Karasuyama weather in December

In December, Karasuyama sees average daytime highs of 9°C and overnight lows near 1°C, with 50 mm of precipitation across 7 wet days and about 9.5 hours of daylight. It is the 10th-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 11°C in the first days to 8°C by the end. The sky is clear or mostly clear about 54% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 42 min at the start of December to 9 h 30 min by month's end. Set against the rest of the year, December is Karasuyama's 1st-clearest and 6th-windiest month. For the whole year in context, see Karasuyama's year-round climate.

Daytime high
10th warmest
Overnight low
3rd coldest
Precipitation
50 mm
7 wet days
Daylight
9 h 30 min
6:50 AM – 4:21 PM
Cloud cover
43%
1st clearest
Wind
7 km/h
6th windiest
Solar energy
2.35 kWh/m²
Travel score
2.1
out of 10

Karasuyama is dissolved municipality in Nasu district, Tochigi prefecture, Japan.

Founded
1889

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 11°C in the first days to 8°C by the end.

A typical December day in Karasuyama reaches about 9°C in the afternoon and slips back to 1°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 13°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)
1113
2113
3113
4112
5112
6112
7102
8102
9102
10102
11101
12101
1391
1491
1591
1691
1791
1891
1991
2091
2180
2280
2380
2480
2580
2680
2780
2880
2980
3080
3180

How December really feels in Karasuyama

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 26 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
26
wind chill below the day's low

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

Karasuyama weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°5262.99.80.9
Feb / -1°5272.910.61.3
Mar11° / 10011.72.911.72.8
Apr17° / 11412.10.712.95.0
May22° / 12°13212.6013.96.1
Jun25° / 17°14315.2014.55.6
Jul28° / 21°18618.2014.24.6
Aug29° / 22°14115.7013.44.5
Sep25° / 18°16714.5012.25.8
Oct20° / 12°16012.3011.15.9
Nov14° / 7980.1104.5
Dec / 5071.19.52.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 54% of the time in December, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 28%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16238
26337
36337
46436
56436
66535
76535
86733
96832
106931
117030
127030
137228
147228
157228
167327
177327
187525
197525
207525
217624
227723
237723
247723
257723
267723
277822
287921
297921
307921
317921

Chance of precipitation in December

Any precipitationSnow

Karasuyama gets around 50 mm of rain and snow over 7 wet days in December, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 22% and peaks near 27% on the wettest days, and about 1 day brings snow. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1272
2272
3272
4272
5263
6263
7253
8253
9243
10243
11234
12224
13224
14214
15214
16214
17204
18204
19204
20204
21204
22194
23194
24194
25194
26184
27184
28184
29184
30175
31175

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 7 km/h in December.

Across December, daily wind ranges from about 7 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
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 42 min at the start of December to 9 h 30 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 6:39 AM to 6:57 AM, and sunset from 4:19 PM to 4:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.76:394:19
29.76:404:19
39.66:414:19
49.66:414:19
59.66:424:19
69.66:434:19
79.66:444:19
89.66:454:19
99.66:464:19
109.66:464:19
119.56:474:20
129.56:484:20
139.56:484:20
149.56:494:20
159.56:504:20
169.56:504:21
179.56:514:21
189.56:524:21
199.56:524:22
209.56:534:22
219.56:534:23
229.56:544:23
239.56:544:24
249.56:554:24
259.56:554:25
269.56:554:25
279.56:564:26
289.56:564:26
299.56:564:27
309.56:574:28
319.56:574:28

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.35 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.35 kWh/m² to a high of 5.2 kWh/m² in May across the year — December's 2.35 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.3Moderate
22.3Moderate
32.3Moderate
42.3Moderate
52.3Moderate
62.3Moderate
72.3Moderate
82.3Moderate
92.3Moderate
102.3Moderate
112.3Moderate
122.3Moderate
132.3Moderate
142.3Moderate
152.3Moderate
162.4Moderate
172.4Moderate
182.4Moderate
192.4Moderate
202.4Moderate
212.4Moderate
222.4Moderate
232.5Moderate
242.5Moderate
252.5Moderate
262.5Moderate
272.5Moderate
282.5Moderate
292.6Moderate
302.6Moderate
312.6Moderate
Planning a trip in December

Hazard calendar for Karasuyama

In seasonPeak

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

Karasuyama 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 Karasuyama?

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

2.1
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 Karasuyama.

What to pack for Karasuyama in December

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

In December, Karasuyama sees daytime highs around 9°C and nights near 1°C. Pack a warm layer. About 7 days see rain.

a warm layer

Sea temperature near Karasuyama in December

The nearest coast averages about 16°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 52 km away) is warmest in August at about 24°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 24 to Oct 28 — about 4.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun19Cool
Jul22Refreshing
Aug24Warm
Sep23Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Karasuyama in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Karasuyama peaks around July 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 17UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Low

Air quality in Karasuyama 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 Karasuyama is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun16Moderate
Jul14Moderate
Aug13Moderate
Sep11Good
Oct11Good
Nov10Good
Dec9Good
Location & terrain

Where is Karasuyama?

Karasuyama sits at 36.6°N, 140.2°E, 119 m above sea level, in Japan. The nearest listed city is Nasukarasuyama, 1.0 km away.

Topography around Karasuyama

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

Within 3 km, the terrain around Karasuyama has only modest variations in elevation — a maximum elevation change of 193 m around an average of 110 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 483 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,553 m.

The land around Karasuyama is covered by trees (57%) and cropland (22%) within 3 km, trees (69%) and cropland (20%) within 16 km, and trees (58%) within 80 km.

3 km
193 m
16 km
483 m
80 km
2,553 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Nasukarasuyama 1.0 km · Ogawa 11 km · Hōshakuji 15 km · Sakura 16 km · Ujiie 17 km · Mashiko 21 km · Daigo 22 km · Hitachiomiya 24 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 Karasuyama (36.65°, 140.15°, elevation 119 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).