Formosa Weather in December

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

Average highs run from 33°C on December 1 to 34°C on December 31, and lows from 20°C to 23°C. Normal precipitation for the month is 177 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: 34°C
Average low: 22°C
Precipitation: 177 mm
Reanalysis high: 42°CDec 17, 1995
Reanalysis low: 11°CDec 14, 2010
Daylight: 13 h 40 min to 13 h 45 min
Cloud cover: 59%
Humidity: 67%
Dew point: 20°C
Wind: 13.7 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	33°C	20°C	40°C 1999	12°C 2001	40%
Dec 2	33°C	20°C	39°C 2007	13°C 2011	39%
Dec 3	33°C	21°C	39°C 2007	12°C 2018	38%
Dec 4	33°C	21°C	40°C 1999	14°C 2008	38%
Dec 5	33°C	21°C	40°C 2006	15°C 2000	39%
Dec 6	33°C	21°C	39°C 1995	15°C 1999	39%
Dec 7	33°C	21°C	39°C 2008	14°C 2003	38%
Dec 8	33°C	21°C	40°C 2008	14°C 2018	38%
Dec 9	33°C	21°C	39°C 2017	15°C 2003	38%
Dec 10	33°C	21°C	39°C 2017	16°C 2003	37%
Dec 11	33°C	21°C	39°C 2019	17°C 2005	37%
Dec 12	34°C	21°C	39°C 2019	15°C 2010	36%
Dec 13	34°C	21°C	39°C 1994	13°C 2010	38%
Dec 14	34°C	21°C	41°C 2019	11°C 2010	40%
Dec 15	34°C	22°C	40°C 2017	12°C 2016	41%
Dec 16	34°C	22°C	42°C 2017	13°C 2003	42%
Dec 17	34°C	22°C	42°C 1995	12°C 2003	42%
Dec 18	34°C	22°C	41°C 1995	14°C 2003	41%
Dec 19	34°C	22°C	41°C 2008	16°C 1998	41%
Dec 20	34°C	22°C	42°C 1995	18°C 2005	41%
Dec 21	34°C	22°C	42°C 2011	17°C 1993	42%
Dec 22	34°C	22°C	42°C 2011	15°C 2020	42%
Dec 23	34°C	22°C	42°C 2008	13°C 1998	43%
Dec 24	34°C	22°C	40°C 2013	15°C 1998	45%
Dec 25	34°C	22°C	40°C 2013	15°C 2002	46%
Dec 26	34°C	23°C	39°C 2013	16°C 2004	47%
Dec 27	34°C	23°C	40°C 1997	18°C 1991	46%
Dec 28	34°C	22°C	42°C 2008	17°C 2012	45%
Dec 29	34°C	23°C	40°C 2008	17°C 2003	42%
Dec 30	34°C	23°C	41°C 2019	15°C 1993	41%
Dec 31	34°C	23°C	42°C 2008	16°C 1993	42%

Chance of rain

Chance of a wet day

Sunrise and sunset

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

December 1: sunrise 5:52 AM, sunset 7:32 PM
December 31: sunrise 6:03 AM, sunset 7:48 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.