Hakonegasaki weather in December

In December, Hakonegasaki sees average daytime highs of 10°C and overnight lows near 1°C, with 68 mm of precipitation across 8.3 wet days and about 9.6 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 55% 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 Hakonegasaki's 2nd-clearest and 7th-windiest month. For the whole year in context, see Hakonegasaki's year-round climate.

Daytime high
10°
10th warmest
Overnight low
3rd coldest
Precipitation
68 mm
8.3 wet days
Daylight
9 h 36 min
6:51 AM – 4:26 PM
Cloud cover
42%
2nd clearest
Wind
6 km/h
7th windiest
Solar energy
2.39 kWh/m²
Travel score
2.2
out of 10

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 Hakonegasaki reaches about 10°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 3°C warmer than January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1124
2114
3113
4113
5113
6113
7113
8102
9102
10102
11102
12102
13102
14101
1591
1691
1791
1891
1991
2091
2191
2290
2390
2490
2580
2680
2780
2880
2980
3080
3180

How December really feels in Hakonegasaki

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 20 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
20
wind chill below the day's low

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

Hakonegasaki 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 / -2°778.54.49.91.0
Feb / -1°759.64.610.61.2
Mar11° / 13915.24.711.72.5
Apr16° / 14614.60.912.94.5
May21° / 13°16615.6013.95.5
Jun23° / 17°22219.5014.44.9
Jul27° / 21°24321.8014.24.5
Aug28° / 22°20521013.44.4
Sep25° / 18°24918.3012.25.2
Oct19° / 13°24216.2011.15.2
Nov14° / 10111.30.210.14.1
Dec10° / 688.31.49.62.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 30%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26139
36139
46238
56337
66436
76535
86634
96634
106733
116832
126832
136931
146931
157030
167030
177129
187129
197228
207327
217327
227426
237426
247426
257525
267525
277525
287723
297723
307723
317723

Chance of precipitation in December

Any precipitationSnow

Hakonegasaki gets around 68 mm of rain and snow over 8.3 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 27% and peaks near 36% on the wettest days, and about 1 day brings snow. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1362
2362
3353
4343
5343
6333
7323
8313
9313
10304
11294
12284
13274
14274
15264
16255
17255
18245
19245
20235
21235
22235
23226
24226
25216
26216
27216
28216
29216
30216
31217

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 6 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

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 6:40 AM to 6:58 AM, and sunset from 4:25 PM to 4:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.86:404:25
29.76:414:25
39.76:414:25
49.76:424:25
59.76:434:25
69.76:444:25
79.76:454:25
89.76:464:25
99.66:464:25
109.66:474:25
119.66:484:25
129.66:484:25
139.66:494:26
149.66:504:26
159.66:504:26
169.66:514:26
179.66:524:27
189.66:524:27
199.66:534:27
209.66:534:28
219.66:544:28
229.66:544:29
239.66:554:29
249.66:554:30
259.66:564:30
269.66:564:31
279.66:564:31
289.66:574:32
299.66:574:33
309.66:574:33
319.66:584:34

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.39 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.39 kWh/m² to a high of 5.06 kWh/m² in May across the year — December's 2.39 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
122.4Moderate
132.4Moderate
142.4Moderate
152.4Moderate
162.4Moderate
172.4Moderate
182.4Moderate
192.4Moderate
202.5Moderate
212.5Moderate
222.5Moderate
232.5Moderate
242.5Moderate
252.6Moderate
262.6Moderate
272.6Moderate
282.6Moderate
292.6Moderate
302.7Moderate
312.7Moderate
Planning a trip in December

Hazard calendar for Hakonegasaki

In seasonPeak

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

Hakonegasaki 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 Hakonegasaki?

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

2.2
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 Hakonegasaki.

What to pack for Hakonegasaki in December

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

In December, Hakonegasaki sees daytime highs around 10°C and nights near 1°C. Pack a warm layer. Worth having: rain gear. About 8 days see rain.

a warm layerrain gear

Sea temperature near Hakonegasaki 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 50 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 3 — about 4.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Hakonegasaki 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 Hakonegasaki peaks around July 16 at about 10 (very high) — 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 highModerateJul 16UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Hakonegasaki 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 Hakonegasaki is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1426 µg/m³Dec 1814 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb21Moderate
Mar25Moderate
Apr26Moderate
May24Moderate
Jun20Moderate
Jul17Moderate
Aug16Moderate
Sep16Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Hakonegasaki?

Hakonegasaki sits at 35.8°N, 139.4°E, 138 m above sea level, in Japan. The nearest listed city is Hamura, 3.0 km away.

Topography around Hakonegasaki

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

Within 3 km, the terrain around Hakonegasaki has only modest variations in elevation — a maximum elevation change of 83 m around an average of 146 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 768 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,737 m.

The land around Hakonegasaki is covered by artificial surfaces (57%) and trees (29%) within 3 km, artificial surfaces (48%) and trees (42%) within 16 km, and trees (45%) and artificial surfaces (28%) within 80 km.

3 km
83 m
16 km
768 m
80 km
3,737 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Hamura 3.0 km · Yokota 4.0 km · Fussa 4.0 km · Iruma 6.0 km · Akishima 6.0 km · Musashimurayama 7.0 km · Higashiyamato 9.0 km · Tachikawa 9.0 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 Hakonegasaki (35.7694°, 139.3511°, elevation 138 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).