Lewis County Climate
Lewis County, Missouri
Avg Annual Temp
52.3°F
Annual Precip
38.3"
Annual Snowfall
17.8"
Extreme Heat Days
26.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Lewis County Weather
Cooler Winds from the Upper Mississippi
Lewis County is cooler than the national median with an annual average of 52.3°F. Its location in the northeast corner of the state brings a more pronounced winter chill.
A Cooler and Drier Missouri Exception
The county ranks well below the 54.9°F state average for temperature. Its 38.3 inches of annual rain also makes it one of the drier counties in Missouri.
The Snow Capital of the Region
With 17.8 inches of snow, Lewis is significantly whiter in winter than southern counties like Madison. It also experiences ten fewer extreme heat days than the state average.
Deep Freezes and Moderate Summers
Winters are harsh with a January average of 25.7°F and heavy snowfall. July brings a moderate 75.5°F average, with only 26 days reaching the 90°F mark.
Winterize for Significant Snowfall
Residents should invest in heavy-duty winter gear and home insulation to handle the 17.8 inches of snow. Cooling costs are typically lower here than in the rest of the state.
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.