Ottawa Weather in December
In December, Ottawa averages a high of -2°C (28°F) and a low of -9°C (15°F), from 55 years of daily records (1971–2026).
-2°C
Average high
28°F
-9°C
Average low
15°F
16°C
Record high
60°F · December 6, 2001
-32°C
Record low
-26°F · December 25, 1980
What December Is Like in Ottawa
- December in Ottawa has become 2.6°C (4.7°F) warmer on average: the 2011–2025 average against 1970–1989.
- The coldest December reading, -32°C (-26°F) on December 25, 1980, has not been matched in 46 years.
- Snow falls on about 13 days in a typical December.
- The warmest December in the record was 2015; the coldest was 1989.
At least 1 mm of rain falls on 37% of December days, and the month averages 75 mm in total.
Warmest: 2015 (3.9°C)Latest: 2025 (-3.2°C)10-year averageLong-run average (-2.3°C)
Look Up a Day in December
See the weather in Ottawa on any December date, year by year.
Source: NOAA GHCN-Daily, Ottawa Cda (1971–2023); Ottawa Cda Rcs (2000–2026). Averages cover 1971–2026. How we compute this