Gilroy Weather in December
Average highs run from 63°F on December 1 to 60°F on December 31, and lows from 38°F to 37°F. Normal precipitation for the month is 3.69 in over about 9 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
- 60°F
- Average low
- 37°F
- Precipitation
- 3.69 in
- Record high
- 80°FDec 1, 2021
- Record low
- 17°FDec 22, 1990
- Chance of a freeze
- 90%
- Daylight
- 9 h 49 min to 9 h 41 min
- Cloud cover
- 52%
- Humidity
- 76%
- Dew point
- 39°F
- Wind
- 6.0 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 | 63°F | 38°F | 80°F 2021 | 27°F 1957 | 26% |
| Dec 2 | 63°F | 38°F | 76°F 1959 | 26°F 1990 | 27% |
| Dec 3 | 62°F | 38°F | 75°F 1959 | 25°F 1957 | 27% |
| Dec 4 | 62°F | 38°F | 79°F 1958 | 27°F 1990 | 27% |
| Dec 5 | 62°F | 38°F | 79°F 1958 | 24°F 2013 | 28% |
| Dec 6 | 62°F | 38°F | 73°F 1959 | 25°F 2013 | 28% |
| Dec 7 | 61°F | 37°F | 72°F 1979 | 25°F 1960 | 28% |
| Dec 8 | 61°F | 37°F | 76°F 1977 | 23°F 1978 | 28% |
| Dec 9 | 61°F | 37°F | 73°F 1975 | 20°F 1972 | 29% |
| Dec 10 | 61°F | 37°F | 74°F 1990 | 23°F 1978 | 29% |
| Dec 11 | 61°F | 37°F | 72°F 1988 | 18°F 1972 | 29% |
| Dec 12 | 60°F | 37°F | 74°F 1958 | 22°F 1972 | 29% |
| Dec 13 | 60°F | 37°F | 78°F 1958 | 26°F 1972 | 29% |
| Dec 14 | 60°F | 37°F | 72°F 1958 | 25°F 1972 | 29% |
| Dec 15 | 60°F | 37°F | 79°F 1958 | 26°F 1964 | 29% |
| Dec 16 | 60°F | 37°F | 75°F 1958 | 25°F 1965 | 29% |
| Dec 17 | 60°F | 37°F | 76°F 1980 | 23°F 1965 | 29% |
| Dec 18 | 60°F | 37°F | 75°F 1958 | 23°F 1965 | 30% |
| Dec 19 | 60°F | 37°F | 73°F 1958 | 26°F 1971 | 30% |
| Dec 20 | 60°F | 37°F | 73°F 1999 | 25°F 1965 | 30% |
| Dec 21 | 60°F | 37°F | 75°F 1999 | 22°F 1968 | 30% |
| Dec 22 | 60°F | 37°F | 71°F 1999 | 17°F 1990 | 30% |
| Dec 23 | 60°F | 37°F | 71°F 1999 | 17°F 1990 | 30% |
| Dec 24 | 60°F | 37°F | 72°F 1999 | 17°F 1990 | 29% |
| Dec 25 | 60°F | 37°F | 75°F 2005 | 20°F 1990 | 29% |
| Dec 26 | 60°F | 37°F | 72°F 2013 | 20°F 2015 | 29% |
| Dec 27 | 60°F | 37°F | 75°F 1980 | 24°F 1990 | 30% |
| Dec 28 | 60°F | 37°F | 73°F 1999 | 25°F 1966 | 30% |
| Dec 29 | 60°F | 37°F | 71°F 1967 | 24°F 1990 | 30% |
| Dec 30 | 60°F | 37°F | 72°F 1975 | 20°F 1990 | 30% |
| Dec 31 | 60°F | 37°F | 70°F 2013 | 21°F 1978 | 30% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:01 AM, sunset 4:50 PM
- December 31
- sunrise 7:19 AM, sunset 5:00 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00043417 (Gilroy), public domain. Records: NOAA GHCN-Daily, station USC00043417, 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.