Weather on December 18 in Ottawa
Historical weather data for December 18 in Ottawa, Canada
Based on 54 years of data from OTTAWA CDA
About This Date
December 18th in Ottawa, Canada typically brings very cold winter weather, with average highs around -4°C and lows near -12°C. Over 54 years of records, the warmest December 18th was in 1996 (4°C average), while the coldest was 1979 (-19°C) — a 41°F range across recorded history. Precipitation has occurred on 48% of recorded December 18th dates, with snow falling 28% of the time (heaviest snowfall: 3.1"). The last decade has been 3.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.4°F cooler on this date compared to 20-30 years ago.
Planning for December 18th 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 | 3°C (38°F) | -9°C (15°F) | -- |
| 2023 | 7°C (44°F) | 1°C (33°F) | 2.84" |
| 2022 | -1°C (31°F) | -7°C (20°F) | 0" |
| 2021 | -1°C (30°F) | -7°C (20°F) | 0.59" |
| 2020 | -4°C (24°F) | -13°C (8°F) | 0" |
| 2019 | -4°C (25°F) | -21°C (-6°F) | 0.02" |
| 2018 | -6°C (21°F) | -13°C (9°F) | 0" |
| 2017 | -8°C (17°F) | -17°C (1°F) | 0.74" |
| 2016 | -6°C (22°F) | -20°C (-4°F) | 0.76" |
| 2015 | 3°C (38°F) | 2°C (35°F) | 0.06" |
| 2014 | 1°C (33°F) | -5°C (23°F) | 0.15" |
| 2013 | -8°C (17°F) | -17°C (1°F) | 0.11" |
| 2012 | 1°C (33°F) | 0°C (32°F) | 2.43" |
| 2011 | -4°C (24°F) | -14°C (7°F) | 0" |
| 2010 | -1°C (31°F) | -11°C (13°F) | 0.04" |
| 2009 | -11°C (13°F) | -25°C (-13°F) | 0" |
| 2008 | -3°C (26°F) | -8°C (17°F) | 0.02" |
| 2007 | -11°C (12°F) | -18°C (-1°F) | 0.14" |
| 2006 | 5°C (41°F) | -1°C (30°F) | 0" |
| 2005 | 0°C (32°F) | -9°C (15°F) | 0" |
| 2004 | 1°C (34°F) | -19°C (-3°F) | 0.15" |
| 2003 | -3°C (26°F) | -6°C (21°F) | 0.06" |
| 2002 | -3°C (26°F) | -16°C (4°F) | 0" |
| 2001 | 2°C (36°F) | -3°C (27°F) | 0.57" |
| 2000 | 1°C (33°F) | -12°C (11°F) | 0" |
| 1999 | -7°C (20°F) | -12°C (10°F) | 0" |
| 1998 | -4°C (24°F) | -11°C (13°F) | 0.04" |
| 1997 | 2°C (36°F) | -12°C (10°F) | 0" |
| 1996 | 6°C (42°F) | 3°C (37°F) | 0.02" |
| 1995 | -9°C (16°F) | -17°C (1°F) | 0" |
| 1994 | 2°C (36°F) | 1°C (33°F) | 0" |
| 1993 | -2°C (29°F) | -7°C (20°F) | 0.32" |
| 1992 | -2°C (28°F) | -4°C (24°F) | 0" |
| 1991 | -13°C (9°F) | -17°C (1°F) | 0" |
| 1990 | 1°C (34°F) | -5°C (23°F) | 1.29" |
| 1989 | -10°C (14°F) | -20°C (-4°F) | 0" |
| 1988 | -12°C (11°F) | -16°C (4°F) | 0.06" |
| 1987 | -4°C (24°F) | -8°C (17°F) | 0.5" |
| 1986 | 2°C (35°F) | -6°C (22°F) | 0.54" |
| 1985 | -18°C (0°F) | -20°C (-4°F) | 0" |
| 1984 | 2°C (35°F) | -1°C (30°F) | 0" |
| 1983 | -11°C (13°F) | -13°C (8°F) | 0.08" |
| 1982 | -8°C (18°F) | -16°C (3°F) | 0" |
| 1981 | -7°C (20°F) | -10°C (14°F) | 0" |
| 1980 | -3°C (27°F) | -27°C (-17°F) | 0.16" |
| 1979 | -17°C (1°F) | -21°C (-6°F) | 0" |
| 1978 | -12°C (10°F) | -17°C (2°F) | 0" |
| 1977 | -1°C (30°F) | -13°C (9°F) | 0" |
| 1976 | -9°C (15°F) | -13°C (9°F) | 0" |
| 1975 | -12°C (10°F) | -17°C (2°F) | 0" |
| 1974 | 1°C (34°F) | -4°C (24°F) | 0.03" |
| 1973 | -17°C (2°F) | -19°C (-3°F) | 0" |
| 1972 | -1°C (30°F) | -18°C (-1°F) | 0.1" |
| 1971 | -11°C (13°F) | -16°C (3°F) | 0" |