Lewis County Climate
Lewis County, Missouri
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
52.3°F
Annual Precip
38.3"
Annual Snowfall
17.8"
Extreme Heat Days
26
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,548
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Lewis County
Climate Verdict
Lewis County has a mild, with an average annual temperature of 52.3°F, moderate rainfall of 38.3 inches per year, occasional hot days — 26.2 per year above 90°F, light snow averaging 17.8 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 25.7°F. summers are warm — July averages 75.5°F. The 50°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Lewis County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Lewis County closely matches the Missouri statewide average temperature of 54.9°F, it is also noticeably drier, receiving 5.4 inches less precipitation than the state average.
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 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.