Yamaga weather in December

In December, Yamaga sees average daytime highs of 12°C and overnight lows near 3°C, with 69 mm of precipitation across 7.9 wet days and about 9.9 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 14°C in the first days to 10°C by the end. The sky is clear or mostly clear about 29% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 hours at the start of December to 9 h 48 min by month's end. Set against the rest of the year, December is Yamaga's 3rd-clearest and 5th-windiest month. For the whole year in context, see Yamaga's year-round climate.

Daytime high
12°
10th warmest
Overnight low
3rd coldest
Precipitation
69 mm
7.9 wet days
Daylight
9 h 48 min
7:18 AM – 5:08 PM
Cloud cover
56%
3rd clearest
Wind
8 km/h
5th windiest
Solar energy
2.27 kWh/m²
Travel score
3.2
out of 10

Yamaga is city in Kumamoto Prefecture, Japan.

Density
164/km²
people per km²
Founded
2005

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 14°C in the first days to 10°C by the end.

A typical December day in Yamaga reaches about 12°C in the afternoon and slips back to 3°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 16°C. Set against its neighbours, December runs about 6°C cooler than November and about 2°C warmer than January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1145
2145
3145
4135
5135
6135
7134
8134
9124
10124
11124
12124
13124
14123
15113
16113
17113
18113
19113
20113
21113
22113
23113
24113
25113
26113
27102
28102
29102
30102
31102

How December really feels in Yamaga

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 3 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
3
wind chill below the day's low

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Yamaga 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 daysSnow daysDaylight (hours)Travel score
Jan / 648.21.110.12.0
Feb11° / 889.3110.82.6
Mar15° / 13612.30.211.74.1
Apr19° / 10°15511.4012.85.8
May24° / 15°18111.5013.76.5
Jun26° / 19°42017014.15.3
Jul29° / 23°34317.80144.3
Aug31° / 24°15814.2013.24.2
Sep28° / 20°15611.3012.25.9
Oct23° / 14°967.5011.27.3
Nov17° / 847.9010.35.8
Dec12° / 697.90.49.93.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 22% of December, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25644
35644
45545
55545
65446
75347
85347
95248
105248
115248
125149
135149
145149
155050
165050
175050
185050
195050
205050
214951
224852
234951
244951
254852
264852
274852
284951
294951
304951
314753

Chance of precipitation in December

Any precipitationSnow

Yamaga gets around 69 mm of rain and snow over 7.9 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 25% and peaks near 28% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1270
2270
3280
4280
5280
6270
7271
8271
9271
10261
11261
12261
13261
14251
15251
16251
17251
18251
19241
20241
21241
22241
23242
24242
25242
26242
27242
28233
29233
30233
31233

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 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19631
29631
39631
49721
59721
69820
79820
89820
99910
109910
119910
129910
139910
149910
159910
169910
179910
189910
1910000
2010000
2110000
2210000
2310000
2410000
2510000
2610000
2710000
2810000
2910000
3010000
3110000

Wind in December

Winds average 8 km/h in December.

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

0246810151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 hours at the start of December to 9 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:08 AM to 7:25 AM, and sunset from 5:06 PM to 5:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.07:085:06
210.07:085:06
39.97:095:06
49.97:105:06
59.97:115:06
69.97:125:06
79.97:125:06
89.97:135:07
99.97:145:07
109.97:155:07
119.97:155:07
129.97:165:07
139.87:175:07
149.87:175:08
159.87:185:08
169.87:185:08
179.87:195:09
189.87:205:09
199.87:205:09
209.87:215:10
219.87:215:10
229.87:225:11
239.87:225:11
249.87:235:12
259.87:235:12
269.87:235:13
279.87:245:13
289.87:245:14
299.87:245:15
309.87:255:15
319.87:255:16

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.27 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.27 kWh/m² to a high of 5.18 kWh/m² in May across the year — December's 2.27 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.4Moderate
22.4Moderate
32.4Moderate
42.3Moderate
52.3Moderate
62.3Moderate
72.3Moderate
82.3Moderate
92.3Moderate
102.3Moderate
112.3Moderate
122.3Moderate
132.3Moderate
142.3Moderate
152.3Moderate
162.3Moderate
172.3Moderate
182.3Moderate
192.3Moderate
202.3Moderate
212.3Moderate
222.3Moderate
232.3Moderate
242.3Moderate
252.3Moderate
262.3Moderate
272.3Moderate
282.3Moderate
292.4Moderate
302.4Moderate
312.4Moderate
Planning a trip in December

Hazard calendar for Yamaga

In seasonPeak

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

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

Yamaga'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 Yamaga?

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

3.2
Sightseeing
10th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Yamaga.

What to pack for Yamaga in December

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

In December, Yamaga sees daytime highs around 12°C and nights near 3°C. Pack a warm layer. About 8 days see rain.

a warm layer

Sea temperature near Yamaga in December

The nearest coast averages about 17°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 17 km away) is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from May 27 to Nov 13 — about 5.6 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar14Bracing
Apr16Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Cool
Dec17Cool

UV index in Yamaga in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yamaga peaks around July 13 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 13UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Yamaga 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 Yamaga is worst in March — around 25 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (July, 13 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2325 µg/m³Jul 2114 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb20Moderate
Mar25Moderate
Apr25Moderate
May23Moderate
Jun19Moderate
Jul13Moderate
Aug15Moderate
Sep14Moderate
Oct14Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Yamaga?

Yamaga sits at 33.0°N, 130.7°E, 35 m above sea level, in Japan. The nearest listed city is Kikuchi, 12 km away.

Topography around Yamaga

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

Within 3 km, the terrain around Yamaga has only modest variations in elevation — a maximum elevation change of 153 m around an average of 42 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,029 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,765 m.

The land around Yamaga is covered by cropland (37%), trees (30%) and artificial surfaces (24%) within 3 km, trees (68%) within 16 km, and trees (65%) within 80 km.

3 km
153 m
16 km
1,029 m
80 km
1,765 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Kikuchi 12 km · Uekimachi-mōno 13 km · Tamana 13 km · Kōshi 16 km · Okino 19 km · Miyama 21 km · Ōmuta 22 km · Ōzu 23 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 Yamaga (33.0167°, 130.6891°, elevation 35 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).