Lawrence County Climate
Lawrence County, Illinois
Avg Annual Temp
55.3°F
Annual Precip
44.1"
Annual Snowfall
15.5"
Extreme Heat Days
40.5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Lawrence County Weather
A Warmer Profile in the Heartland
Lawrence County maintains an average annual temperature of 55.3°F, placing it well above the national median for continental climates. Its position in southeastern Illinois results in a humid profile with 44.1 inches of annual precipitation, exceeding typical interior averages.
Warmth Exceeding the Illinois Average
The county's 55.3°F annual average temperature is significantly higher than the Illinois state average of 52.8°F. This makes Lawrence one of the warmer spots in the state, benefitting from its southern latitude.
Southeastern Illinois Comparison
While neighbors to the north experience harsher winters, Lawrence sees a milder December through February average of 33.5°F. It receives more annual rainfall than central neighbors like Logan or Macon, totaling 44.1 inches compared to their sub-40-inch averages.
Intense Summers and Mild Winters
Residents face 41 days of extreme heat over 90°F annually, reflecting a humid and intense summer peak of 77.2°F in July. Winter brings a manageable 15.5 inches of snowfall, which is much lower than the northern regions of the state.
Planning for High Heat and Humidity
High-efficiency cooling systems are essential here given the 41 annual extreme heat days. Homeowners should also maintain clear gutters and drainage systems to handle the significant 44.1 inches of annual rainfall.
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.