Lake County Climate
Lake County, Illinois
Avg Annual Temp
48.4°F
Annual Precip
37.0"
Annual Snowfall
43.3"
Extreme Heat Days
10.38
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Lake County Weather
A cool, lake-influenced climate
Lake County’s 48.4°F annual average is significantly cooler than the national median. Proximity to Lake Michigan creates a unique local climate with increased snowfall and moderated summer heat.
Cooler and snowier than average
The county's 48.4°F average temperature is over four degrees cooler than the Illinois average. It stands out state-wide for its 43.3 inches of snow, far exceeding typical Illinois levels.
The snow leader of the region
Lake County receives 43.3 inches of snow, much more than Kane’s 32.8 inches or Kankakee’s 23.9 inches. It is also slightly cooler than Kane County by about one degree annually.
Mild summers and snowy winters
Summers are very comfortable with only 10 days over 90°F. Winters are the main event, bringing 43.3 inches of snow and an average temperature of 25.3°F.
Invest in heavy snow gear
Residents must prioritize snow removal equipment to handle the massive 43.3 inches of annual accumulation. Summer cooling needs are lower here than in most of Illinois, with only 10 extreme heat days.
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.