Sanyōonoda weather in December

In December, Sanyōonoda sees average daytime highs of 12°C and overnight lows near 7°C, with 74 mm of precipitation across 11 wet days and about 9.8 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 10°C by the end. The sky is clear or mostly clear about 21% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 54 min at the start of December to 9 h 48 min by month's end. Set against the rest of the year, December is Sanyōonoda's 8th-clearest and 2nd-windiest month. For the whole year in context, see Sanyōonoda's year-round climate.

Daytime high
12°
10th warmest
Overnight low
3rd coldest
Precipitation
74 mm
11 wet days
Daylight
9 h 42 min
7:19 AM – 5:04 PM
Cloud cover
62%
8th clearest
Wind
15 km/h
2nd windiest
Solar energy
2.15 kWh/m²
Travel score
2.9
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 10°C by the end.

A typical December day in Sanyōonoda reaches about 12°C in the afternoon and slips back to 7°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 7°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)
1149
2149
3139
4139
5139
6139
7138
8128
9128
10128
11128
12128
13128
14127
15117
16117
17117
18117
19117
20117
21117
22117
23117
24117
25116
26106
27106
28106
29106
30106
31106

How December really feels in Sanyōonoda

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.

Sanyōonoda 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 / 7310.81.3101.8
Feb10° / 8110.41.110.72.1
Mar13° / 13311.50.211.73.4
Apr17° / 12°14710.7012.85.3
May21° / 16°16610.2013.76.5
Jun25° / 20°26914.1014.25.9
Jul28° / 24°25614.50145.1
Aug30° / 25°14111.9013.34.9
Sep27° / 22°16211.4012.26.2
Oct22° / 17°1007.8011.17.1
Nov17° / 12°868.4010.25.5
Dec12° / 74110.39.82.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 23% of December, with mostly cloudy or overcast conditions the remaining 57%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25149
35149
45050
54951
64951
74753
84852
94654
104654
114456
124456
134357
144258
154258
164060
174060
184060
194060
204060
213961
223961
234060
244060
254060
264060
274159
284159
294159
304159
314060

Chance of precipitation in December

Any precipitationSnow

Sanyōonoda gets around 74 mm of rain and snow over 11 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 36% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1330
2330
3330
4340
5340
6340
7350
8350
9350
10361
11361
12361
13361
14361
15361
16361
17361
18361
19361
20361
21361
22352
23352
24352
25352
26342
27342
28332
29332
30322
31322

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 (%)Humid (%)
19631
29730
39730
49730
59820
69820
79820
89910
99910
109910
119910
129910
139910
149910
159910
169910
179910
1810000
1910000
2010000
2110000
2210000
2310000
2410000
2510000
2610000
2710000
2810000
2910000
3010000
3110000

Wind in December

Winds average 15 km/h in December.

Across December, daily wind ranges from about 14 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze
3116light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 54 min at the start of December to 9 h 48 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 7:08 AM to 7:26 AM, and sunset from 5:02 PM to 5:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.97:085:02
29.97:095:02
39.97:105:02
49.97:115:02
59.87:115:02
69.87:125:02
79.87:135:02
89.87:145:02
99.87:155:02
109.87:155:02
119.87:165:03
129.87:175:03
139.87:175:03
149.87:185:03
159.77:195:04
169.77:195:04
179.77:205:04
189.77:205:05
199.77:215:05
209.77:215:05
219.77:225:06
229.77:225:06
239.77:235:07
249.77:235:07
259.77:245:08
269.77:245:08
279.77:245:09
289.77:255:09
299.77:255:10
309.87:255:11
319.87:265:11

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.15 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.15 kWh/m² to a high of 5.52 kWh/m² in May across the year — December's 2.15 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.3Moderate
22.3Moderate
32.3Moderate
42.2Moderate
52.2Moderate
62.2Moderate
72.2Moderate
82.2Moderate
92.2Moderate
102.1Moderate
112.1Moderate
122.1Moderate
132.1Moderate
142.1Moderate
152.1Moderate
162.1Moderate
172.1Moderate
182.1Moderate
192.1Moderate
202.1Moderate
212.1Moderate
222.1Moderate
232.1Moderate
242.2Moderate
252.2Moderate
262.2Moderate
272.2Moderate
282.2Moderate
292.2Moderate
302.2Moderate
312.2Moderate
Planning a trip in December

Hazard calendar for Sanyōonoda

In seasonPeak

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

Sanyōonoda 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 Sanyōonoda?

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

2.9
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 Sanyōonoda.

What to pack for Sanyōonoda in December

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

In December, Sanyōonoda sees daytime highs around 12°C and nights near 7°C. Pack a warm layer. Worth having: rain gear. About 11 days see rain.

a warm layerrain gear

Sea temperature near Sanyōonoda 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 18 km away) is warmest in August at about 27°C and coldest in February near 12°C.

It's comfortable for a long swim from Jun 6 to Nov 10 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar12Bracing
Apr14Bracing
May17Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov19Cool
Dec16Cool

UV index in Sanyōonoda in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sanyōonoda peaks around June 20 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJun 20UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr8Very high
May8Very high
Jun10Very high
Jul9Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Sanyōonoda 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 Sanyōonoda is worst in March — around 27 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2026 µg/m³Oct 1212 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar27Moderate
Apr24Moderate
May21Moderate
Jun18Moderate
Jul16Moderate
Aug19Moderate
Sep13Moderate
Oct12Good
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Sanyōonoda?

Sanyōonoda sits at 34.0°N, 131.2°E, 33 m above sea level, in Japan. The nearest listed city is Onoda, 4.0 km away.

Topography around Sanyōonoda

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

Within 3 km, the terrain around Sanyōonoda has only modest variations in elevation — a maximum elevation change of 147 m around an average of 30 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 475 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,205 m.

The land around Sanyōonoda is covered by trees (55%) and artificial surfaces (20%) within 3 km, trees (51%) and water (30%) within 16 km, and water (49%) and trees (42%) within 80 km.

3 km
147 m
16 km
475 m
80 km
1,205 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Onoda 4.0 km · Ube 13 km · Mine 18 km · Shimonoseki 22 km · Ogōri-shimogō 23 km · Kanda 32 km · Yamaguchi 33 km · Kitakyushu 35 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 Sanyōonoda (34.0325°, 131.1603°, elevation 33 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).