La Unión Weather in December

NASA POWER reanalysis for the half-degree grid cell around La Unión, 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 19°C to 22°C. Normal precipitation for the month is 9 mm over about 0 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: 21°C
Precipitation: 9 mm
Reanalysis high: 38°CDec 23, 1997
Reanalysis low: 15°CDec 1, 2005
Daylight: 12 h 25 min to 12 h 26 min
Cloud cover: 53%
Humidity: 63%
Dew point: 17°C
Wind: 19.4 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	19°C	36°C 1997	15°C 2005	3%
Dec 2	32°C	20°C	36°C 1997	16°C 2005	3%
Dec 3	32°C	20°C	36°C 1997	16°C 1998	3%
Dec 4	33°C	20°C	36°C 1997	16°C 1998	2%
Dec 5	33°C	20°C	37°C 1997	17°C 1998	2%
Dec 6	33°C	20°C	37°C 1997	16°C 1992	2%
Dec 7	33°C	20°C	36°C 1997	17°C 1998	3%
Dec 8	33°C	20°C	35°C 2015	18°C 1998	3%
Dec 9	33°C	20°C	36°C 2015	18°C 1995	3%
Dec 10	33°C	20°C	36°C 2015	17°C 2007	3%
Dec 11	33°C	20°C	36°C 1997	17°C 1995	3%
Dec 12	33°C	20°C	35°C 2015	17°C 1995	4%
Dec 13	33°C	20°C	35°C 1997	16°C 1995	4%
Dec 14	33°C	20°C	35°C 2015	17°C 1995	4%
Dec 15	33°C	20°C	36°C 2015	18°C 1995	4%
Dec 16	33°C	21°C	35°C 2015	19°C 1995	3%
Dec 17	33°C	21°C	35°C 2015	19°C 2010	4%
Dec 18	33°C	21°C	35°C 2002	18°C 2007	4%
Dec 19	33°C	21°C	35°C 2015	18°C 2007	4%
Dec 20	33°C	21°C	35°C 2015	18°C 2008	4%
Dec 21	33°C	21°C	37°C 1997	18°C 2007	5%
Dec 22	33°C	21°C	36°C 1997	18°C 2008	5%
Dec 23	33°C	21°C	38°C 1997	19°C 2007	5%
Dec 24	33°C	21°C	37°C 1997	19°C 2004	4%
Dec 25	33°C	21°C	37°C 1997	19°C 2004	4%
Dec 26	33°C	21°C	37°C 1997	20°C 2007	4%
Dec 27	33°C	21°C	36°C 2015	20°C 2011	4%
Dec 28	34°C	21°C	37°C 2015	20°C 2004	3%
Dec 29	34°C	21°C	36°C 2015	20°C 2008	3%
Dec 30	34°C	22°C	37°C 2015	20°C 2004	4%
Dec 31	34°C	22°C	36°C 2015	20°C 2020	4%

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 6:25 PM
December 31: sunrise 6:13 AM, sunset 6:39 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.