Naperville, IL All-Time Weather Extremes
The most extreme temperature, precipitation, and snowfall ever recorded in Naperville, from NOAA daily weather observations.
| Temperature | ||
|---|---|---|
| Record High | 111°F (44°C) | July 14, 1936 |
| Record Low | -25.9°F (-32°C) | January 20, 1985 |
| Lowest High | -14°F (-26°C) | January 31, 2019 |
| Highest Low | 82°F (28°C) | July 29, 1941 |
| Highest Mean | 90°F (32°C) | July 22, 1934 and August 22, 1936 |
| Lowest Mean | -19.5°F (-29°C) | January 31, 2019 |
| Precipitation | ||
| Max in One Calendar Day | 16.91" (429.5 mm) | July 18, 1996 |
| Max in One Month | 21.50" (546.1 mm) | July 1996 |
| Least in One Month | 0.00" (0.0 mm) | September 1979 |
| Max in One Year | 57.15" (1451.7 mm) | 2019 |
| Least in One Year | 22.12" (561.9 mm) | 1956 |
| Snowfall | ||
| Max in One Calendar Day | 17.0" (43.2 cm) | February 2, 2011 |
| Max in One Month | 36.5" (92.6 cm) | December 1951 |
| Max in One Season | 69.8" (177.2 cm) | 2013-14 |
| Max in One Year | 59.3" (150.6 cm) | 2014 |
| Earliest Snow | 0.2" (0.5 cm) | September 25, 1942 |
| Earliest Measurable Snow | 0.2" (0.5 cm) | September 25, 1942 |
| Latest Snow | 0.1" (0.3 cm) | May 10, 1945 |
| Latest Measurable Snow | 0.1" (0.3 cm) | May 10, 1945 |
| Period of Record | ||
| Temperature | January 1, 1893 – August 3, 2026 | |
| Precipitation | January 1, 1893 – August 3, 2026 | |
| Snowfall | January 1, 1893 – August 3, 2026 | |
Note: Records compiled from NOAA GHCN-Daily observations at AURORA WATER (9 mi from Naperville, 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 Naperville, IL?
The all-time record high in Naperville, IL is 111°F (44°C), set on July 14, 1936.
What is the coldest temperature ever recorded in Naperville, IL?
The all-time record low in Naperville, IL is -25.9°F (-32°C), set on January 20, 1985.
What is the most rain Naperville, IL has ever had in one day?
The most precipitation recorded in one calendar day near Naperville, IL is 16.91 inches, on July 18, 1996.
What is the biggest snowfall ever recorded in Naperville, IL?
The most snow recorded in one calendar day near Naperville, IL is 17.0 inches, on February 2, 2011.
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