Calgary Weather in December
In December, Calgary averages a high of -1°C (30°F) and a low of -12°C (10°F), from 54 years of daily records (1971–2026).
-1°C
Average high
30°F
-12°C
Average low
10°F
20°C
Record high
68°F · December 27, 1999
-38°C
Record low
-37°F · December 28, 1996
What December Is Like in Calgary
- The coldest December reading, -38°C (-37°F) on December 28, 1996, has not been matched in 30 years.
- Snow falls on about 6.8 days in a typical December.
- The warmest December in the record was 2023; the coldest was 1983.
At least 1 mm of rain falls on 12% of December days, and the month averages 13 mm in total.
Warmest: 1999 (6.7°C)Latest: 2025 (-0.9°C)10-year averageLong-run average (-1.3°C)
Look Up a Day in December
See the weather in Calgary on any December date, year by year.
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). Averages cover 1971–2026. How we compute this