Kasama weather in December

In December, Kasama sees average daytime highs of 10°C and overnight lows near 2°C, with 57 mm of precipitation across 7.3 wet days and about 9.6 hours of daylight. It is the 10th-warmest and 11th-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 57% 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 36 min by month's end. Set against the rest of the year, December is Kasama's 1st-clearest and 8th-windiest month. For the whole year in context, see Kasama's year-round climate.

Daytime high
10°
10th warmest
Overnight low
3rd coldest
Precipitation
57 mm
7.3 wet days
Daylight
9 h 30 min
6:49 AM – 4:21 PM
Cloud cover
41%
1st clearest
Wind
8 km/h
8th windiest
Solar energy
2.37 kWh/m²
Travel score
2.7
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 Kasama reaches about 10°C in the afternoon and slips back to 2°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 5°C cooler than November and about 2°C warmer than January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1135
2124
3124
4124
5124
6124
7114
8113
9113
10113
11113
12113
13113
14102
15102
16102
17102
18102
19102
20102
21102
22102
2391
2491
2591
2691
2791
2891
2991
3091
3191

How December really feels in Kasama

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.

Kasama 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 / 566.71.69.81.6
Feb / 587.32.110.61.9
Mar12° / 10712.11.411.73.2
Apr17° / 11712.10.212.95.2
May22° / 13°14212.6013.96.1
Jun25° / 18°15215.3014.45.6
Jul28° / 22°18417.3014.24.7
Aug30° / 23°13715013.44.5
Sep26° / 19°17514.8012.25.7
Oct21° / 14°17912.4011.16.0
Nov15° / 888.5010.15.0
Dec10° / 577.30.39.62.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 57% of the time in December, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 29%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26238
36238
46238
56436
66436
76634
86634
96832
106931
117030
127030
137129
147129
157327
167327
177327
187426
197426
207525
217624
227624
237624
247624
257723
267723
277723
287723
297921
307921
317921

Chance of precipitation in December

Any precipitationSnow

Kasama gets around 57 mm of rain and snow over 7.3 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 (%)Snow chance (%)
1281
2281
3281
4281
5271
6271
7271
8261
9261
10251
11241
12241
13231
14231
15221
16221
17211
18211
19211
20201
21201
22201
23201
24191
25191
26191
27181
28182
29182
30182
31182

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
21000
31000
41000
51000
61000
71000
81000
91000
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 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 9 h 42 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 6 minutes over December. Sunrise moves from 6:38 AM to 6:56 AM, and sunset from 4:20 PM to 4:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.76:384:20
29.76:394:20
39.76:394:19
49.76:404:19
59.66:414:19
69.66:424:19
79.66:434:19
89.66:444:19
99.66:444:20
109.66:454:20
119.66:464:20
129.66:474:20
139.66:474:20
149.56:484:20
159.56:494:21
169.56:494:21
179.56:504:21
189.56:504:22
199.56:514:22
209.56:514:22
219.56:524:23
229.56:524:23
239.56:534:24
249.56:534:24
259.56:544:25
269.56:544:25
279.56:544:26
289.56:554:27
299.56:554:27
309.56:554:28
319.66:564:29

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.37 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.37 kWh/m² to a high of 5.23 kWh/m² in May across the year — December's 2.37 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
142.4Moderate
152.4Moderate
162.4Moderate
172.4Moderate
182.4Moderate
192.4Moderate
202.4Moderate
212.5Moderate
222.5Moderate
232.5Moderate
242.5Moderate
252.5Moderate
262.5Moderate
272.6Moderate
282.6Moderate
292.6Moderate
302.6Moderate
312.6Moderate
Planning a trip in December

Hazard calendar for Kasama

In seasonPeak

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

Kasama 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 Kasama?

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

2.7
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 Kasama.

What to pack for Kasama in December

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

In December, Kasama sees daytime highs around 10°C and nights near 2°C. Pack a warm layer. About 7 days see rain.

a warm layer

Sea temperature near Kasama 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 32 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 Kasama 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 Kasama peaks around July 24 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 24UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Kasama 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 Kasama 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 Kasama?

Kasama sits at 36.4°N, 140.3°E, 177 m above sea level, in Japan. The nearest listed city is Tomobe, 5.0 km away.

Topography around Kasama

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

Within 3 km, the terrain around Kasama has only modest variations in elevation — a maximum elevation change of 167 m around an average of 71 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 698 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,298 m.

The land around Kasama is covered by trees (58%) within 3 km, trees (66%) within 16 km, and trees (43%) and cropland (21%) within 80 km.

3 km
167 m
16 km
698 m
80 km
2,298 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Tomobe 5.0 km · Ishitsuka 15 km · Iwase 15 km · Mito 17 km · Okunoya 17 km · Omitama 18 km · Mashiko 18 km · Makabe 20 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 Kasama (36.3833°, 140.2667°, elevation 177 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).