Hillsboro, OR All-Time Weather Extremes
The most extreme temperature, precipitation, and snowfall ever recorded in Hillsboro, from NOAA daily weather observations.
| Temperature | ||
|---|---|---|
| Record High | 113°F (45°C) | June 29, 2021 |
| Record Low | -11.9°F (-24°C) | February 3, 1950 |
| Lowest High | 12.9°F (-11°C) | January 12, 1909 |
| Highest Low | 75°F (24°C) | July 16, 1911 and July 22, 2006 |
| Highest Mean | 91°F (33°C) | June 28, 2021 |
| Lowest Mean | 0.9°F (-17°C) | January 12, 1909 |
| Precipitation | ||
| Max in One Calendar Day | 6.10" (154.9 mm) | January 12, 1912 |
| Max in One Month | 20.82" (528.9 mm) | February 1999 |
| Least in One Month | 0.00" (0.0 mm) | August 1904 |
| Max in One Year | 77.28" (1962.8 mm) | 1999 |
| Least in One Year | 25.44" (646.1 mm) | 1985 |
| Snowfall | ||
| Max in One Calendar Day | 17.2" (43.7 cm) | January 3, 1895 |
| Max in One Month | 58.8" (149.3 cm) | January 1950 |
| Max in One Season | 60.8" (154.4 cm) | 1949-50 |
| Max in One Year | 60.8" (154.4 cm) | 1950 |
| Earliest Snow | 4.4" (11.2 cm) | October 28, 1996 |
| Earliest Measurable Snow | 4.4" (11.2 cm) | October 28, 1996 |
| Latest Snow | 0.3" (0.8 cm) | April 17, 1972 |
| Latest Measurable Snow | 0.3" (0.8 cm) | April 17, 1972 |
| Period of Record | ||
| Temperature | January 1, 1893 – July 31, 2026 | |
| Precipitation | January 1, 1893 – July 31, 2026 | |
| Snowfall | January 15, 1893 – August 31, 2025 | |
Note: Records compiled from NOAA GHCN-Daily observations at FOREST GROVE (7 mi from Hillsboro, OR). 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 Hillsboro, OR?
The all-time record high in Hillsboro, OR is 113°F (45°C), set on June 29, 2021.
What is the coldest temperature ever recorded in Hillsboro, OR?
The all-time record low in Hillsboro, OR is -11.9°F (-24°C), set on February 3, 1950.
What is the most rain Hillsboro, OR has ever had in one day?
The most precipitation recorded in one calendar day near Hillsboro, OR is 6.10 inches, on January 12, 1912.
What is the biggest snowfall ever recorded in Hillsboro, OR?
The most snow recorded in one calendar day near Hillsboro, OR is 17.2 inches, on January 3, 1895.
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Hillsboro Weather History
Monthly averages, records, and climate data for Hillsboro
Oregon Weather Extremes
Statewide records and extremes for other Oregon cities