Historical Weather in Ottawa, Canada
See 55+ years of weather history for any date in Ottawa going back to 1970.
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Monthly Climate Averages
Historical temperature and precipitation averages for Ottawa, Canada, based on 55+ years of weather data.
Temperatures shown in Celsius with Fahrenheit in parentheses. Rainfall in millimetres, snowfall in centimetres.
Ottawa Weather by Month
January in Ottawa has become 2.0°C (3.5°F) warmer on average: the 2012–2026 average against 1970–1989.
Ottawa's hottest February day on record is a recent one: 15°C (59°F) on February 28, 2024.
Snow falls on about 7.3 days in a typical March.
The April heat record, 31°C (88°F) on April 27, 1990, has stood for 36 years.
The coldest May reading, -3°C (27°F) on May 1, 1978, has not been matched in 48 years.
The June heat record, 35°C (96°F) on June 14, 1988, has stood for 38 years.
5 of the 10 warmest Julys on record in Ottawa have come since 2012.
The coldest August reading, 3°C (37°F) on August 31, 1976, has not been matched in 50 years.
September in Ottawa has become 1.3°C (2.4°F) warmer on average: the 2011–2025 average against 1970–1989.
6 of the 10 warmest Octobers on record in Ottawa have come since 2011.
Snow falls on about 4.9 days in a typical November.
December in Ottawa has become 2.6°C (4.7°F) warmer on average: the 2011–2025 average against 1970–1989.
Source: NOAA GHCN-Daily, Ottawa Cda (1971–2023); Ottawa Cda Rcs (2000–2026). Records through 2026.