Izunokuni weather in December

In December, Izunokuni sees average daytime highs of 11°C and overnight lows near 6°C, with 83 mm of precipitation across 8.2 wet days and about 9.7 hours of daylight. It is the 10th-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 13°C in the first days to 10°C by the end. The sky is clear or mostly clear about 53% 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 Izunokuni's 1st-clearest and 4th-windiest month. For the whole year in context, see Izunokuni's year-round climate.

Daytime high
11°
10th warmest
Overnight low
4th coldest
Precipitation
83 mm
8.2 wet days
Daylight
9 h 42 min
6:51 AM – 4:30 PM
Cloud cover
41%
1st clearest
Wind
10 km/h
4th windiest
Solar energy
2.44 kWh/m²
Travel score
3.2
out of 10

Izunokuni is city in Shizuoka Prefecture, Japan.

Density
513/km²
people per km²
Founded
2005

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 13°C in the first days to 10°C by the end.

A typical December day in Izunokuni reaches about 11°C in the afternoon and slips back to 6°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 15°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)
1138
2138
3138
4138
5138
6138
7127
8127
9127
10127
11127
12127
13126
14116
15116
16116
17116
18116
19116
20116
21115
22115
23115
24105
25105
26105
27105
28105
29105
30105
31104

How December really feels in Izunokuni

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.

Izunokuni 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 / 927.91.39.91.9
Feb / 1059.11.410.72.0
Mar12° / 17913.90.811.73.0
Apr17° / 10°17212.5012.94.9
May21° / 15°18812.2013.85.9
Jun24° / 18°24916.2014.35.5
Jul27° / 22°22815.2014.15.3
Aug29° / 24°15614.5013.35.1
Sep26° / 21°23315.1012.25.8
Oct21° / 16°24713.1011.16.0
Nov16° / 11°13410.1010.25.1
Dec11° / 838.20.19.73.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 53% of the time in December, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 33%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25941
36040
46139
56139
66238
76238
86337
96436
106436
116535
126535
136634
146634
156634
166733
176733
186931
196931
207030
217030
227030
237129
247129
257228
267228
277327
287327
297327
307327
317327

Chance of precipitation in December

Any precipitation

Izunokuni gets around 83 mm of rain and snow over 8.2 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 26% and peaks near 33% 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 (%)
133
232
332
432
531
631
730
830
929
1028
1128
1227
1327
1426
1526
1625
1725
1824
1924
2024
2123
2223
2323
2422
2522
2621
2721
2821
2921
3021
3121

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 99% 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
5982
6982
7991
8991
9991
10991
11991
12991
13991
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 10 km/h in December.

Across December, daily wind ranges from about 10 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

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 6:40 AM to 6:57 AM, and sunset from 4:28 PM to 4:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.86:404:28
29.86:404:28
39.86:414:28
49.86:424:28
59.86:434:28
69.76:444:28
79.76:444:28
89.76:454:28
99.76:464:28
109.76:474:29
119.76:474:29
129.76:484:29
139.76:494:29
149.76:494:29
159.76:504:30
169.76:514:30
179.76:514:30
189.66:524:31
199.66:524:31
209.66:534:31
219.66:534:32
229.66:544:32
239.66:544:33
249.66:554:33
259.66:554:34
269.66:564:34
279.76:564:35
289.76:564:36
299.76:574:36
309.76:574:37
319.76:574:38

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.44 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.44 kWh/m² to a high of 5.45 kWh/m² in May across the year — December's 2.44 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.4Moderate
22.4Moderate
32.4Moderate
42.4Moderate
52.4Moderate
62.4Moderate
72.4Moderate
82.4Moderate
92.4Moderate
102.4Moderate
112.4Moderate
122.4Moderate
132.4Moderate
142.4Moderate
152.5Moderate
162.5Moderate
172.5Moderate
182.5Moderate
192.5Moderate
202.5Moderate
212.5Moderate
222.5Moderate
232.5Moderate
242.6Moderate
252.6Moderate
262.6Moderate
272.6Moderate
282.6Moderate
292.6Moderate
302.6Moderate
312.7Moderate
Planning a trip in December

Hazard calendar for Izunokuni

In seasonPeak

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

Izunokuni 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 Izunokuni?

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

3.2
Sightseeing
9th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Izunokuni.

What to pack for Izunokuni in December

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

In December, Izunokuni sees daytime highs around 11°C and nights near 6°C. Pack a warm layer. Worth having: rain gear. About 8 days see rain.

a warm layerrain gear

Sea temperature near Izunokuni in December

The nearest coast averages about 18°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 18 km away) is warmest in August at about 26°C and coldest in February near 15°C.

It's comfortable for a long swim from May 31 to Nov 26 — about 5.9 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar16Cool
Apr17Cool
May19Cool
Jun21Refreshing
Jul24Refreshing
Aug26Warm
Sep25Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Izunokuni 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 Izunokuni peaks around July 19 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 highExtremeVery highModerateJul 19UV 10Dec 23UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun10Very high
Jul10Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Izunokuni 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 Izunokuni is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1623 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb20Moderate
Mar20Moderate
Apr23Moderate
May20Moderate
Jun17Moderate
Jul13Moderate
Aug12Good
Sep12Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Izunokuni?

Izunokuni sits at 35.0°N, 139.0°E, 17 m above sea level, in Japan. The nearest listed city is Kamizawa, 7.0 km away.

Topography around Izunokuni

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

Within 3 km, the terrain around Izunokuni has significant variations in elevation — a maximum elevation change of 339 m around an average of 91 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 971 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,736 m.

The land around Izunokuni is covered by trees (58%) and artificial surfaces (25%) within 3 km, trees (66%) within 16 km, and water (50%) and trees (39%) within 80 km.

3 km
339 m
16 km
971 m
80 km
3,736 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Kamizawa 7.0 km · Izu 8.0 km · Shuzenji 8.0 km · Mishima 9.0 km · Fushimi 10 km · Numazu 10 km · Atami 11 km · Nakatogari 12 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 Izunokuni (35.0391°, 138.9514°, elevation 17 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).