Sisters Weather in December
Average highs run from 42°F on December 1 to 39°F on December 31, and lows from 22°F to 20°F. Normal precipitation for the month is 2.53 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
- 39°F
- Average low
- 20°F
- Precipitation
- 2.53 in
- Snowfall
- 3.4 in
- Record high
- 72°FDec 1, 2021
- Record low
- -28°FDec 8, 1972
- Chance of a freeze
- 100%
- Daylight
- 9 h 06 min to 8 h 55 min
- Cloud cover
- 72%
- Humidity
- 86%
- Dew point
- 27°F
- Wind
- 7.2 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 | 42°F | 22°F | 72°F 2021 | 0°F 2015 | 5% | |
| Dec 2 | 41°F | 21°F | 62°F 1958 | 3°F 1985 | 5% | |
| Dec 3 | 41°F | 21°F | 67°F 1965 | -1°F 1992 | 5% | |
| Dec 4 | 41°F | 21°F | 65°F 1989 | -9°F 1972 | 5% | |
| Dec 5 | 41°F | 21°F | 65°F 2023 | -15°F 1992 | 5% | |
| Dec 6 | 40°F | 21°F | 61°F 1959 | -2°F 1972 | 6% | |
| Dec 7 | 40°F | 21°F | 59°F 2024 | -24°F 2013 | 6% | |
| Dec 8 | 40°F | 20°F | 66°F 1990 | -28°F 1972 | 6% | |
| Dec 9 | 40°F | 20°F | 60°F 1957 | -22°F 1972 | 6% | |
| Dec 10 | 39°F | 20°F | 61°F 2025 | -25°F 1972 | 6% | |
| Dec 11 | 39°F | 20°F | 59°F 2025 | -11°F 1972 | 6% | |
| Dec 12 | 39°F | 20°F | 63°F 2025 | -8°F 1972 | 6% | |
| Dec 13 | 39°F | 20°F | 64°F 2025 | -7°F 1972 | 6% | |
| Dec 14 | 39°F | 20°F | 64°F 1962 | -6°F 1972 | 7% | |
| Dec 15 | 39°F | 19°F | 67°F 2025 | -6°F 1967 | 7% | |
| Dec 16 | 39°F | 19°F | 63°F 1980 | -12°F 2008 | 7% | |
| Dec 17 | 39°F | 19°F | 60°F 1976 | -12°F 1964 | 7% | |
| Dec 18 | 39°F | 19°F | 59°F 2004 | -6°F 1984 | 7% | |
| Dec 19 | 39°F | 19°F | 59°F 2024 | -8°F 1984 | 7% | |
| Dec 20 | 39°F | 19°F | 58°F 1994 | -13°F 1990 | 7% | |
| Dec 21 | 39°F | 19°F | 60°F 2020 | -24°F 1990 | 7% | |
| Dec 22 | 39°F | 19°F | 58°F 1960 | -18°F 1990 | 7% | |
| Dec 23 | 39°F | 19°F | 62°F 1950 | -13°F 1990 | 7% | |
| Dec 24 | 39°F | 19°F | 58°F 1950 | -9°F 1983 | 7% | |
| Dec 25 | 39°F | 19°F | 61°F 1980 | -2°F 1983 | 7% | |
| Dec 26 | 39°F | 19°F | 65°F 1980 | -2°F 1988 | 7% | |
| Dec 27 | 39°F | 19°F | 59°F 1967 | 7°F 1954 | 7% | |
| Dec 28 | 39°F | 19°F | 58°F 1997 | -3°F 1983 | 7% | |
| Dec 29 | 39°F | 19°F | 62°F 2017 | -13°F 1990 | 7% | |
| Dec 30 | 39°F | 20°F | 66°F 1980 | -8°F 1968 | 7% | |
| Dec 31 | 39°F | 20°F | 56°F 1963 | -20°F 1978 | 7% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:22 AM, sunset 4:28 PM
- December 31
- sunrise 7:42 AM, sunset 4:37 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00357857 (Sisters), public domain. Records: NOAA GHCN-Daily, station USW00024230, 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.