Roslyn Weather in December
Average highs run from 37°F on December 1 to 33°F on December 31, and lows from 25°F to 21°F. Normal precipitation for the month is 3.50 in.
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
- 34°F
- Average low
- 22°F
- Precipitation
- 3.50 in
- Record high
- 64°FDec 16, 1980
- Record low
- -21°FDec 30, 1968
- Chance of a freeze
- 100%
- Daylight
- 8 h 46 min to 8 h 33 min
- Cloud cover
- 72%
- Humidity
- 96%
- Dew point
- 24°F
- Wind
- 5.1 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 37°F | 25°F | 56°F 2008 | -2°F 1985 | |
| Dec 2 | 37°F | 24°F | 48°F 1958 | 5°F 1985 | |
| Dec 3 | 37°F | 24°F | 47°F 2007 | 8°F 1972 | |
| Dec 4 | 37°F | 24°F | 45°F 1944 | 3°F 1972 | |
| Dec 5 | 36°F | 24°F | 54°F 2008 | 1°F 1972 | |
| Dec 6 | 36°F | 24°F | 51°F 2008 | 1°F 1956 | |
| Dec 7 | 36°F | 23°F | 44°F 1962 | -4°F 1972 | |
| Dec 8 | 35°F | 23°F | 52°F 1979 | -4°F 1972 | |
| Dec 9 | 35°F | 23°F | 53°F 1957 | -2°F 1972 | |
| Dec 10 | 35°F | 23°F | 50°F 2004 | -2°F 1972 | |
| Dec 11 | 35°F | 23°F | 48°F 2025 | 2°F 1972 | |
| Dec 12 | 35°F | 23°F | 45°F 1952 | 4°F 1972 | |
| Dec 13 | 34°F | 22°F | 51°F 2025 | 8°F 2000 | |
| Dec 14 | 34°F | 22°F | 48°F 1980 | 6°F 1972 | |
| Dec 15 | 34°F | 22°F | 53°F 1980 | 6°F 1964 | |
| Dec 16 | 34°F | 22°F | 64°F 1980 | -15°F 1964 | |
| Dec 17 | 34°F | 22°F | 50°F 2009 | -16°F 1964 | |
| Dec 18 | 34°F | 22°F | 51°F 2004 | -9°F 1964 | |
| Dec 19 | 33°F | 22°F | 44°F 2004 | -2°F 1984 | |
| Dec 20 | 33°F | 22°F | 47°F 2023 | -2°F 1998 | |
| Dec 21 | 33°F | 22°F | 45°F 2023 | -4°F 1983 | |
| Dec 22 | 33°F | 21°F | 50°F 1985 | -8°F 1983 | |
| Dec 23 | 33°F | 21°F | 48°F 1950 | -15°F 1983 | |
| Dec 24 | 33°F | 21°F | 47°F 1993 | -9°F 1983 | |
| Dec 25 | 33°F | 21°F | 48°F 1980 | 0°F 1983 | |
| Dec 26 | 33°F | 21°F | 51°F 1956 | 5°F 1996 | |
| Dec 27 | 33°F | 21°F | 53°F 1956 | 3°F 1948 | |
| Dec 28 | 33°F | 21°F | 44°F 1956 | -8°F 1968 | |
| Dec 29 | 33°F | 21°F | 45°F 1975 | -18°F 1968 | |
| Dec 30 | 33°F | 21°F | 46°F 1997 | -21°F 1968 | |
| Dec 31 | 33°F | 21°F | 43°F 1963 | -16°F 1968 |
Chance of rain
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:30 AM, sunset 4:16 PM
- December 31
- sunrise 7:51 AM, sunset 4:24 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00451504 (Cle Elum), public domain. Records: NOAA GHCN-Daily, station USW00024237, 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.