Kasai weather in December

In December, Kasai sees average daytime highs of 11°C and overnight lows near 3°C, with 59 mm of precipitation across 6 wet days and about 9.7 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 13°C in the first days to 9°C by the end. The sky is clear or mostly clear about 34% 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 42 min by month's end. Set against the rest of the year, December is Kasai's 1st-clearest and 8th-windiest month. For the whole year in context, see Kasai's year-round climate.

Daytime high
11°
10th warmest
Overnight low
3rd coldest
Precipitation
59 mm
6 wet days
Daylight
9 h 42 min
7:07 AM – 4:47 PM
Cloud cover
52%
1st clearest
Wind
9 km/h
8th windiest
Solar energy
2.32 kWh/m²
Travel score
2.8
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 13°C in the first days to 9°C by the end.

A typical December day in Kasai reaches about 11°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 14°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)
1135
2135
3134
4124
5124
6124
7124
8124
9113
10113
11113
12113
13113
14113
15103
16103
17102
18102
19102
20102
21102
22102
23102
2492
2592
2692
2792
2891
2991
3091
3191

How December really feels in Kasai

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 16 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
16
wind chill below the day's low

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

Kasai 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 / 475.919.91.5
Feb / 627.11.610.71.9
Mar13° / 117110.311.73.4
Apr18° / 13110.6012.95.6
May23° / 14°15110.8013.86.5
Jun26° / 18°18413.5014.35.8
Jul29° / 23°22916.4014.14.4
Aug31° / 24°14613.6013.34.1
Sep27° / 20°21412.5012.25.8
Oct22° / 14°1408.7011.16.9
Nov16° / 736.5010.25.5
Dec11° / 5960.39.72.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in December, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 27% of December, with mostly cloudy or overcast conditions the remaining 39%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26040
36040
46040
56040
66139
76139
86040
96040
106139
116139
126040
136040
146040
156040
166040
176139
186139
196139
206238
216238
226337
236238
246238
256337
266337
276337
286337
296238
306337
316238

Chance of precipitation in December

Any precipitationSnow

Kasai gets around 59 mm of rain and snow over 6 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 19% and peaks near 22% on the wettest days, and about 0 day brings snow.

0%10%20%30%151015202531
Rain chance (%)Snow chance (%)
1220
2220
3220
4210
5210
6210
7200
8200
9200
10190
11190
12190
13191
14181
15181
16181
17181
18181
19181
20181
21181
22182
23182
24182
25182
26172
27172
28172
29162
30162
31162

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 (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
101000
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 9 km/h in December.

Across December, daily wind ranges from about 9 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
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 48 min at the start of December to 9 h 42 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 6:56 AM to 7:13 AM, and sunset from 4:45 PM to 4:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.86:564:45
29.86:574:45
39.86:574:45
49.86:584:45
59.86:594:45
69.87:004:45
79.77:014:45
89.77:014:45
99.77:024:45
109.77:034:45
119.77:044:45
129.77:044:46
139.77:054:46
149.77:064:46
159.77:064:46
169.77:074:47
179.77:074:47
189.77:084:47
199.77:094:48
209.77:094:48
219.77:104:49
229.77:104:49
239.77:114:50
249.77:114:50
259.77:114:51
269.77:124:51
279.77:124:52
289.77:124:52
299.77:134:53
309.77:134:54
319.77:134:54

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.32 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.32 kWh/m² to a high of 5.64 kWh/m² in May across the year — December's 2.32 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.4Moderate
22.4Moderate
32.4Moderate
42.4Moderate
52.4Moderate
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
222.4Moderate
232.4Moderate
242.4Moderate
252.4Moderate
262.4Moderate
272.4Moderate
282.4Moderate
292.4Moderate
302.4Moderate
312.5Moderate
Planning a trip in December

Hazard calendar for Kasai

In seasonPeak

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

Kasai 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 Kasai?

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

2.8
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 Kasai.

What to pack for Kasai in December

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

In December, Kasai sees daytime highs around 11°C and nights near 3°C. Pack a warm layer. About 6 days see rain.

a warm layer

Sea temperature near Kasai 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 34 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 Jun 6 to Nov 13 — about 5.3 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Cool
Dec17Cool

UV index in Kasai 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 Kasai peaks around July 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 highModerateJul 12UV 10Dec 22UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Kasai 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 Kasai is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1622 µg/m³Oct 1811 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun18Moderate
Jul17Moderate
Aug17Moderate
Sep13Moderate
Oct11Good
Nov12Moderate
Dec12Good
Location & terrain

Where is Kasai?

Kasai sits at 34.9°N, 134.8°E, 66 m above sea level, in Japan. The nearest listed city is Nishitawara, 8.0 km away.

Topography around Kasai

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

Within 3 km, the terrain around Kasai has only modest variations in elevation — a maximum elevation change of 243 m around an average of 85 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 922 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,489 m.

The land around Kasai is covered by trees (36%), cropland (26%) and artificial surfaces (26%) within 3 km, trees (60%) within 16 km, and trees (60%) and water (23%) within 80 km.

3 km
243 m
16 km
922 m
80 km
1,489 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Nishitawara 8.0 km · Yashiro 11 km · Ono 12 km · Nishiwaki 13 km · Katō 16 km · Kajiya 17 km · Kakogawachō-honmachi 18 km · Himeji 18 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 Kasai (34.9263°, 134.8453°, elevation 66 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).