San Carlos Weather in December

NASA POWER reanalysis for the half-degree grid cell around San Carlos, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 22°C on December 1 to 25°C on December 31, and lows from 16°C to 19°C. Normal precipitation for the month is 90 mm over about 9 wet days.

December day by day

The normal high and low for each date, in °C.

Normal low
Normal high
Reanalysis extreme high
Reanalysis extreme low

December at a glance

Average high: 24°C
Average low: 17°C
Precipitation: 90 mm
Reanalysis high: 32°CDec 21, 1995
Reanalysis low: 12°CDec 2, 2005
Daylight: 14 h 19 min to 14 h 27 min
Cloud cover: 52%
Humidity: 75%
Dew point: 15°C
Wind: 20.2 km/h

Every day of the month

A wet day has at least 1 mm of precipitation in the reanalysis.

Date	Normal high	Normal low	Reanalysis high	Reanalysis low	Chance wet
Dec 1	22°C	16°C	27°C 1994	13°C 2005	30%
Dec 2	22°C	16°C	29°C 1996	12°C 2005	29%
Dec 3	22°C	16°C	28°C 1998	12°C 1992	29%
Dec 4	22°C	16°C	27°C 2007	13°C 2009	29%
Dec 5	22°C	16°C	27°C 2002	13°C 2009	29%
Dec 6	23°C	16°C	30°C 1995	12°C 1993	29%
Dec 7	23°C	16°C	29°C 2008	12°C 2018	29%
Dec 8	23°C	16°C	29°C 2008	12°C 2018	28%
Dec 9	23°C	17°C	29°C 1994	12°C 2001	30%
Dec 10	23°C	17°C	30°C 2012	12°C 2001	29%
Dec 11	23°C	17°C	30°C 1994	12°C 2005	28%
Dec 12	23°C	17°C	31°C 2015	13°C 2007	28%
Dec 13	23°C	17°C	29°C 2000	13°C 2010	30%
Dec 14	23°C	17°C	28°C 2007	15°C 2016	31%
Dec 15	23°C	17°C	29°C 2010	12°C 2000	33%
Dec 16	24°C	17°C	31°C 2017	13°C 2000	34%
Dec 17	24°C	17°C	30°C 2013	13°C 2003	34%
Dec 18	24°C	17°C	30°C 2016	14°C 2017	33%
Dec 19	24°C	17°C	28°C 2014	14°C 2000	33%
Dec 20	24°C	18°C	29°C 2014	13°C 1993	33%
Dec 21	24°C	18°C	32°C 1995	13°C 1993	32%
Dec 22	24°C	18°C	29°C 2010	14°C 2020	32%
Dec 23	24°C	18°C	30°C 2006	14°C 2000	32%
Dec 24	24°C	18°C	30°C 2013	13°C 2000	31%
Dec 25	24°C	18°C	30°C 2013	15°C 2005	31%
Dec 26	24°C	18°C	31°C 2013	15°C 2005	32%
Dec 27	25°C	18°C	30°C 1998	16°C 2005	31%
Dec 28	25°C	18°C	30°C 2015	16°C 2012	31%
Dec 29	25°C	18°C	31°C 2006	15°C 2008	31%
Dec 30	25°C	19°C	31°C 2013	14°C 2008	31%
Dec 31	25°C	19°C	30°C 1994	15°C 2003	30%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT-3).

December 1: sunrise 5:19 AM, sunset 7:38 PM
December 31: sunrise 5:29 AM, sunset 7:56 PM

Every day of December: sun and moon

Other months

Sources

Cloud, humidity, wind and sunshine, and temperature and precipitation: 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.