Chatan weather in December

In December, Chatan sees average daytime highs of 21°C and overnight lows near 19°C, with 113 mm of rain across 11.2 wet days and about 10.4 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 20°C by the end. The sky is clear or mostly clear about 21% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 30 min at the start of December to 10 h 24 min by month's end. Set against the rest of the year, December is Chatan's 8th-clearest and 1st-windiest month. For the whole year in context, see Chatan's year-round climate.

Daytime high
21°
9th warmest
Overnight low
19°
4th coldest
Rainfall
113 mm
11.2 wet days
Daylight
10 h 24 min
7:14 AM – 5:36 PM
Cloud cover
67%
8th clearest
Wind
28 km/h
1st windiest
Solar energy
2.39 kWh/m²
Travel score
6.1
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 22°C in the first days to 20°C by the end.

A typical December day in Chatan reaches about 21°C in the afternoon and slips back to 19°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 23°C. Set against its neighbours, December runs about 3°C cooler than November and about 2°C warmer than January.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12221
22220
32220
42220
52220
62220
72220
82120
92120
102120
112119
122119
132119
142119
152119
162119
172119
182119
192119
202019
212019
222018
232018
242018
252018
262018
272018
282018
292018
302018
312018

How December really feels in Chatan

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.

Chatan weather by month

How December compares with the rest of the year at a glance. December is the 9th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan19° / 17°10311.710.55.7
Feb19° / 17°9611.411.15.6
Mar20° / 18°12812.711.85.9
Apr22° / 20°15012.712.66.1
May24° / 23°20713.813.36.1
Jun27° / 26°21815.813.65.4
Jul29° / 27°12611.413.55.5
Aug29° / 27°17814.812.95.1
Sep28° / 27°19914.212.25.7
Oct26° / 25°14111.611.46.5
Nov24° / 22°10110.610.76.7
Dec21° / 19°11311.210.46.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 61%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24159
34060
44159
54060
64060
74060
84060
93961
103961
113961
123961
134060
144060
154060
164060
174159
184159
194060
203961
213961
223961
233961
243961
253862
263862
273862
283664
293664
303565
313367

Chance of precipitation in December

Any precipitation

Chatan gets around 113 mm of rain over 11.2 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 36% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
336
436
536
635
735
836
936
1036
1136
1236
1336
1436
1536
1637
1737
1837
1937
2037
2137
2237
2336
2436
2536
2636
2736
2836
2936
3036
3136

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 43% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1252528193
2272527183
3282526173
4302625163
5312725153
6322724143
7342823132
8352922122
9363021122
10373021112
11373120101
12383120101
13393119101
14403119101
1540311990
1641311890
1742311890
1843301890
1944301780
2046291780
2148281780
2249271670
2351261670
2452251670
2554251560
2655241560
2756241550
2857241450
2957241450
3058241440
3158241440

Wind in December

Winds average 28 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 27 km/h on the calmest days to 29 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
129breezy
229breezy
329breezy
429breezy
529breezy
629breezy
729breezy
829breezy
929breezy
1028breezy
1128breezy
1228breezy
1328breezy
1428breezy
1528breezy
1628breezy
1728breezy
1828breezy
1928breezy
2028breezy
2128breezy
2228breezy
2328breezy
2428breezy
2527breezy
2627breezy
2727breezy
2827breezy
2927breezy
3027breezy
3127breezy

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 30 min at the start of December to 10 h 24 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 7:05 AM to 7:21 AM, and sunset from 5:33 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.57:055:33
210.57:055:33
310.47:065:33
410.47:075:33
510.47:075:33
610.47:085:33
710.47:095:33
810.47:095:34
910.47:105:34
1010.47:115:34
1110.47:115:34
1210.47:125:35
1310.47:135:35
1410.47:135:35
1510.47:145:36
1610.47:145:36
1710.47:155:36
1810.47:155:37
1910.47:165:37
2010.47:165:37
2110.37:175:38
2210.37:175:38
2310.37:185:39
2410.47:185:39
2510.47:195:40
2610.47:195:40
2710.47:205:41
2810.47:205:41
2910.47:205:42
3010.47:215:43
3110.47:215:43

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.39 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.39 kWh/m² to a high of 6.42 kWh/m² in July across the year — December's 2.39 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.6Moderate
22.6Moderate
32.6Moderate
42.5Moderate
52.5Moderate
62.5Moderate
72.5Moderate
82.5Moderate
92.4Moderate
102.4Moderate
112.4Moderate
122.4Moderate
132.4Moderate
142.4Moderate
152.4Moderate
162.4Moderate
172.4Moderate
182.4Moderate
192.4Moderate
202.4Moderate
212.4Moderate
222.4Moderate
232.4Moderate
242.4Moderate
252.4Moderate
262.4Moderate
272.4Moderate
282.4Moderate
292.4Moderate
302.4Moderate
312.4Moderate
Planning a trip in December

Hazard calendar for Chatan

In seasonPeak

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

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

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

Is December a good time to visit Chatan?

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

6.1
Sightseeing
3rd-best month of the year
3.7
Beach & pool
9th-best month of the year

December is a reasonable time to visit Chatan for sightseeing.

What to pack for Chatan in December

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

In December, Chatan sees daytime highs around 21°C and nights near 19°C. Pack a windbreaker. Worth having: rain gear. About 11 days see rain.

a windbreakerrain gear

Sea temperature near Chatan in December

The nearest coast averages about 24°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 13 km away) is warmest in August at about 29°C and coldest in February 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
Mar22Refreshing
Apr23Refreshing
May25Warm
Jun27Warm
Jul29Tropical
Aug29Tropical
Sep28Tropical
Oct27Warm
Nov25Warm
Dec24Refreshing

UV index in Chatan in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chatan peaks around July 11 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJul 11UV 11Dec 23UV 5
UV index (midday)Level
Jan5High
Feb7Very high
Mar9Very high
Apr8Very high
May10Very high
Jun11Extreme
Jul12Extreme
Aug11Extreme
Sep11Extreme
Oct8Very high
Nov7High
Dec5Moderate

Air quality in Chatan 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 Chatan is worst in March — around 17 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (July, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodMar 2017 µg/m³Jul 128 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb14Moderate
Mar17Moderate
Apr16Moderate
May13Moderate
Jun9Good
Jul8Good
Aug10Good
Sep9Good
Oct9Good
Nov10Good
Dec10Good
Location & terrain

Where is Chatan?

Chatan sits at 26.3°N, 127.8°E, 27 m above sea level, in Japan. The nearest listed city is Kishaba, 2.0 km away.

Topography around Chatan

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

Within 3 km, the terrain around Chatan has only modest variations in elevation — a maximum elevation change of 144 m around an average of 48 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 202 m; within 80 km, significant variations in elevation — a maximum elevation change of 491 m.

The land around Chatan is covered by artificial surfaces (50%) and trees (23%) within 3 km, water (58%) and artificial surfaces (21%) within 16 km, and water (91%) within 80 km.

3 km
144 m
16 km
202 m
80 km
491 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Kishaba 2.0 km · Okinawa 4.0 km · Ginowan 5.0 km · Nakagusuku 7.0 km · Nishihara 7.0 km · Urasoe 7.0 km · Yomitan 11 km · Katsuren-haebaru 11 km

Japan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
100 V · 50 / 60 Hz
Prices
≈ 65% of US
price level, 2025
GDP per capita
$35,951
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.2
per 100k, 2023
Road deaths
3.6
per 100k/yr, 2019
Income group
High
World Bank
English
Very low
EF EPI 446
Religion
Shintoism 49%Buddhism 46%other 4%Christianity 1%

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 Chatan (26.3095°, 127.7702°, elevation 27 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).