Lake Oswego Weather in December
Average highs run from 48°F on December 1 to 45°F on December 31, and lows from 39°F to 37°F. Normal precipitation for the month is 7.35 in over about 20 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
- 46°F
- Average low
- 37°F
- Precipitation
- 7.35 in
- Snowfall
- 0.9 in
- Record high
- 67°FDec 4, 2023
- Record low
- 6°FDec 16, 1964
- Chance of a freeze
- 88%
- Daylight
- 8 h 59 min to 8 h 47 min
- Cloud cover
- 78%
- Humidity
- 92%
- Dew point
- 35°F
- Wind
- 6.5 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 | 39°F | 63°F 2021 | 20°F 1985 | 63% | 1% |
| Dec 2 | 48°F | 39°F | 62°F 1958 | 23°F 1985 | 63% | 1% |
| Dec 3 | 48°F | 39°F | 62°F 1979 | 27°F 2013 | 63% | 1% |
| Dec 4 | 47°F | 39°F | 67°F 2023 | 22°F 2013 | 63% | 1% |
| Dec 5 | 47°F | 38°F | 64°F 2023 | 19°F 2013 | 63% | 1% |
| Dec 6 | 47°F | 38°F | 60°F 1988 | 22°F 1959 | 63% | 2% |
| Dec 7 | 47°F | 38°F | 63°F 2015 | 15°F 2013 | 63% | 2% |
| Dec 8 | 47°F | 38°F | 62°F 2015 | 8°F 1972 | 64% | 2% |
| Dec 9 | 46°F | 38°F | 60°F 1987 | 12°F 2009 | 64% | 2% |
| Dec 10 | 46°F | 38°F | 65°F 1993 | 13°F 2009 | 64% | 2% |
| Dec 11 | 46°F | 38°F | 64°F 2014 | 14°F 2009 | 64% | 2% |
| Dec 12 | 46°F | 37°F | 63°F 1995 | 14°F 1972 | 64% | 2% |
| Dec 13 | 46°F | 37°F | 61°F 1977 | 18°F 1972 | 64% | 2% |
| Dec 14 | 46°F | 37°F | 60°F 2002 | 23°F 1972 | 64% | 2% |
| Dec 15 | 46°F | 37°F | 61°F 2025 | 22°F 2008 | 64% | 2% |
| Dec 16 | 45°F | 37°F | 60°F 1974 | 6°F 1964 | 64% | 2% |
| Dec 17 | 45°F | 37°F | 59°F 2025 | 7°F 1964 | 64% | 2% |
| Dec 18 | 45°F | 37°F | 60°F 2024 | 11°F 1964 | 64% | 2% |
| Dec 19 | 45°F | 37°F | 59°F 1953 | 14°F 1964 | 64% | 2% |
| Dec 20 | 45°F | 37°F | 59°F 1972 | 13°F 1967 | 64% | 2% |
| Dec 21 | 45°F | 37°F | 62°F 1940 | 12°F 1990 | 64% | 2% |
| Dec 22 | 45°F | 37°F | 60°F 1940 | 13°F 1990 | 64% | 2% |
| Dec 23 | 45°F | 37°F | 64°F 1950 | 11°F 1998 | 64% | 2% |
| Dec 24 | 45°F | 37°F | 60°F 1980 | 15°F 1983 | 64% | 3% |
| Dec 25 | 45°F | 37°F | 64°F 1980 | 19°F 1990 | 64% | 3% |
| Dec 26 | 45°F | 37°F | 63°F 1980 | 22°F 1962 | 64% | 3% |
| Dec 27 | 45°F | 37°F | 61°F 1980 | 23°F 1948 | 64% | 3% |
| Dec 28 | 45°F | 37°F | 58°F 1945 | 19°F 1978 | 64% | 3% |
| Dec 29 | 45°F | 37°F | 58°F 1950 | 14°F 1968 | 64% | 3% |
| Dec 30 | 45°F | 37°F | 60°F 1980 | 8°F 1968 | 64% | 3% |
| Dec 31 | 45°F | 37°F | 58°F 1980 | 9°F 1968 | 64% | 3% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:30 AM, sunset 4:29 PM
- December 31
- sunrise 7:50 AM, sunset 4:37 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00356749 (Portland Kgw-TV), public domain. Records: NOAA GHCN-Daily, station USW00024229, 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.