Ottawa Weather in December
Average highs run from 48°F on December 1 to 40°F on December 31, and lows from 26°F to 19°F. Normal precipitation for the month is 1.71 in over about 6 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 43°F
- Average low
- 22°F
- Precipitation
- 1.71 in
- Snowfall
- 2.6 in
- Record high
- 75°FDec 6, 1939
- Record low
- -22°FDec 23, 1989
- Chance of a freeze
- 100%
- Daylight
- 9 h 40 min to 9 h 31 min
- Cloud cover
- 58%
- Humidity
- 80%
- Dew point
- 26°F
- Wind
- 11.0 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 48°F | 26°F | 70°F 1970 | 5°F 1985 | 20% | 4% |
| Dec 2 | 48°F | 26°F | 73°F 1956 | 1°F 1919 | 20% | 4% |
| Dec 3 | 47°F | 26°F | 74°F 2021 | 4°F 1895 | 20% | 4% |
| Dec 4 | 47°F | 25°F | 72°F 2012 | 5°F 1898 | 20% | 4% |
| Dec 5 | 47°F | 25°F | 74°F 2001 | 2°F 1898 | 20% | 4% |
| Dec 6 | 46°F | 25°F | 75°F 1939 | -2°F 1950 | 20% | 5% |
| Dec 7 | 46°F | 24°F | 74°F 1966 | -2°F 1909 | 21% | 5% |
| Dec 8 | 46°F | 24°F | 71°F 1966 | -8°F 1909 | 21% | 5% |
| Dec 9 | 45°F | 24°F | 68°F 1940 | -13°F 2005 | 21% | 5% |
| Dec 10 | 45°F | 24°F | 70°F 2020 | -8°F 1919 | 21% | 5% |
| Dec 11 | 45°F | 23°F | 70°F 1939 | -2°F 1917 | 21% | 6% |
| Dec 12 | 44°F | 23°F | 66°F 1968 | -8°F 1932 | 21% | 6% |
| Dec 13 | 44°F | 23°F | 70°F 1921 | -10°F 1961 | 21% | 6% |
| Dec 14 | 44°F | 23°F | 69°F 1933 | -10°F 1898 | 21% | 6% |
| Dec 15 | 43°F | 22°F | 69°F 1984 | -14°F 1989 | 21% | 6% |
| Dec 16 | 43°F | 22°F | 73°F 2021 | -13°F 1989 | 21% | 6% |
| Dec 17 | 43°F | 22°F | 70°F 1939 | 0°F 1901 | 21% | 6% |
| Dec 18 | 43°F | 22°F | 68°F 1966 | -8°F 2016 | 21% | 7% |
| Dec 19 | 42°F | 22°F | 65°F 1978 | -11°F 1983 | 21% | 7% |
| Dec 20 | 42°F | 21°F | 65°F 1949 | -12°F 1983 | 21% | 7% |
| Dec 21 | 42°F | 21°F | 63°F 1941 | -9°F 1989 | 21% | 7% |
| Dec 22 | 42°F | 21°F | 68°F 1933 | -21°F 1989 | 21% | 7% |
| Dec 23 | 41°F | 21°F | 67°F 1982 | -22°F 1989 | 21% | 7% |
| Dec 24 | 41°F | 21°F | 72°F 1955 | -14°F 1983 | 21% | 7% |
| Dec 25 | 41°F | 20°F | 71°F 2021 | -15°F 1983 | 21% | 7% |
| Dec 26 | 41°F | 20°F | 69°F 2025 | -7°F 1962 | 21% | 7% |
| Dec 27 | 41°F | 20°F | 73°F 1946 | -2°F 1925 | 21% | 7% |
| Dec 28 | 40°F | 20°F | 70°F 1984 | -10°F 1924 | 21% | 7% |
| Dec 29 | 40°F | 20°F | 70°F 1999 | -8°F 1917 | 21% | 7% |
| Dec 30 | 40°F | 20°F | 70°F 2004 | -15°F 1983 | 21% | 8% |
| Dec 31 | 40°F | 19°F | 70°F 1951 | -7°F 1968 | 21% | 8% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:20 AM, sunset 5:00 PM
- December 31
- sunrise 7:39 AM, sunset 5:10 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00146128 (Ottawa), public domain. Records: NOAA GHCN-Daily, station USC00146128, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.