Rio Grande Weather in December

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

Average highs run from 23°C on December 1 to 25°C on December 31, and lows from 19°C to 21°C. Normal precipitation for the month is 92 mm over about 10 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: 20°C
Precipitation: 92 mm
Reanalysis high: 36°CDec 18, 1995
Reanalysis low: 14°CDec 1, 2011
Daylight: 14 h 05 min to 14 h 13 min
Cloud cover: 54%
Humidity: 78%
Dew point: 18°C
Wind: 22.0 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	23°C	19°C	28°C 1995	14°C 2011	31%
Dec 2	23°C	19°C	29°C 1994	16°C 2018	30%
Dec 3	23°C	19°C	27°C 2012	15°C 2018	29%
Dec 4	23°C	19°C	30°C 1996	16°C 2009	29%
Dec 5	23°C	19°C	27°C 2002	16°C 2008	29%
Dec 6	23°C	19°C	30°C 2012	16°C 1999	28%
Dec 7	23°C	19°C	29°C 2014	16°C 2015	29%
Dec 8	23°C	19°C	29°C 1998	16°C 2018	29%
Dec 9	23°C	20°C	29°C 2000	15°C 2001	30%
Dec 10	24°C	20°C	31°C 2019	16°C 2001	31%
Dec 11	24°C	20°C	33°C 2020	17°C 2005	30%
Dec 12	24°C	20°C	30°C 1994	16°C 2010	30%
Dec 13	24°C	20°C	31°C 1994	16°C 2010	30%
Dec 14	24°C	20°C	29°C 2018	16°C 2010	31%
Dec 15	24°C	20°C	29°C 2006	16°C 2016	32%
Dec 16	24°C	20°C	30°C 1995	16°C 2003	34%
Dec 17	24°C	20°C	30°C 2017	15°C 2003	35%
Dec 18	24°C	20°C	36°C 1995	18°C 2003	35%
Dec 19	24°C	20°C	29°C 1996	18°C 1992	35%
Dec 20	24°C	20°C	28°C 2014	17°C 1993	34%
Dec 21	24°C	21°C	27°C 1995	16°C 1993	34%
Dec 22	25°C	21°C	29°C 2005	17°C 2019	36%
Dec 23	25°C	21°C	28°C 2016	17°C 2019	35%
Dec 24	25°C	21°C	31°C 2012	18°C 2003	34%
Dec 25	25°C	21°C	31°C 2019	18°C 2017	34%
Dec 26	25°C	21°C	31°C 2013	19°C 2004	34%
Dec 27	25°C	21°C	32°C 2013	19°C 1997	34%
Dec 28	25°C	21°C	29°C 2008	18°C 2003	33%
Dec 29	25°C	21°C	32°C 2013	17°C 2003	32%
Dec 30	25°C	21°C	32°C 2013	18°C 2003	32%
Dec 31	25°C	21°C	30°C 2019	17°C 2003	31%

Chance of rain

Chance of a wet day

Sunrise and sunset

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

December 1: sunrise 5:15 AM, sunset 7:20 PM
December 31: sunrise 5:25 AM, sunset 7:38 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 2026-09-27. Sun and moon: computed with the NOAA solar equations and Meeus.