Historical Weather in Joliet, IL
See 55+ years of weather history for any date in Joliet going back to 1970.
Part of Illinois weather history · Illinois temperature records
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Monthly Climate Averages
Historical temperature and precipitation averages for Joliet, IL, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Joliet, IL Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Joliet, IL Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Joliet, IL Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Growing Season & Frost in Joliet, IL
Based on the dates the average overnight low reaches freezing (32°F / 0°C), from 50+ years of NOAA station data.
Hours of Daylight in Joliet, IL
Day length across the year at 41.5°N latitude. Computed from solar geometry.
Best Time to Visit Joliet, IL
Joliet, IL has no months that meet our "pleasant" threshold — every season has tradeoffs.
Joliet Temperature Records
- Record High: The hottest temperature ever recorded in Joliet, IL is 104°F, set on June 26, 1988.
- Record Low: The coldest temperature ever recorded in Joliet, IL is -27°F, set on January 20, 1985.
- Data Coverage: Based on 56 years of data from NOAA weather station: JOLIET.
All-Time Record High
All-Time Record Low
Monthly Temperature Records in Joliet
| Month | Record High | Record Low |
|---|---|---|
| January | 65°F(1997) | -27°F(1985) |
| February | 73°F(2000) | -21°F(2019) |
| March | 86°F(1986) | -13°F(2002) |
| April | 92°F(1986) | 9°F(1982) |
| May | 102°F(2018) | 26°F(2005) |
| June | 104°F(1988) | 35°F(1985) |
| July | 104°F(2020) | 45°F(1972) |
| August | 103°F(1988) | 39°F(1986) |
| September | 100°F(2017) | 29°F(1995) |
| October | 92°F(1971) | 17°F(1976) |
| November | 80°F(2020) | -2°F(1977) |
| December | 72°F(2012) | -21°F(1983) |