Pettis County Climate
Pettis County, Missouri
Avg Annual Temp
54.3°F
Annual Precip
39.9"
Annual Snowfall
13.1"
Extreme Heat Days
34.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Pettis County Weather
Pettis County Closely Mirrors National Medians
Pettis County maintains an annual average temperature of 54.3°F, placing it right in line with the national median. This climate is typical of the humid continental zone where warm summers meet cold, distinct winters.
Slightly Cooler Than the Missouri Average
The county's average temperature of 54.3°F is slightly lower than the Missouri state average of 54.9°F. It also receives 39.9 inches of annual precipitation, which is roughly 4 inches less than the state benchmark.
Mid-State Climate Stability
Pettis is slightly cooler than southern neighbor Benton but shares a similar profile with Saline County to the north. Its 13.1 inches of snowfall is standard for Central Missouri, providing moderate winter coverage compared to the state's northern tier.
Hot Summers and Bracing Winters
July averages reach 77.1°F with residents facing 34 extreme heat days above 90°F annually. Winters are chilly, with a January average of 29.3°F and a total seasonal snowfall of 13.1 inches.
Prepare for Heat and Ice
Residents should invest in cooling systems to handle over a month of extreme heat. Reliable winter tires and salt are essential for managing the annual snowfall and freezing January temperatures.
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.