San Martin Weather in December

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

Average highs run from 33°C on December 1 to 34°C on December 31, and lows from 20°C to 22°C. Normal precipitation for the month is 12 mm over about 3 wet days.

December day by day

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

Normal low
Normal high
Record high
Record low

December at a glance

Average high: 33°C
Average low: 21°C
Precipitation: 12 mm
Record high: 37°CDec 17, 1982
Record low: 11°CDec 18, 1975
Daylight: 12 h 24 min to 12 h 25 min
Cloud cover: 63%
Humidity: 61%
Dew point: 17°C
Wind: 18.7 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	Record high	Record low	Chance wet
Dec 1	33°C	20°C	34°C 1976	13°C 1967	4%
Dec 2	33°C	20°C	34°C 1991	13°C 1963	4%
Dec 3	33°C	20°C	34°C 1969	14°C 1963	3%
Dec 4	33°C	20°C	35°C 1982	14°C 1967	4%
Dec 5	33°C	20°C	33°C 1999	13°C 1973	4%
Dec 6	33°C	20°C	33°C 1982	14°C 1963	4%
Dec 7	33°C	20°C	34°C 1997	14°C 1963	5%
Dec 8	33°C	20°C	36°C 1969	14°C 1967	6%
Dec 9	33°C	20°C	36°C 1982	13°C 1973	6%
Dec 10	33°C	20°C	35°C 2015	12°C 1973	6%
Dec 11	33°C	20°C	35°C 1982	15°C 1966	6%
Dec 12	33°C	20°C	34°C 1982	15°C 1995	7%
Dec 13	33°C	20°C	36°C 1986	15°C 1975	7%
Dec 14	33°C	20°C	37°C 1982	15°C 1966	7%
Dec 15	33°C	20°C	36°C 1986	14°C 1966	7%
Dec 16	33°C	21°C	36°C 1986	15°C 1966	7%
Dec 17	33°C	21°C	37°C 1982	12°C 1986	7%
Dec 18	33°C	21°C	36°C 1976	11°C 1975	7%
Dec 19	33°C	21°C	36°C 1982	16°C 1966	8%
Dec 20	34°C	21°C	35°C 1986	15°C 1966	8%
Dec 21	34°C	21°C	35°C 2015	14°C 1966	8%
Dec 22	34°C	21°C	34°C 1964	15°C 1989	9%
Dec 23	34°C	21°C	36°C 1986	15°C 1967	8%
Dec 24	34°C	21°C	35°C 2015	15°C 1967	8%
Dec 25	34°C	21°C	35°C 1963	16°C 1973	8%
Dec 26	34°C	21°C	35°C 2015	14°C 1967	8%
Dec 27	34°C	21°C	35°C 2015	17°C 1979	7%
Dec 28	34°C	21°C	35°C 1992	17°C 1980	7%
Dec 29	34°C	21°C	36°C 1982	16°C 1967	8%
Dec 30	34°C	21°C	36°C 1986	17°C 1981	8%
Dec 31	34°C	22°C	36°C 1982	16°C 1967	10%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT-5).

December 1: sunrise 6:00 AM, sunset 6:24 PM
December 31: sunrise 6:13 AM, sunset 6:38 PM

Every day of December: sun and moon

Other months

Sources

Records: NOAA GHCN-Daily, station PEM00084401, every year on file, quality-flagged values removed. 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.