LaSalle County Climate
LaSalle County, Illinois
Avg Annual Temp
49.8°F
Annual Precip
38.0"
Annual Snowfall
25.6"
Extreme Heat Days
17.066666666666666
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About LaSalle County Weather
Typical central continental weather
LaSalle County averages 49.8°F, which is cooler than the national median for annual temperature. Its 38.0 inches of precipitation is also slightly below the national average for the eastern half of the U.S.
Cooler and drier than average
At 49.8°F, the county is three degrees cooler than the Illinois state average of 52.8°F. It is also drier than the state average, receiving 38.0 inches of rain compared to 41.7 inches.
Mirroring the heart of Illinois
LaSalle’s climate nearly matches Knox County’s 49.9°F average temperature. However, it is slightly drier than Kendall County, which receives two additional inches of annual precipitation.
Consistent seasonal temperature swings
The area sees 17 days of extreme heat above 90°F each summer. Winter is standard for the region, with an average temperature of 25.7°F and 25.6 inches of snowfall.
Balance heating and cooling needs
Moderate snowfall of 25.6 inches requires standard winter maintenance tools. Residents should also prepare for 17 days of extreme summer heat with reliable home cooling systems.
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.