Historical Weather in Calgary, Canada
See 55+ years of weather history for any date in Calgary going back to 1970.
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Monthly Climate Averages
Historical temperature and precipitation averages for Calgary, Canada, based on 55+ years of weather data.
Temperatures shown in Celsius with Fahrenheit in parentheses. Rainfall in millimetres, snowfall in centimetres.
Calgary Weather by Month
January in Calgary has become 2.8°C (5.1°F) warmer on average: the 2012–2026 average against 1970–1989.
The February heat record, 23°C (73°F) on February 27, 1992, has stood for 34 years.
Snow falls on about 8 days in a typical March.
The April heat record, 29°C (84°F) on April 25, 1977, has stood for 49 years.
6 of the 10 warmest Mays on record in Calgary have come since 2012.
5 of the 10 warmest Junes on record in Calgary have come since 2012.
July 2026 was the 2nd warmest July in 54 years of records, 2.7°C (4.8°F) above the long-run average.
August in Calgary has become 1.6°C (2.9°F) warmer on average: the 2012–2026 average against 1970–1989.
September 2025 was the warmest September in 54 years of records, 5.1°C (9.2°F) above the long-run average.
The October heat record, 28°C (82°F) on October 6, 1980, has stood for 46 years.
The coldest November reading, -34°C (-29°F) on November 27, 1985, has not been matched in 41 years.
The coldest December reading, -38°C (-37°F) on December 28, 1996, has not been matched in 30 years.
Source: NOAA GHCN-Daily, Calgary Int'L Cs (1999–2026); University Of Calgary (1971–1990); Calgary Int'L A (1980–2012); Calgary Glenmore Dam (1971–1978). Records through 2026.