Yilan Weather in December

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

Average highs run from 21°C on December 1 to 19°C on December 31, and lows from 19°C to 16°C. Normal precipitation for the month is 102 mm over about 16 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: 17°C
Precipitation: 102 mm
Reanalysis high: 27°CDec 6, 2002
Reanalysis low: 8°CDec 22, 1999
Daylight: 10 h 43 min to 10 h 38 min
Cloud cover: 87%
Humidity: 81%
Dew point: 15°C
Wind: 24.5 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	21°C	19°C	25°C 2019	14°C 1996	56%
Dec 2	21°C	19°C	24°C 2018	15°C 1996	55%
Dec 3	21°C	19°C	26°C 1993	15°C 2009	54%
Dec 4	21°C	18°C	27°C 2018	14°C 2014	54%
Dec 5	21°C	18°C	26°C 2002	12°C 2005	53%
Dec 6	21°C	18°C	27°C 2002	12°C 2005	52%
Dec 7	21°C	18°C	26°C 2006	12°C 1996	52%
Dec 8	21°C	18°C	24°C 1994	13°C 1995	51%
Dec 9	21°C	18°C	25°C 1994	13°C 2002	50%
Dec 10	20°C	18°C	25°C 1994	13°C 2002	50%
Dec 11	20°C	18°C	26°C 1994	14°C 1997	50%
Dec 12	20°C	18°C	25°C 1994	14°C 2014	52%
Dec 13	20°C	18°C	24°C 2010	14°C 2001	53%
Dec 14	20°C	18°C	23°C 1995	14°C 2001	54%
Dec 15	20°C	17°C	25°C 2012	13°C 2005	53%
Dec 16	20°C	17°C	24°C 2012	11°C 2010	51%
Dec 17	20°C	17°C	25°C 2019	11°C 2010	51%
Dec 18	20°C	17°C	25°C 2002	12°C 2005	50%
Dec 19	20°C	17°C	25°C 1997	12°C 2003	50%
Dec 20	20°C	17°C	25°C 2000	11°C 1999	50%
Dec 21	19°C	17°C	24°C 2012	10°C 1999	51%
Dec 22	19°C	17°C	24°C 2018	8°C 1999	51%
Dec 23	19°C	17°C	23°C 1994	10°C 1999	51%
Dec 24	19°C	17°C	23°C 1994	12°C 2012	52%
Dec 25	19°C	16°C	23°C 2016	11°C 2001	50%
Dec 26	19°C	16°C	24°C 2016	10°C 2010	48%
Dec 27	19°C	16°C	24°C 1992	10°C 2010	46%
Dec 28	19°C	16°C	22°C 2008	8°C 1991	45%
Dec 29	19°C	16°C	23°C 1997	8°C 1991	45%
Dec 30	19°C	16°C	23°C 2003	9°C 2020	46%
Dec 31	19°C	16°C	22°C 2016	8°C 2020	48%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT+8).

December 1: sunrise 6:20 AM, sunset 5:03 PM
December 31: sunrise 6:37 AM, sunset 5:15 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.