Carter County Climate
Carter County, Montana
Avg Annual Temp
43.3°F
Annual Precip
16.4"
Annual Snowfall
38.5"
Extreme Heat Days
24.066666666666663
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Carter County Weather
Prairie Winds and Northern Temps
Carter County's 43.3°F annual average is notably cooler than the national median. This southeast corner of Montana is characterized by wide-open plains and seasonal extremes.
Typical Montana Prairie Climate
The county's 43.3°F average temperature sits right at the Montana state average of 43.7°F. It experiences the standard thermal profile expected for the region.
Wetter Than Many Montana Peers
Recording 16.4 inches of annual precipitation, Carter is wetter than the state average and neighbors like Blaine. This extra moisture supports its distinct prairie ecosystem.
Warm Summers Meet Chilly Winters
July reaches a warm average of 69.9°F with 24 extreme heat days. Winters are sharp, averaging 20.4°F with 38.5 inches of snow throughout the season.
Prepare for Wind and Precipitation
Reliable HVAC systems are needed to handle 24 days of 90°F heat and 18.9°F January lows. Residents should also prepare for muddy conditions given the higher-than-average precipitation.
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.