Yanagawamachi-saiwaichō weather in December

In December, Yanagawamachi-saiwaichō sees average daytime highs of 6°C and overnight lows near -1°C, with 55 mm of precipitation across 11.1 wet days and about 9.4 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 8°C in the first days to 4°C by the end. The sky is clear or mostly clear about 22% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 36 min at the start of December to 9 h 24 min by month's end. Set against the rest of the year, December is Yanagawamachi-saiwaichō's 2nd-clearest and 4th-windiest month. For the whole year in context, see Yanagawamachi-saiwaichō's year-round climate.

Daytime high
10th warmest
Overnight low
-1°
3rd coldest
Precipitation
55 mm
11.1 wet days
Daylight
9 h 24 min
6:52 AM – 4:15 PM
Cloud cover
60%
2nd clearest
Wind
10 km/h
4th windiest
Solar energy
2.12 kWh/m²
Travel score
0.5
out of 10

Yanagawamachi-saiwaichō is human settlement in Japan.

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 8°C in the first days to 4°C by the end.

A typical December day in Yanagawamachi-saiwaichō reaches about 6°C in the afternoon and slips back to -1°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 2°C and 10°C. Set against its neighbours, December runs about 6°C cooler than November and about 3°C warmer than January.

-10°-5°10°15°151015202531
Avg high (°C)Avg low (°C)
181
281
381
481
581
670
770
870
970
1070
1160
1260
136-1
146-1
156-1
166-1
176-1
185-1
195-1
205-1
215-1
225-2
235-2
245-2
255-2
264-2
274-2
284-2
294-2
304-2
314-2

How December really feels in Yanagawamachi-saiwaichō

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 31 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
31
wind chill below the day's low

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

Yanagawamachi-saiwaichō 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 / -4°641110.69.70.0
Feb / -3°519.58.210.50.0
Mar / -1°9012.26.611.71.2
Apr14° / 9911.91.6133.9
May19° / 10°10611.90145.8
Jun22° / 15°13314.3014.65.7
Jul26° / 19°19318.5014.45.1
Aug27° / 20°16316.5013.55.4
Sep23° / 16°16914.3012.35.8
Oct18° / 10°14411.30115.4
Nov12° / 679.30.9103.1
Dec / -1°5511.17.19.40.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 31% of December, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24852
34852
44852
54753
64753
74852
84852
94951
104951
114951
125050
135149
145149
155149
165248
175347
185446
195446
205545
215644
225743
235743
245743
255743
265842
275842
285842
295842
305743
315743

Chance of precipitation in December

Any precipitationSnow

Yanagawamachi-saiwaichō gets around 55 mm of rain and snow over 11.1 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 35% and peaks near 37% on the wettest days, and about 7 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1319
23210
33211
43312
53314
63415
73516
83618
93619
103720
113721
123721
133722
143622
153623
163623
173624
183624
193625
203625
213526
223526
233527
243527
253528
263529
273530
283531
293532
303632
313633

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 10 km/h in December.

Across December, daily wind ranges from about 9 km/h on the calmest days to 11 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
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 36 min at the start of December to 9 h 24 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 6:40 AM to 6:58 AM, and sunset from 4:14 PM to 4:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.66:404:14
29.66:414:14
39.56:424:14
49.56:434:14
59.56:444:14
69.56:454:14
79.56:454:14
89.56:464:14
99.56:474:14
109.46:484:14
119.46:494:14
129.46:494:15
139.46:504:15
149.46:514:15
159.46:514:15
169.46:524:15
179.46:534:16
189.46:534:16
199.46:544:17
209.46:544:17
219.46:554:17
229.46:554:18
239.46:564:18
249.46:564:19
259.46:574:19
269.46:574:20
279.46:574:21
289.46:584:21
299.46:584:22
309.46:584:22
319.46:584:23

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.12 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.12 kWh/m² to a high of 5.36 kWh/m² in May across the year — December's 2.12 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.1Moderate
22.1Moderate
32.1Moderate
42.1Moderate
52.1Moderate
62.1Moderate
72.1Moderate
82.1Moderate
92.1Moderate
102.1Moderate
112.1Moderate
122.1Moderate
132.1Moderate
142.1Moderate
152.1Moderate
162.1Moderate
172.1Moderate
182.1Moderate
192.2Moderate
202.2Moderate
212.2Moderate
222.2Moderate
232.2Moderate
242.2Moderate
252.3Moderate
262.3Moderate
272.3Moderate
282.3Moderate
292.3Moderate
302.3Moderate
312.3Moderate
Planning a trip in December

Hazard calendar for Yanagawamachi-saiwaichō

In seasonPeak

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

Yanagawamachi-saiwaichō sits in the Pacific typhoon belt; the season peaks July–October.

Yanagawamachi-saiwaichō's rainy season runs March–October, 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 Yanagawamachi-saiwaichō?

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

0.5
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 Yanagawamachi-saiwaichō.

What to pack for Yanagawamachi-saiwaichō in December

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

In December, Yanagawamachi-saiwaichō sees daytime highs around 6°C and nights near -1°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 11 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Yanagawamachi-saiwaichō in December

The nearest coast averages about 14°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 46 km away) is warmest in August at about 24°C and coldest in March near 9°C.

It's comfortable for a long swim from Jul 7 to Oct 10 — about 3.2 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb9Bracing
Mar9Bracing
Apr11Bracing
May14Bracing
Jun18Cool
Jul21Refreshing
Aug24Refreshing
Sep23Refreshing
Oct19Cool
Nov17Cool
Dec14Bracing

UV index in Yanagawamachi-saiwaichō 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 Yanagawamachi-saiwaichō peaks around August 13 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 13UV 10Jan 10UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun8Very high
Jul9Very high
Aug10Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Yanagawamachi-saiwaichō 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 Yanagawamachi-saiwaichō is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1721 µg/m³Dec 1810 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar20Moderate
Apr21Moderate
May20Moderate
Jun16Moderate
Jul14Moderate
Aug12Good
Sep11Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Yanagawamachi-saiwaichō?

Yanagawamachi-saiwaichō sits at 37.9°N, 140.6°E, 44 m above sea level, in Japan. The nearest listed city is Hobaramachi, 6.0 km away.

Topography around Yanagawamachi-saiwaichō

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

Within 3 km, the terrain around Yanagawamachi-saiwaichō has only modest variations in elevation — a maximum elevation change of 188 m around an average of 62 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 898 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,075 m.

The land around Yanagawamachi-saiwaichō is covered by trees (41%) and cropland (32%) within 3 km, trees (82%) within 16 km, and trees (64%) and water (20%) within 80 km.

3 km
188 m
16 km
898 m
80 km
2,075 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Hobaramachi 6.0 km · Date 10 km · Fukushima 16 km · Shiroishi 17 km · Kakuda 20 km · Ōkawara 25 km · Sōma 30 km · Watari 30 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 Yanagawamachi-saiwaichō (37.85°, 140.6°, elevation 44 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).