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 | 100°F (38°C) | July 14, 1974 |
| Record Low | -16.9°F (-27°C) | January 21, 1970 |
| Lowest High | -2.9°F (-19°C) | January 21, 1970 |
| Highest Low | 78.8°F (26°C) | June 22, 2025 |
| Highest Mean | 88.5°F (31°C) | July 2, 1970 |
| Lowest Mean | -9.9°F (-23°C) | January 21, 1970 |
| Precipitation | ||
| Max in One Calendar Day | 3.37" (85.6 mm) | June 21, 1970 |
| Max in One Month | 9.05" (229.9 mm) | August 1972 |
| Least in One Month | 0.46" (11.7 mm) | September 2025 |
| Max in One Year | 43.24" (1098.3 mm) | 1970 |
| Least in One Year | 30.02" (762.5 mm) | 1971 |
| Snowfall | ||
| Max in One Calendar Day | 9.0" (22.9 cm) | March 26, 1970 |
| Max in One Month | 17.9" (45.5 cm) | January 1970 |
| Max in One Season | 37.4" (95.0 cm) | 1969-70 |
| Max in One Year | 37.4" (95.0 cm) | 1970 |
| Earliest Snow | 1.0" (2.5 cm) | October 18, 1972 |
| Earliest Measurable Snow | 1.0" (2.5 cm) | October 18, 1972 |
| Latest Snow | 5.0" (12.7 cm) | April 2, 1970 |
| Latest Measurable Snow | 5.0" (12.7 cm) | April 2, 1970 |
| Period of Record | ||
| Temperature | January 1, 1970 – July 31, 2026 | |
| Precipitation | January 1, 1970 – July 31, 2026 | |
| Snowfall | January 1, 1970 – 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 100°F (38°C), set on July 14, 1974.
What is the coldest temperature ever recorded in Joliet, IL?
The all-time record low in Joliet, IL is -16.9°F (-27°C), set on January 21, 1970.
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 3.37 inches, on June 21, 1970.
What is the biggest snowfall ever recorded in Joliet, IL?
The most snow recorded in one calendar day near Joliet, IL is 9.0 inches, on March 26, 1970.
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