Mertoyudan Weather in December

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

Average highs run from 27°C on December 1 to 26°C on December 31, and lows from 21°C to 21°C. Normal precipitation for the month is 298 mm over about 28 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: 27°C
Average low: 21°C
Precipitation: 298 mm
Reanalysis high: 32°CDec 3, 2019
Reanalysis low: 17°CDec 23, 2001
Daylight: 12 h 32 min to 12 h 34 min
Cloud cover: 88%
Humidity: 89%
Dew point: 21°C
Wind: 9.0 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	27°C	21°C	31°C 2019	20°C 2010	86%
Dec 2	27°C	21°C	30°C 2006	19°C 2000	86%
Dec 3	27°C	21°C	32°C 2019	18°C 2000	86%
Dec 4	27°C	21°C	32°C 2019	18°C 2000	87%
Dec 5	27°C	21°C	31°C 2019	18°C 2000	88%
Dec 6	27°C	21°C	30°C 1997	18°C 2000	89%
Dec 7	27°C	21°C	30°C 2019	19°C 2000	89%
Dec 8	27°C	21°C	30°C 2002	19°C 2001	88%
Dec 9	27°C	21°C	29°C 2002	18°C 2001	88%
Dec 10	27°C	21°C	29°C 2019	19°C 2001	88%
Dec 11	27°C	21°C	30°C 2006	19°C 2001	88%
Dec 12	27°C	21°C	30°C 2006	19°C 2001	88%
Dec 13	27°C	21°C	29°C 2006	20°C 2001	87%
Dec 14	27°C	21°C	31°C 2006	20°C 2017	87%
Dec 15	27°C	21°C	30°C 2006	20°C 2016	87%
Dec 16	27°C	21°C	30°C 1997	20°C 2016	86%
Dec 17	27°C	21°C	30°C 2002	19°C 1991	86%
Dec 18	27°C	21°C	30°C 1997	19°C 2009	86%
Dec 19	27°C	21°C	30°C 1997	19°C 2009	86%
Dec 20	27°C	21°C	30°C 2002	19°C 1992	85%
Dec 21	27°C	21°C	30°C 2019	19°C 1992	84%
Dec 22	27°C	21°C	29°C 1991	18°C 2001	84%
Dec 23	27°C	21°C	29°C 1991	17°C 2001	85%
Dec 24	27°C	21°C	30°C 2019	19°C 2017	84%
Dec 25	27°C	21°C	29°C 1994	19°C 1996	85%
Dec 26	27°C	21°C	30°C 1994	19°C 2013	86%
Dec 27	27°C	21°C	30°C 1994	18°C 2013	85%
Dec 28	27°C	21°C	30°C 1994	19°C 1996	86%
Dec 29	27°C	21°C	29°C 2015	19°C 1996	86%
Dec 30	27°C	21°C	30°C 2015	19°C 1993	87%
Dec 31	26°C	21°C	30°C 2015	19°C 1993	87%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT+7).

December 1: sunrise 5:12 AM, sunset 5:44 PM
December 31: sunrise 5:25 AM, sunset 5:59 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.