Joliet, IL All-Time Weather Extremes
The most extreme temperature, precipitation, and snowfall ever recorded in Joliet, from NOAA daily weather observations.
| Temperature | ||
|---|---|---|
| Record High | 102.9°F (39°C) | July 8, 1897 and July 9, 1897 |
| Record Low | -20°F (-29°C) | January 25, 1897 and February 9, 1899 and February 2, 1951 |
| Lowest High | -5.9°F (-21°C) | February 9, 1899 and January 29, 1966 |
| Highest Low | 78.9°F (26°C) | September 5, 1960 |
| Highest Mean | 90°F (32°C) | June 20, 1953 |
| Lowest Mean | -12.9°F (-25°C) | February 9, 1899 |
| Precipitation | ||
| Max in One Calendar Day | 6.86" (174.2 mm) | June 11, 1926 |
| Max in One Month | 13.93" (353.9 mm) | September 1961 |
| Least in One Month | 0.07" (1.7 mm) | November 1917 |
| Max in One Year | 56.13" (1425.7 mm) | 1902 |
| Least in One Year | 24.10" (612.2 mm) | 1912 |
| Snowfall | ||
| Max in One Calendar Day | 10.5" (26.7 cm) | November 5, 1896 |
| Max in One Month | 21.9" (55.7 cm) | December 1951 |
| Max in One Season | 49.4" (125.4 cm) | 1969-70 |
| Max in One Year | 50.4" (127.9 cm) | 1951 |
| Earliest Snow | 1.0" (2.5 cm) | October 18, 1972 |
| Earliest Measurable Snow | 1.0" (2.5 cm) | October 18, 1972 |
| Latest Snow | 2.0" (5.1 cm) | April 23, 1967 |
| Latest Measurable Snow | 2.0" (5.1 cm) | April 23, 1967 |
| Period of Record | ||
| Temperature | November 1, 1893 – November 30, 1974 | |
| Precipitation | November 1, 1893 – February 5, 2025 | |
| Snowfall | November 1, 1893 – November 30, 1974 | |
Note: Records compiled from NOAA GHCN-Daily observations at JOLIET (9 mi from Joliet, IL). Quality-flagged readings are excluded. Monthly and annual totals require substantially complete reporting for “least” records.
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Frequently Asked Questions
What is the hottest temperature ever recorded in Joliet, IL?
The all-time record high in Joliet, IL is 102.9°F (39°C), set on July 8, 1897 and July 9, 1897.
What is the coldest temperature ever recorded in Joliet, IL?
The all-time record low in Joliet, IL is -20°F (-29°C), set on January 25, 1897 and February 9, 1899 and February 2, 1951.
What is the most rain Joliet, IL has ever had in one day?
The most precipitation recorded in one calendar day near Joliet, IL is 6.86 inches, on June 11, 1926.
What is the biggest snowfall ever recorded in Joliet, IL?
The most snow recorded in one calendar day near Joliet, IL is 10.5 inches, on November 5, 1896.
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