Mercedes Weather in December

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

Average highs run from 32°C on December 1 to 34°C on December 31, and lows from 18°C to 20°C. Normal precipitation for the month is 161 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: 33°C
Average low: 19°C
Precipitation: 161 mm
Reanalysis high: 44°CDec 20, 1995
Reanalysis low: 8°CDec 1, 1993
Daylight: 13 h 53 min to 13 h 59 min
Cloud cover: 52%
Humidity: 65%
Dew point: 17°C
Wind: 9.7 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	Reanalysis high	Reanalysis low	Chance wet
Dec 1	32°C	18°C	39°C 1999	8°C 1993	40%
Dec 2	32°C	18°C	38°C 2012	10°C 1993	39%
Dec 3	32°C	18°C	40°C 2012	10°C 2018	38%
Dec 4	32°C	18°C	39°C 1998	12°C 1994	37%
Dec 5	32°C	18°C	37°C 1995	12°C 1994	37%
Dec 6	32°C	18°C	38°C 1995	12°C 2003	38%
Dec 7	32°C	18°C	40°C 1995	11°C 2005	38%
Dec 8	33°C	18°C	42°C 2008	11°C 2018	38%
Dec 9	33°C	18°C	37°C 2000	11°C 2001	39%
Dec 10	33°C	18°C	40°C 1994	13°C 2003	38%
Dec 11	33°C	18°C	40°C 1994	13°C 2005	38%
Dec 12	33°C	18°C	40°C 1994	14°C 2010	38%
Dec 13	33°C	19°C	40°C 2017	11°C 2010	39%
Dec 14	33°C	19°C	38°C 2019	11°C 2010	40%
Dec 15	33°C	19°C	40°C 1995	11°C 2016	40%
Dec 16	33°C	19°C	42°C 2017	13°C 2003	42%
Dec 17	33°C	19°C	42°C 1995	10°C 2003	42%
Dec 18	33°C	19°C	43°C 1995	13°C 2003	40%
Dec 19	33°C	19°C	43°C 1995	14°C 1998	42%
Dec 20	33°C	19°C	44°C 1995	14°C 2005	42%
Dec 21	33°C	19°C	42°C 2011	13°C 1993	41%
Dec 22	34°C	20°C	40°C 2013	13°C 2019	40%
Dec 23	34°C	20°C	40°C 2007	12°C 1998	39%
Dec 24	34°C	20°C	41°C 2013	14°C 2014	39%
Dec 25	34°C	20°C	42°C 1994	11°C 2002	40%
Dec 26	34°C	20°C	41°C 2013	14°C 2002	39%
Dec 27	34°C	20°C	42°C 1994	15°C 1991	38%
Dec 28	34°C	20°C	41°C 2008	15°C 2012	37%
Dec 29	34°C	20°C	42°C 2013	13°C 1993	36%
Dec 30	34°C	20°C	41°C 2013	12°C 1993	36%
Dec 31	34°C	20°C	41°C 2013	13°C 1993	35%

Chance of rain

Chance of a wet day

Sunrise and sunset

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

December 1: sunrise 5:45 AM, sunset 7:38 PM
December 31: sunrise 5:56 AM, sunset 7:55 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.