Weather on December 21 in Ottawa
Historical weather data for December 21 in Ottawa, Canada
Based on 54 years of data from OTTAWA CDA
About This Date
December 21st in Ottawa, Canada typically brings very cold winter weather, with average highs around -3°C and lows near -11°C. Over 54 years of records, the warmest December 21st was in 1994 (4°C average), while the coldest was 1989 (-22°C) — a 46°F range across recorded history. Precipitation has occurred on 50% of recorded December 21st dates, with snow falling 43% of the time (heaviest snowfall: 9.7"). The last decade has been 6.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.8°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Ottawa? Bundle up with warm layers and protect extremities from the cold. Consider bringing rain gear or an umbrella. Check road conditions if traveling, as snow is possible.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 2°C (36°F) | -8°C (18°F) | -- |
| 2023 | -4°C (24°F) | -10°C (14°F) | 0" |
| 2022 | -1°C (31°F) | -12°C (11°F) | 0" |
| 2021 | -1°C (30°F) | -4°C (25°F) | 0.04" |
| 2020 | 4°C (39°F) | -2°C (29°F) | 0" |
| 2019 | -8°C (18°F) | -14°C (7°F) | 0" |
| 2018 | 4°C (40°F) | 0°C (32°F) | 4.23" |
| 2017 | -11°C (13°F) | -14°C (6°F) | 0" |
| 2016 | 4°C (39°F) | -6°C (21°F) | 0.44" |
| 2015 | -- | -3°C (26°F) | -- |
| 2014 | -7°C (19°F) | -11°C (12°F) | 0" |
| 2013 | -5°C (23°F) | -7°C (19°F) | 1.8" |
| 2012 | 1°C (34°F) | -2°C (28°F) | 1.99" |
| 2011 | 1°C (33°F) | -7°C (19°F) | 1.09" |
| 2010 | -3°C (26°F) | -6°C (21°F) | 0" |
| 2009 | -8°C (17°F) | -14°C (6°F) | 0" |
| 2008 | -12°C (11°F) | -19°C (-2°F) | 0.63" |
| 2007 | -5°C (23°F) | -7°C (19°F) | 0" |
| 2006 | 4°C (40°F) | -3°C (26°F) | 0" |
| 2005 | -11°C (13°F) | -22°C (-7°F) | 0.6" |
| 2004 | -11°C (12°F) | -26°C (-15°F) | 0.06" |
| 2003 | 1°C (34°F) | -17°C (2°F) | 0.08" |
| 2002 | 2°C (36°F) | 0°C (32°F) | 0" |
| 2001 | -2°C (29°F) | -3°C (26°F) | 0" |
| 2000 | -10°C (14°F) | -17°C (2°F) | -- |
| 1999 | -1°C (30°F) | -3°C (26°F) | 0" |
| 1998 | 1°C (33°F) | -8°C (18°F) | 2" |
| 1997 | -9°C (16°F) | -16°C (3°F) | 0" |
| 1996 | -2°C (29°F) | -11°C (13°F) | 0.02" |
| 1995 | -4°C (24°F) | -13°C (8°F) | 0" |
| 1994 | 7°C (45°F) | 1°C (33°F) | 0" |
| 1993 | 1°C (34°F) | 0°C (32°F) | 1.86" |
| 1992 | -3°C (26°F) | -12°C (11°F) | 0" |
| 1991 | 3°C (37°F) | -3°C (26°F) | 0.03" |
| 1990 | 1°C (34°F) | -14°C (7°F) | 1.54" |
| 1989 | -19°C (-2°F) | -24°C (-12°F) | 0" |
| 1988 | 4°C (40°F) | -1°C (31°F) | 0" |
| 1987 | 3°C (37°F) | -1°C (31°F) | 0" |
| 1986 | -3°C (26°F) | -13°C (9°F) | 0" |
| 1985 | -10°C (14°F) | -14°C (6°F) | 0.02" |
| 1984 | 4°C (39°F) | -14°C (7°F) | 0.85" |
| 1983 | -12°C (11°F) | -27°C (-16°F) | 0.66" |
| 1982 | -4°C (25°F) | -7°C (20°F) | 0.1" |
| 1981 | 0°C (32°F) | -15°C (5°F) | 0.08" |
| 1980 | -15°C (5°F) | -25°C (-13°F) | 0.06" |
| 1979 | -4°C (25°F) | -13°C (8°F) | 0" |
| 1978 | -5°C (23°F) | -14°C (7°F) | 0.02" |
| 1977 | -2°C (28°F) | -3°C (26°F) | 2.46" |
| 1976 | -14°C (6°F) | -16°C (3°F) | 0" |
| 1975 | -11°C (13°F) | -20°C (-4°F) | 0" |
| 1974 | -3°C (27°F) | -5°C (23°F) | 0.08" |
| 1973 | -8°C (18°F) | -10°C (14°F) | 0.13" |
| 1972 | -3°C (27°F) | -15°C (5°F) | 0.36" |
| 1971 | 3°C (37°F) | -7°C (19°F) | 0.08" |