Kokubu-matsuki weather in December

In December, Kokubu-matsuki sees average daytime highs of 13°C and overnight lows near 4°C, with 81 mm of precipitation across 7.1 wet days and about 10 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 15°C in the first days to 12°C by the end. The sky is clear or mostly clear about 38% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 06 min at the start of December to 10 hours by month's end. Set against the rest of the year, December is Kokubu-matsuki's 3rd-clearest and 4th-windiest month. For the whole year in context, see Kokubu-matsuki's year-round climate.

Daytime high
13°
10th warmest
Overnight low
3rd coldest
Precipitation
81 mm
7.1 wet days
Daylight
9 h 54 min
7:15 AM – 5:11 PM
Cloud cover
52%
3rd clearest
Wind
9 km/h
4th windiest
Solar energy
2.57 kWh/m²
Travel score
4.0
out of 10

Kokubu-matsuki is human settlement in Japan.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 15°C in the first days to 12°C by the end.

A typical December day in Kokubu-matsuki reaches about 13°C in the afternoon and slips back to 4°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 17°C. Set against its neighbours, December runs about 5°C cooler than November and about 2°C warmer than January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1157
2156
3156
4156
5156
6146
7145
8145
9145
10145
11145
12135
13135
14134
15134
16134
17134
18134
19134
20134
21124
22124
23124
24123
25123
26123
27123
28123
29123
30123
31123

How December really feels in Kokubu-matsuki

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.

Kokubu-matsuki 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
Jan11° / 808.310.22.8
Feb12° / 102910.83.3
Mar16° / 15712.911.84.6
Apr20° / 11°18111.812.85.9
May24° / 15°20511.713.66.4
Jun26° / 20°48819.9144.8
Jul30° / 24°29919.413.93.9
Aug31° / 24°17418.313.23.8
Sep28° / 21°2021512.25.2
Oct24° / 15°114911.27.1
Nov18° / 1078.210.46.2
Dec13° / 817.1104.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% 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 42%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25842
35842
45941
55941
65842
75842
85842
95842
105842
115842
125842
135842
145842
155743
165743
175743
185842
195842
205842
215941
225941
235842
245941
255941
266040
275941
286040
295941
305941
315842

Chance of precipitation in December

Any precipitation

Kokubu-matsuki gets around 81 mm of rain and snow over 7.1 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 23% and peaks near 28% on the wettest days, and about 0 day brings snow. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
128
228
327
427
527
626
726
825
925
1024
1124
1224
1324
1423
1523
1623
1723
1822
1922
2022
2121
2221
2321
2421
2520
2620
2720
2820
2921
3021
3121

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 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19172
29172
39172
49262
59361
69451
79451
89451
99541
109541
119640
129640
139730
149730
159730
169730
179730
189730
199730
209820
219820
229820
239820
249820
259820
269910
279910
289910
299910
309910
319910

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 06 min at the start of December to 10 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:04 AM to 7:21 AM, and sunset from 5:09 PM to 5:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.17:045:09
210.17:055:09
310.17:065:09
410.07:075:09
510.07:075:09
610.07:085:09
710.07:095:09
810.07:105:09
910.07:105:10
1010.07:115:10
1110.07:125:10
1210.07:125:10
1310.07:135:10
149.97:145:11
159.97:145:11
169.97:155:11
179.97:165:12
189.97:165:12
199.97:175:12
209.97:175:13
219.97:185:13
229.97:185:14
239.97:195:14
249.97:195:15
259.97:195:15
269.97:205:16
279.97:205:16
289.97:215:17
299.97:215:17
309.97:215:18
3110.07:215:19

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.57 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.57 kWh/m² to a high of 5 kWh/m² in May across the year — December's 2.57 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.6Moderate
22.6Moderate
32.6Moderate
42.6Moderate
52.6Moderate
62.6Moderate
72.6Moderate
82.6Moderate
92.6Moderate
102.5Moderate
112.5Moderate
122.5Moderate
132.5Moderate
142.5Moderate
152.6Moderate
162.6Moderate
172.6Moderate
182.6Moderate
192.6Moderate
202.6Moderate
212.6Moderate
222.6Moderate
232.6Moderate
242.6Moderate
252.6Moderate
262.7Moderate
272.7Moderate
282.7Moderate
292.7Moderate
302.7Moderate
312.7Moderate
Planning a trip in December

Hazard calendar for Kokubu-matsuki

In seasonPeak

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

Kokubu-matsuki sits in the Pacific typhoon belt; the season peaks July–October.

Kokubu-matsuki's rainy season runs June–July, when most of the year's rain falls.

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

Is December a good time to visit Kokubu-matsuki?

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

4.0
Sightseeing
8th-best month of the year
0.1
Beach & pool
10th-best month of the year

December is a reasonable time to visit Kokubu-matsuki for sightseeing.

What to pack for Kokubu-matsuki in December

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

In December, Kokubu-matsuki sees daytime highs around 13°C and nights near 4°C. Worth packing: a warm layer. About 7 days see rain.

a warm layer

Sea temperature near Kokubu-matsuki in December

The nearest coast averages about 21°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 42 km away) is warmest in August at about 28°C and coldest in February near 18°C.

It's comfortable for a long swim from Apr 24 to Dec 26 — about 8.1 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan19Cool
Feb18Cool
Mar18Cool
Apr20Cool
May21Refreshing
Jun24Refreshing
Jul27Warm
Aug28Tropical
Sep27Warm
Oct25Warm
Nov23Refreshing
Dec21Refreshing

UV index in Kokubu-matsuki in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Kokubu-matsuki peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 11Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar7High
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug9Very high
Sep10Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in Kokubu-matsuki 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 Kokubu-matsuki is worst in April — around 23 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1423 µg/m³Oct 1012 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb19Moderate
Mar22Moderate
Apr23Moderate
May21Moderate
Jun17Moderate
Jul12Moderate
Aug14Moderate
Sep12Moderate
Oct12Moderate
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Kokubu-matsuki?

Kokubu-matsuki sits at 31.7°N, 130.8°E, 0 m above sea level, in Japan. The nearest listed city is Kirishima, 1.0 km away.

Topography around Kokubu-matsuki

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

Within 3 km, the terrain around Kokubu-matsuki has only modest variations in elevation — a maximum elevation change of 220 m around an average of 26 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 603 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,680 m.

The land around Kokubu-matsuki is covered by artificial surfaces (48%), trees (24%) and cropland (21%) within 3 km, trees (60%) and water (26%) within 16 km, and trees (55%) and water (36%) within 80 km.

3 km
220 m
16 km
603 m
80 km
1,680 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Kirishima 1.0 km · Hamanoichi 4.0 km · Kajiki 9.0 km · Aira 17 km · Soo 23 km · Sueyoshichō-ninokata 25 km · Kagoshima 28 km · Miyakonojō 28 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 Kokubu-matsuki (31.7333°, 130.7667°, elevation 0 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).