Arroyo Seco Weather in December

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

Average highs run from 30°C on December 1 to 33°C on December 31, and lows from 16°C to 19°C. Normal precipitation for the month is 140 mm over about 12 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: 32°C
Average low: 17°C
Precipitation: 140 mm
Reanalysis high: 43°CDec 18, 1995
Reanalysis low: 8°CDec 1, 1993
Daylight: 14 h 11 min to 14 h 18 min
Cloud cover: 50%
Humidity: 60%
Dew point: 15°C
Wind: 13.0 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	30°C	16°C	37°C 2007	8°C 1993	38%
Dec 2	30°C	16°C	37°C 2004	10°C 2018	36%
Dec 3	30°C	16°C	37°C 1995	11°C 2018	36%
Dec 4	31°C	16°C	38°C 1995	11°C 2009	36%
Dec 5	31°C	16°C	39°C 1995	10°C 2019	36%
Dec 6	31°C	16°C	38°C 1995	8°C 1999	37%
Dec 7	31°C	16°C	37°C 2017	10°C 1999	36%
Dec 8	31°C	16°C	39°C 2008	10°C 2001	36%
Dec 9	31°C	16°C	39°C 2017	9°C 2001	36%
Dec 10	31°C	16°C	40°C 1994	11°C 2005	36%
Dec 11	31°C	17°C	38°C 2019	11°C 2007	35%
Dec 12	31°C	17°C	39°C 2016	12°C 2010	35%
Dec 13	31°C	17°C	36°C 1995	10°C 2010	37%
Dec 14	31°C	17°C	37°C 2013	12°C 2016	39%
Dec 15	32°C	17°C	38°C 2017	10°C 2007	39%
Dec 16	32°C	17°C	42°C 2017	9°C 2000	40%
Dec 17	32°C	17°C	42°C 1995	11°C 2003	40%
Dec 18	32°C	17°C	43°C 1995	13°C 2017	40%
Dec 19	32°C	17°C	40°C 2011	10°C 2015	39%
Dec 20	32°C	17°C	41°C 1995	13°C 2002	39%
Dec 21	32°C	18°C	42°C 2011	12°C 1993	38%
Dec 22	32°C	18°C	39°C 2013	10°C 2019	37%
Dec 23	32°C	18°C	39°C 2013	12°C 2003	38%
Dec 24	32°C	18°C	40°C 2013	11°C 2000	38%
Dec 25	32°C	18°C	41°C 2013	11°C 2011	38%
Dec 26	32°C	18°C	41°C 2013	10°C 1991	37%
Dec 27	32°C	18°C	40°C 1999	12°C 1991	36%
Dec 28	32°C	19°C	38°C 2010	13°C 2003	35%
Dec 29	33°C	19°C	39°C 2020	12°C 2003	35%
Dec 30	33°C	19°C	39°C 2013	14°C 1993	35%
Dec 31	33°C	19°C	39°C 1994	13°C 2020	35%

Chance of rain

Chance of a wet day

Sunrise and sunset

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

December 1: sunrise 5:46 AM, sunset 7:57 PM
December 31: sunrise 5:56 AM, sunset 8:14 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.