Fullerton, CA All-Time Weather Extremes
The most extreme temperature, precipitation, and snowfall ever recorded in Fullerton, from NOAA daily weather observations.
| Temperature | ||
|---|---|---|
| Record High | 114°F (46°C) | July 6, 2018 |
| Record Low | 15.9°F (-9°C) | January 12, 1989 |
| Lowest High | 50°F (10°C) | December 10, 1972 |
| Highest Low | 80.9°F (27°C) | July 17, 2006 |
| Highest Mean | 93.0°F (34°C) | September 4, 2022 |
| Lowest Mean | 41.0°F (5°C) | February 14, 1989 |
| Precipitation | ||
| Max in One Calendar Day | 3.47" (88.1 mm) | December 6, 1997 |
| Max in One Month | 13.99" (355.3 mm) | February 1998 |
| Least in One Month | 0.00" (0.0 mm) | September 1979 |
| Max in One Year | 31.03" (788.2 mm) | 1978 |
| Least in One Year | 3.26" (82.9 mm) | 2013 |
| Period of Record | ||
| Temperature | January 1, 1970 – May 31, 2026 | |
| Precipitation | January 1, 1970 – May 31, 2026 | |
| Snowfall | January 1, 1970 – December 30, 2010 | |
Note: Records compiled from NOAA GHCN-Daily observations at SANTA ANA FIRE STN (10 mi from Fullerton, CA). 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 Fullerton, CA?
The all-time record high in Fullerton, CA is 114°F (46°C), set on July 6, 2018.
What is the coldest temperature ever recorded in Fullerton, CA?
The all-time record low in Fullerton, CA is 15.9°F (-9°C), set on January 12, 1989.
What is the most rain Fullerton, CA has ever had in one day?
The most precipitation recorded in one calendar day near Fullerton, CA is 3.47 inches, on December 6, 1997.
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