Lake County Climate
Lake County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.4°F
Annual Precip
37.0"
Annual Snowfall
43.3"
Extreme Heat Days
10
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
2,790
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Lake County
Climate Verdict
Lake County has a cool, averaging 48.4°F annually, moderate rainfall of 37.0 inches per year, rare extreme heat with only 10.379999999999999 days above 90°F annually, moderate snowfall of 43.3 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 22.3°F. summers are warm — July averages 72.4°F. Residents experience a substantial 50°F difference between winter and summer.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Lake County is 4.5°F cooler than the Illinois statewide average of 52.8°F, it is somewhat drier than average for Illinois, the county experiences 16.8810321969697 fewer extreme heat days than the state average.
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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Track your own weather in Lake County
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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.