Kasumi weather in December

In December, Kasumi sees average daytime highs of 10°C and overnight lows near 7°C, with 207 mm of precipitation across 22.4 wet days and about 9.6 hours of daylight. It is the 9th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 12°C in the first days to 9°C by the end. The sky is clear or mostly clear about 8% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 48 min at the start of December to 9 h 36 min by month's end. Set against the rest of the year, December is Kasumi's 8th-clearest and 2nd-windiest month. For the whole year in context, see Kasumi's year-round climate.

Daytime high
10°
9th warmest
Overnight low
4th coldest
Precipitation
207 mm
22.4 wet days
Daylight
9 h 36 min
7:10 AM – 4:46 PM
Cloud cover
68%
8th clearest
Wind
22 km/h
2nd windiest
Solar energy
1.99 kWh/m²
Travel score
1.8
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 12°C in the first days to 9°C by the end.

A typical December day in Kasumi reaches about 10°C in the afternoon and slips back to 7°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 14°C. Set against its neighbours, December runs about 5°C cooler than November and about 3°C warmer than January.

10°15°20°151015202531
Avg high (°C)Avg low (°C)
1139
2129
3129
4129
5128
6128
7128
8118
9118
10118
11118
12117
13117
14107
15107
16107
17107
18107
19107
20106
21106
22106
2396
2496
2596
2696
2796
2896
2996
3095
3195

How December really feels in Kasumi

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.

Kasumi weather by month

How December compares with the rest of the year at a glance. December is the 9th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 20023.97.19.90.8
Feb / 13517.85.610.70.9
Mar10° / 14215.71.811.72.1
Apr15° / 10°11611.5012.94.2
May19° / 15°14311.5013.95.9
Jun22° / 19°15612.6014.45.9
Jul26° / 23°18614.8014.25.8
Aug28° / 25°13212.5013.35.7
Sep25° / 22°20714.3012.26.0
Oct20° / 17°13912.3011.16.0
Nov15° / 12°13516010.14.0
Dec10° / 20722.43.19.61.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 26% of December, with mostly cloudy or overcast conditions the remaining 66%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13664
23565
33565
43565
53466
63466
73466
83367
93367
103466
113367
123367
133367
143367
153367
163466
173466
183565
193466
203466
213565
223565
233565
243565
253565
263565
273664
283466
293466
303466
313367

Chance of precipitation in December

Any precipitationSnow

Kasumi gets around 207 mm of rain and snow over 22.4 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 72% and peaks near 75% on the wettest days, and about 3 days bring snow. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)Snow chance (%)
1652
2663
3673
4683
5694
6704
7705
8716
9726
10727
11737
12738
13738
14739
15739
167310
177310
187311
197312
207312
217313
227314
237414
247414
257415
267415
277415
287416
297416
307516
317517

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 (%)Comfortable (%)
1982
2982
3982
4982
5991
6991
7991
8991
9991
10991
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 22 km/h in December.

Across December, daily wind ranges from about 21 km/h on the calmest days to 23 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
121breezy
221breezy
321breezy
422breezy
522breezy
622breezy
722breezy
822breezy
922breezy
1022breezy
1122breezy
1222breezy
1322breezy
1423breezy
1523breezy
1623breezy
1723breezy
1823breezy
1923breezy
2023breezy
2123breezy
2223breezy
2323breezy
2423breezy
2523breezy
2623breezy
2723breezy
2823breezy
2923breezy
3023breezy
3123breezy

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 48 min at the start of December to 9 h 36 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 6:58 AM to 7:16 AM, and sunset from 4:44 PM to 4:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.86:584:44
29.76:594:44
39.77:004:44
49.77:014:44
59.77:024:44
69.77:024:44
79.77:034:44
89.77:044:44
99.77:054:44
109.67:064:44
119.67:064:44
129.67:074:45
139.67:084:45
149.67:084:45
159.67:094:45
169.67:104:46
179.67:104:46
189.67:114:46
199.67:114:47
209.67:124:47
219.67:124:48
229.67:134:48
239.67:134:48
249.67:144:49
259.67:144:50
269.67:154:50
279.67:154:51
289.67:154:51
299.67:164:52
309.67:164:53
319.67:164:53

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.99 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.99 kWh/m² to a high of 5.59 kWh/m² in May across the year — December's 1.99 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.1Moderate
22.0Moderate
32.0Moderate
42.0Moderate
52.0Moderate
62.0Moderate
72.0Moderate
82.0Dim
92.0Dim
102.0Dim
112.0Dim
122.0Dim
132.0Dim
142.0Dim
152.0Dim
162.0Dim
172.0Dim
182.0Moderate
192.0Moderate
202.0Moderate
212.0Moderate
222.0Moderate
232.0Moderate
242.0Moderate
252.0Moderate
262.1Moderate
272.1Moderate
282.1Moderate
292.1Moderate
302.1Moderate
312.1Moderate
Planning a trip in December

Hazard calendar for Kasumi

In seasonPeak

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

Kasumi 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 Kasumi?

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

1.8
Sightseeing
10th-best month of the year
0.0
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Kasumi.

What to pack for Kasumi in December

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

In December, Kasumi sees daytime highs around 10°C and nights near 7°C. Pack a warm layer and rain gear. Worth having: a windbreaker. About 22 days see rain.

a warm layerrain geara windbreaker

Sea temperature near Kasumi 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 offshore is warmest in August at about 27°C and coldest in February near 12°C.

It's comfortable for a long swim from Jun 13 to Nov 7 — about 4.9 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb12Bracing
Mar12Bracing
Apr14Bracing
May17Cool
Jun20Refreshing
Jul24Warm
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Kasumi 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 Kasumi peaks around July 16 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highModerateJul 16UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Kasumi 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 Kasumi is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (September, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1221 µg/m³Sep 1710 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar20Moderate
Apr21Moderate
May18Moderate
Jun14Moderate
Jul12Good
Aug10Good
Sep10Good
Oct10Good
Nov11Good
Dec12Good
Location & terrain

Where is Kasumi?

Kasumi sits at 35.6°N, 134.6°E, 46 m above sea level, in Japan. The nearest listed city is Toyooka, 20 km away.

Topography around Kasumi

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

Within 3 km, the terrain around Kasumi has significant variations in elevation — a maximum elevation change of 375 m around an average of 86 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 955 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,487 m.

The land around Kasumi is covered by trees (70%) within 3 km, trees (57%) and water (40%) within 16 km, and trees (56%) and water (38%) within 80 km.

3 km
375 m
16 km
955 m
80 km
1,487 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Toyooka 20 km · Yabu 28 km · Kyōtango 37 km · Tottori-shi 39 km · Wadayama 41 km · Kōge 42 km · Yotsutsuji 44 km · Miyazu 52 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 Kasumi (35.6333°, 134.6333°, elevation 46 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).