need to prepare for 44.2 inches of snow and January lows averaging 24.8°F.
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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.