Ottawa, Canada All-Time Weather Extremes
The most extreme temperature, precipitation, and snowfall ever recorded in Ottawa, from NOAA GHCN daily weather observations.
| Temperature | ||
|---|---|---|
| Record High | 100°F (38°C) | July 4, 1913 and July 30, 1916 and August 1, 1917 |
| Record Low | -38°F (-39°C) | December 29, 1933 |
| Lowest High | -25°F (-32°C) | December 29, 1933 |
| Highest Low | 76.6°F (25°C) | August 9, 2001 |
| Highest Mean | 87.8°F (31°C) | August 9, 2001 |
| Lowest Mean | -31.5°F (-35°C) | December 29, 1933 |
| Precipitation | ||
| Max in One Calendar Day | 4.28" (108.6 mm) | September 9, 2004 |
| Max in One Month | 9.85" (250.2 mm) | July 1899 |
| Least in One Month | 0.10" (2.6 mm) | February 1978 |
| Max in One Year | 46.56" (1182.7 mm) | 2017 |
| Least in One Year | 24.33" (618.0 mm) | 1931 |
| Snowfall | ||
| Max in One Calendar Day | 22.0" (55.9 cm) | January 29, 1894 |
| Max in One Month | 54.3" (137.8 cm) | February 1971 |
| Max in One Season | 152.7" (387.8 cm) | 1970-71 |
| Max in One Year | 140.5" (356.9 cm) | 1971 |
| Earliest Snow | 1.7" (4.4 cm) | October 8, 1979 |
| Earliest Measurable Snow | 1.7" (4.4 cm) | October 8, 1979 |
| Latest Snow | 0.2" (0.4 cm) | May 26, 1994 |
| Latest Measurable Snow | 0.2" (0.4 cm) | May 26, 1994 |
| Period of Record | ||
| Temperature | November 1, 1889 – April 1, 2024 | |
| Precipitation | November 1, 1889 – April 1, 2024 | |
| Snowfall | November 1, 1889 – April 1, 2024 | |
Note: Records compiled from NOAA GHCN-Daily observations at OTTAWA CDA (3 mi from Ottawa, Canada). 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 Ottawa, Canada?
The all-time record high in Ottawa, Canada is 100°F (38°C), set on July 4, 1913 and July 30, 1916 and August 1, 1917.
What is the coldest temperature ever recorded in Ottawa, Canada?
The all-time record low in Ottawa, Canada is -38°F (-39°C), set on December 29, 1933.
What is the most rain Ottawa, Canada has ever had in one day?
The most precipitation recorded in one calendar day near Ottawa, Canada is 4.28 inches, on September 9, 2004.
What is the biggest snowfall ever recorded in Ottawa, Canada?
The most snow recorded in one calendar day near Ottawa, Canada is 22.0 inches, on January 29, 1894.
Ottawa Weather History
Monthly averages and climate data for Ottawa
Canada Weather History
Historical weather for other Canada cities