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 20°C on December 1 to 21°C on December 31, and lows from 13°C to 13°C. Normal precipitation for the month is 121 mm over about 19 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: 20°C
Average low: 13°C
Precipitation: 121 mm
Reanalysis high: 24°CDec 30, 2015
Reanalysis low: 10°CDec 16, 2018
Daylight: 12 h 02 min to 12 h 02 min
Cloud cover: 81%
Humidity: 87%
Dew point: 14°C
Wind: 6.5 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	20°C	13°C	22°C 1991	12°C 2000	78%
Dec 2	20°C	13°C	23°C 2006	12°C 2001	77%
Dec 3	20°C	13°C	23°C 2009	11°C 2000	76%
Dec 4	20°C	13°C	22°C 2000	12°C 1993	74%
Dec 5	20°C	13°C	23°C 2009	11°C 1993	73%
Dec 6	20°C	13°C	23°C 2009	11°C 2010	73%
Dec 7	20°C	13°C	23°C 2020	11°C 2010	72%
Dec 8	20°C	13°C	23°C 2000	11°C 1994	71%
Dec 9	20°C	13°C	23°C 2017	11°C 1994	70%
Dec 10	20°C	13°C	23°C 2015	12°C 2012	69%
Dec 11	20°C	13°C	23°C 2015	12°C 1995	68%
Dec 12	20°C	13°C	24°C 2015	12°C 1995	68%
Dec 13	20°C	13°C	23°C 2000	11°C 1994	66%
Dec 14	20°C	13°C	23°C 2001	11°C 2009	65%
Dec 15	20°C	13°C	24°C 2009	11°C 1998	64%
Dec 16	20°C	13°C	23°C 2009	10°C 2018	63%
Dec 17	20°C	13°C	23°C 2017	11°C 2003	62%
Dec 18	20°C	13°C	22°C 2001	12°C 1995	62%
Dec 19	20°C	13°C	23°C 2017	11°C 2003	62%
Dec 20	20°C	13°C	22°C 2017	11°C 1995	62%
Dec 21	20°C	13°C	23°C 2001	11°C 2003	62%
Dec 22	20°C	13°C	23°C 2015	11°C 2006	59%
Dec 23	20°C	13°C	23°C 2015	10°C 2014	57%
Dec 24	20°C	13°C	23°C 2015	11°C 2006	56%
Dec 25	21°C	13°C	22°C 1997	11°C 2018	55%
Dec 26	21°C	13°C	22°C 1997	12°C 2018	54%
Dec 27	21°C	13°C	23°C 2015	12°C 1991	53%
Dec 28	21°C	13°C	23°C 2001	12°C 2005	54%
Dec 29	21°C	13°C	23°C 2015	11°C 2012	54%
Dec 30	21°C	13°C	24°C 2015	11°C 2005	54%
Dec 31	21°C	13°C	23°C 2001	11°C 2002	55%

Chance of rain

Chance of a wet day

Sunrise and sunset

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

December 1: sunrise 5:57 AM, sunset 5:59 PM
December 31: sunrise 6:11 AM, sunset 6:13 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.