Portland Weather in December
Average highs run from 34°F on December 1 to 25°F on December 31, and lows from 21°F to 13°F. Normal precipitation for the month is 1.28 in over about 8 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
- 29°F
- Average low
- 17°F
- Precipitation
- 1.28 in
- Snowfall
- 8.2 in
- Record high
- 64°FDec 16, 2021
- Record low
- -36°FDec 19, 1983
- Chance of a freeze
- 100%
- Daylight
- 9 h 10 min to 8 h 59 min
- Cloud cover
- 67%
- Humidity
- 89%
- Dew point
- 17°F
- Wind
- 10.7 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 | 34°F | 21°F | 59°F 1962 | -17°F 1893 | 30% | 18% |
| Dec 2 | 34°F | 21°F | 63°F 1982 | -14°F 1976 | 30% | 19% |
| Dec 3 | 34°F | 21°F | 58°F 1962 | -19°F 1940 | 29% | 19% |
| Dec 4 | 33°F | 20°F | 60°F 2001 | -18°F 1940 | 29% | 20% |
| Dec 5 | 33°F | 20°F | 63°F 2001 | -8°F 1984 | 29% | 20% |
| Dec 6 | 32°F | 20°F | 52°F 1948 | -13°F 1985 | 29% | 20% |
| Dec 7 | 32°F | 19°F | 50°F 1894 | -19°F 1972 | 29% | 20% |
| Dec 8 | 32°F | 19°F | 55°F 1946 | -17°F 1976 | 29% | 21% |
| Dec 9 | 31°F | 19°F | 59°F 1946 | -14°F 1958 | 28% | 21% |
| Dec 10 | 31°F | 18°F | 56°F 1946 | -22°F 1919 | 28% | 21% |
| Dec 11 | 31°F | 18°F | 54°F 2015 | -15°F 1972 | 28% | 21% |
| Dec 12 | 30°F | 18°F | 54°F 1913 | -17°F 1985 | 28% | 21% |
| Dec 13 | 30°F | 17°F | 52°F 1968 | -27°F 1903 | 28% | 22% |
| Dec 14 | 30°F | 17°F | 55°F 1975 | -26°F 1901 | 28% | 22% |
| Dec 15 | 30°F | 17°F | 50°F 2021 | -26°F 1901 | 27% | 22% |
| Dec 16 | 29°F | 17°F | 64°F 2021 | -18°F 1932 | 27% | 22% |
| Dec 17 | 29°F | 16°F | 52°F 1962 | -22°F 1985 | 27% | 22% |
| Dec 18 | 29°F | 16°F | 51°F 1931 | -29°F 1983 | 27% | 23% |
| Dec 19 | 28°F | 16°F | 47°F 1923 | -36°F 1983 | 27% | 23% |
| Dec 20 | 28°F | 15°F | 50°F 1894 | -26°F 1983 | 27% | 23% |
| Dec 21 | 28°F | 15°F | 53°F 1967 | -25°F 1916 | 27% | 23% |
| Dec 22 | 28°F | 15°F | 50°F 1941 | -24°F 1983 | 27% | 23% |
| Dec 23 | 27°F | 15°F | 50°F 1957 | -27°F 1990 | 27% | 23% |
| Dec 24 | 27°F | 14°F | 50°F 1893 | -31°F 1983 | 27% | 23% |
| Dec 25 | 27°F | 14°F | 53°F 1936 | -25°F 1985 | 26% | 23% |
| Dec 26 | 27°F | 14°F | 53°F 1936 | -28°F 1962 | 26% | 23% |
| Dec 27 | 26°F | 14°F | 59°F 2008 | -22°F 1933 | 26% | 23% |
| Dec 28 | 26°F | 14°F | 58°F 1984 | -24°F 1924 | 26% | 23% |
| Dec 29 | 26°F | 13°F | 50°F 2019 | -17°F 1917 | 26% | 24% |
| Dec 30 | 26°F | 13°F | 51°F 2019 | -20°F 1976 | 26% | 24% |
| Dec 31 | 25°F | 13°F | 56°F 1965 | -24°F 1976 | 26% | 24% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:17 AM, sunset 4:27 PM
- December 31
- sunrise 7:37 AM, sunset 4:36 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00471280 (Cashton), public domain. Records: NOAA GHCN-Daily, station USC00478827, 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.