Valley County Climate
Valley County, Montana
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
41.8°F
Annual Precip
13.8"
Annual Snowfall
34.4"
Extreme Heat Days
23
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
4a
Minimum winter temperature range for plant survival
2,072
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Valley County
Climate Verdict
Valley County has a cool, averaging 41.8°F annually, arid conditions receiving just 13.8 inches of precipitation annually, occasional hot days — 23.185714285714287 per year above 90°F, moderate snowfall of 34.4 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 13.3°F. summers are pleasantly cool with July averaging 69.4°F. Residents experience a substantial 56°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Valley County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Valley County closely matches the Montana statewide average temperature of 43.7°F.
Climate Profile
About Valley County Weather
Extreme seasonal temperature swings
Valley County has a low average annual temperature of 41.8°F, reflecting its northern latitude and distance from moderating oceans. It is a dry region, receiving just 13.8 inches of annual precipitation.
Montana's cold winter champion
The county is colder than the state average of 43.7°F, largely due to its brutal winter months. January averages a frigid 13.3°F, making it one of the coldest inhabited places in the state.
Hotter and colder than the west
Valley County sees 23 days of extreme heat, which is far more than Teton's 9 days. However, its winter average of 15.7°F is significantly harsher than the more moderate 26.0°F seen in Sweet Grass County.
From deep freeze to high heat
Winters are extreme, with an average temperature of just 15.7°F and 34.4 inches of snow. Summers are surprisingly warm, averaging 66.7°F with July peaks hitting 69.4°F.
Gear up for extreme cold
Robust home heating and vehicle block heaters are essential for the 13.3°F January lows. While snowfall is moderate at 34.4 inches, the wind and extreme cold make winter preparedness the primary concern for residents.
Frequently Asked Questions
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Track your own weather in Valley County
Ambient Weather personal weather stations give you hyperlocal climate data.
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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.