Chiayi City weather in December

In December, Chiayi City sees average daytime highs of 22°C and overnight lows near 14°C, with 60 mm of rain across 10.7 wet days and about 10.6 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 21°C by the end. The sky is clear or mostly clear about 45% of the time in December, and the air most often feels comfortable.

Daylight stretches from about 10 h 42 min at the start of December to 10 h 36 min by month's end. Set against the rest of the year, December is Chiayi City's 2nd-clearest and 3rd-windiest month. For the whole year in context, see Chiayi City's year-round climate.

Daytime high
22°
10th warmest
Overnight low
14°
3rd coldest
Rainfall
60 mm
10.7 wet days
Daylight
10 h 36 min
6:38 AM – 5:11 PM
Cloud cover
48%
2nd clearest
Wind
7 km/h
3rd windiest
Solar energy
3.6 kWh/m²
Travel score
6.8
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 21°C by the end.

A typical December day in Chiayi City reaches about 22°C in the afternoon and slips back to 14°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 25°C. Set against its neighbours, December runs about 3°C cooler than November and about 2°C warmer than January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12316
22316
32315
42315
52315
62315
72315
82315
92215
102215
112215
122214
132214
142214
152214
162214
172214
182214
192214
202114
212114
222114
232113
242113
252113
262113
272113
282113
292113
302113
312113

How December really feels in Chiayi City

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Chiayi City weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 12°531010.76.6
Feb21° / 13°6211.611.26.3
Mar24° / 16°8513.311.86.4
Apr26° / 19°1441612.55.7
May28° / 21°27022.113.14.3
Jun29° / 23°36524.213.43.3
Jul30° / 24°55526.713.33.0
Aug30° / 24°66728.512.82.9
Sep29° / 23°4362412.13.6
Oct27° / 20°20718.611.45.3
Nov25° / 18°811210.96.7
Dec22° / 14°6010.710.66.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 20% of December, with mostly cloudy or overcast conditions the remaining 35%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16733
26733
36733
46733
56634
66634
76634
86634
96535
106535
116535
126436
136436
146436
156436
166535
176535
186436
196436
206436
216436
226337
236337
246337
256436
266436
276436
286535
296535
306535
316535

Chance of precipitation in December

Any precipitation

Chiayi City gets around 60 mm of rain over 10.7 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 34% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
133
232
332
432
532
631
731
831
932
1032
1132
1233
1333
1433
1533
1633
1734
1834
1934
2035
2136
2236
2336
2437
2537
2636
2736
2836
2936
3036
3135

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the comfortable band about 38% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
117264511
218284410
31929429
42031418
52132397
62233387
72335366
82436355
92537335
102538324
112639314
122740304
132840283
142940273
153040263
163141253
173241243
183441233
193541222
203641212
213741202
223841202
233940192
244040182
254140181
264240171
274240171
284340171
294340161
304340161
314440160

Wind in December

Winds average 7 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 42 min at the start of December to 10 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 6:28 AM to 6:44 AM, and sunset from 5:08 PM to 5:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.76:285:08
210.66:295:08
310.66:305:08
410.66:305:08
510.66:315:08
610.66:325:08
710.66:325:09
810.66:335:09
910.66:335:09
1010.66:345:09
1110.66:355:10
1210.66:355:10
1310.66:365:10
1410.66:365:10
1510.66:375:11
1610.66:385:11
1710.66:385:12
1810.66:395:12
1910.66:395:12
2010.66:405:13
2110.66:405:13
2210.66:415:14
2310.66:415:14
2410.66:425:15
2510.66:425:15
2610.66:425:16
2710.66:435:16
2810.66:435:17
2910.66:445:17
3010.66:445:18
3110.66:445:19

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.6 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.6 kWh/m² to a high of 5.62 kWh/m² in April across the year — December's 3.6 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.8Moderate
23.7Moderate
33.7Moderate
43.7Moderate
53.7Moderate
63.7Moderate
73.7Moderate
83.7Moderate
93.6Moderate
103.6Moderate
113.6Moderate
123.6Moderate
133.6Moderate
143.6Moderate
153.6Moderate
163.6Moderate
173.6Moderate
183.6Moderate
193.6Moderate
203.6Moderate
213.6Moderate
223.6Moderate
233.6Moderate
243.6Moderate
253.6Moderate
263.6Moderate
273.7Moderate
283.7Moderate
293.7Moderate
303.7Moderate
313.7Moderate
Planning a trip in December

Hazard calendar for Chiayi City

In seasonPeak

In December, Chiayi City sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Chiayi City sits in the Pacific typhoon belt; the season peaks July–October.

Chiayi City's monsoon runs June–September, when most of the year's rain falls.

Pacific typhoon
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Chiayi City?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.8
Sightseeing
1st-best month of the year
4.7
Beach & pool
6th-best month of the year

December is a reasonable time to visit Chiayi City for sightseeing.

What to pack for Chiayi City in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Chiayi City sees daytime highs around 22°C and nights near 14°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Chiayi City in December

The nearest coast averages about 23°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 35 km away) is warmest in July at about 29°C and coldest in January near 22°C.

The water stays above 20°C all year — warm enough for a swim any month.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb22Refreshing
Mar23Refreshing
Apr25Warm
May27Warm
Jun28Tropical
Jul29Tropical
Aug29Tropical
Sep28Tropical
Oct27Warm
Nov25Warm
Dec23Refreshing

UV index in Chiayi City in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chiayi City peaks around June 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 6 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJun 17UV 12Dec 20UV 6
UV index (midday)Level
Jan6High
Feb8Very high
Mar10Very high
Apr8Very high
May10Very high
Jun12Extreme
Jul10Extreme
Aug11Extreme
Sep9Very high
Oct7Very high
Nov7High
Dec6High

Air quality in Chiayi City in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Chiayi City is worst in March — around 40 µg/m³ PM2.5 (poor), about 1.7× the cleanest month (July, 23 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateMar 1739 µg/m³Jul 1323 µg/m³
PM2.5 (µg/m³)Level
Jan36Poor
Feb36Poor
Mar40Poor
Apr36Poor
May28Moderate
Jun24Moderate
Jul23Moderate
Aug25Moderate
Sep31Moderate
Oct33Moderate
Nov34Moderate
Dec33Moderate
Location & terrain

Where is Chiayi City?

Chiayi City sits at 23.5°N, 120.4°E, 45 m above sea level, in Taiwan. The nearest listed city is Taibao, 12 km away.

XinyingDouliuCitongBudaiErlun

Topography around Chiayi City

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Chiayi City.

Within 3 km, the terrain around Chiayi City has only modest variations in elevation — a maximum elevation change of 84 m around an average of 40 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 860 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,887 m.

The land around Chiayi City is covered by artificial surfaces (65%) and trees (23%) within 3 km, trees (46%) and cropland (37%) within 16 km, and trees (47%) and water (32%) within 80 km.

3 km
84 m
16 km
860 m
80 km
3,887 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Taibao 12 km · Xingang 14 km · Beigang 18 km · Xinying 24 km · Douliu 27 km · Citong 31 km · Budai 31 km · Erlun 33 km

Taiwan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
110 / 220 V · 60 Hz
Happiness
6.7 / 10
World Happiness, 2025
Religion
Buddhist 35%Taoist 33%none or unspecified 18%folk religion approximately 10%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Chiayi City (23.4792°, 120.4489°, elevation 45 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).