Big Horn County Climate
Big Horn County, Wyoming
Avg Annual Temp
45.8°F
Annual Precip
7.1"
Annual Snowfall
18.6"
Extreme Heat Days
40.81428571428571
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Big Horn County Weather
A High Desert Climate with Low Rainfall
With an annual average of 45.8°F, Big Horn County is cooler than the national median but maintains an arid profile. It receives just 7.1 inches of precipitation annually, making it one of the driest counties in the country.
Warmer than the Typical Wyoming Average
At 45.8°F, Big Horn stays warmer than the state average of 43.8°F. However, its 7.1 inches of rainfall is nearly 50% lower than the state's typical 13.9 inches.
Drier than Neighboring Fremont County
Big Horn is significantly more arid than nearby Fremont County, receiving about 3.3 inches less precipitation per year. It is also warmer on average, exceeding Fremont's annual temperature by over 2 degrees.
Hot Summers and Very Dry Winters
Summers are intense with 41 days reaching 90°F or higher and a July average of 73.0°F. Conversely, winter snowfall is relatively light at just 18.6 inches per year.
Prioritize Air Conditioning and Water Conservation
Reliable air conditioning is vital for the 41 annual extreme heat days. Homeowners should also focus on xeriscaping and drought-resistant landscaping due to the extremely low 7.1-inch annual 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.