Los Altos Weather in December
Average highs run from 59°F on December 1 to 57°F on December 31, and lows from 40°F to 38°F. Normal precipitation for the month is 2.95 in over about 10 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
- 58°F
- Average low
- 39°F
- Precipitation
- 2.95 in
- Record high
- 78°FDec 5, 2003
- Record low
- 23°FDec 23, 1990
- Chance of a freeze
- 75%
- Daylight
- 9 h 47 min to 9 h 38 min
- Cloud cover
- 52%
- Humidity
- 80%
- Dew point
- 41°F
- Wind
- 6.7 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 | 59°F | 40°F | 73°F 1959 | 34°F 2004 | 27% |
| Dec 2 | 59°F | 40°F | 75°F 1958 | 32°F 1948 | 27% |
| Dec 3 | 59°F | 40°F | 72°F 1958 | 34°F 1976 | 28% |
| Dec 4 | 59°F | 39°F | 71°F 2003 | 31°F 2004 | 28% |
| Dec 5 | 59°F | 39°F | 78°F 2003 | 29°F 2013 | 28% |
| Dec 6 | 58°F | 39°F | 71°F 1989 | 33°F 2013 | 29% |
| Dec 7 | 58°F | 39°F | 71°F 1975 | 34°F 1947 | 29% |
| Dec 8 | 58°F | 39°F | 72°F 1988 | 31°F 1951 | 29% |
| Dec 9 | 58°F | 39°F | 70°F 2015 | 28°F 1951 | 30% |
| Dec 10 | 58°F | 39°F | 69°F 1958 | 29°F 1972 | 30% |
| Dec 11 | 58°F | 39°F | 74°F 1958 | 29°F 1972 | 30% |
| Dec 12 | 58°F | 39°F | 75°F 1958 | 27°F 1949 | 30% |
| Dec 13 | 58°F | 39°F | 68°F 1953 | 29°F 1945 | 31% |
| Dec 14 | 57°F | 39°F | 72°F 1988 | 27°F 1945 | 31% |
| Dec 15 | 57°F | 38°F | 73°F 1980 | 30°F 1948 | 31% |
| Dec 16 | 57°F | 38°F | 71°F 1998 | 33°F 1965 | 31% |
| Dec 17 | 57°F | 38°F | 72°F 2025 | 29°F 1965 | 31% |
| Dec 18 | 57°F | 38°F | 65°F 1958 | 30°F 1965 | 31% |
| Dec 19 | 57°F | 38°F | 72°F 1969 | 31°F 1948 | 31% |
| Dec 20 | 57°F | 38°F | 76°F 1969 | 32°F 1949 | 31% |
| Dec 21 | 57°F | 38°F | 70°F 1999 | 27°F 1949 | 31% |
| Dec 22 | 57°F | 38°F | 68°F 1999 | 25°F 1990 | 31% |
| Dec 23 | 57°F | 38°F | 69°F 2014 | 23°F 1990 | 31% |
| Dec 24 | 57°F | 38°F | 71°F 2013 | 26°F 1990 | 31% |
| Dec 25 | 57°F | 38°F | 72°F 1967 | 28°F 1990 | 31% |
| Dec 26 | 57°F | 38°F | 75°F 1967 | 31°F 1949 | 31% |
| Dec 27 | 57°F | 38°F | 75°F 1967 | 29°F 2015 | 31% |
| Dec 28 | 57°F | 38°F | 72°F 1967 | 30°F 1966 | 31% |
| Dec 29 | 57°F | 38°F | 68°F 1975 | 31°F 1949 | 31% |
| Dec 30 | 57°F | 38°F | 68°F 1989 | 28°F 1990 | 31% |
| Dec 31 | 57°F | 38°F | 68°F 1958 | 30°F 1947 | 31% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:04 AM, sunset 4:51 PM
- December 31
- sunrise 7:23 AM, sunset 5:01 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00046646 (Palo Alto), public domain. Records: NOAA GHCN-Daily, station USW00023244, 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.