Historical Weather Records & Monthly Climate for Waukegan, IL

All-Time High
104°F
All-Time Low
-23°F
Max Daily Snow
9.8"
Max Daily Rain
3.95"
Max Snow Depth
0

Monthly Climate Averages for Waukegan, IL

Based on 30 years of historical data (1994 - 2023)

MonthHigh (°F)Low (°F)Precip (in)Snow (in)
January30°19°2.22"8.51"
February31°20°2.18"7.37"
March39°28°2.57"4.17"
April48°39°4.02"2.03"
May60°50°4.21"0.02"
June73°63°3.66"0
July79°69°3.22"0
August78°69°3.77"0
September71°62°2.8"0
October59°50°3.36"0.22"
November46°38°2.37"1.94"
December36°27°2.44"6.5"

Historical Weather Extremes for Waukegan, IL

Based on 80+ years of archive data (1940 - 2024)

🔥
Longest Heatwave
4 Days
1948
Consecutive days ≥ 90°F
🧊
Deepest Freeze
43 Days
1977
Consecutive days ≤ 32°F
🏜️
Longest Drought
27 Days
1944
Consecutive days w/o rain
Wettest Month
11.17"
September 2019
Most rainfall in one month
Snowiest Month
21.72"
January 1979
Most snowfall in one month

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