Yao weather in December

In December, Yao sees average daytime highs of 12°C and overnight lows near 4°C, with 68 mm of precipitation across 8.4 wet days and about 9.7 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 14°C in the first days to 10°C by the end. The sky is clear or mostly clear about 35% 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 Yao's 1st-clearest and 5th-windiest month. For the whole year in context, see Yao's year-round climate.

Daytime high
12°
10th warmest
Overnight low
3rd coldest
Precipitation
68 mm
8.4 wet days
Daylight
9 h 42 min
7:03 AM – 4:45 PM
Cloud cover
51%
1st clearest
Wind
8 km/h
5th windiest
Solar energy
2.42 kWh/m²
Travel score
3.2
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 14°C in the first days to 10°C by the end.

A typical December day in Yao reaches about 12°C in the afternoon and slips back to 4°C overnight — a 8°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.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1146
2146
3146
4135
5135
6135
7135
8135
9125
10124
11124
12124
13124
14124
15124
16114
17114
18114
19113
20113
21113
22113
23113
24113
25103
26103
27103
28103
29103
30103
31103

How December really feels in Yao

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.

Yao 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 / 648.119.91.9
Feb10° / 698.61.110.72.3
Mar14° / 11211.60.111.73.8
Apr19° / 10°11410.4012.86.0
May24° / 15°13210.4013.86.7
Jun27° / 20°19913.6014.35.5
Jul31° / 24°17213.8014.14.1
Aug33° / 25°10010.4013.33.5
Sep29° / 21°15811.8012.25.3
Oct23° / 14°15610011.16.8
Nov17° / 848010.25.7
Dec12° / 688.40.29.73.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in December, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 28% of December, with mostly cloudy or overcast conditions the remaining 37%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26139
36139
46238
56238
66238
76337
86337
96337
106337
116337
126337
136337
146337
156238
166238
176337
186238
196337
206337
216436
226337
236436
246436
256436
266436
276535
286436
296535
306535
316535

Chance of precipitation in December

Any precipitationSnow

Yao gets around 68 mm of rain and snow over 8.4 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 26% and peaks near 27% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1260
2260
3260
4260
5260
6260
7270
8270
9270
10270
11270
12270
13260
14260
15260
16260
17260
18260
19261
20261
21261
22261
23261
24261
25261
26262
27252
28252
29252
30252
31242

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 (%)
19811
29811
39811
49811
59910
69910
79910
89910
99910
109910
1110000
1210000
1310000
1410000
1510000
1610000
1710000
1810000
1910000
2010000
2110000
2210000
2310000
2410000
2510000
2610000
2710000
2810000
2910000
3010000
3110000

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 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
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
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

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 6:52 AM to 7:09 AM, and sunset from 4:43 PM to 4:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.86:524:43
29.86:534:43
39.86:544:43
49.86:544:43
59.86:554:43
69.86:564:43
79.86:574:43
89.86:584:43
99.76:584:43
109.76:594:43
119.77:004:43
129.77:004:43
139.77:014:44
149.77:024:44
159.77:024:44
169.77:034:45
179.77:044:45
189.77:044:45
199.77:054:46
209.77:054:46
219.77:064:46
229.77:064:47
239.77:074:47
249.77:074:48
259.77:084:48
269.77:084:49
279.77:084:50
289.77:094:50
299.77:094:51
309.77:094:51
319.77:094:52

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.42 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.42 kWh/m² to a high of 5.49 kWh/m² in May across the year — December's 2.42 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.5Moderate
22.5Moderate
32.5Moderate
42.5Moderate
52.5Moderate
62.4Moderate
72.4Moderate
82.4Moderate
92.4Moderate
102.4Moderate
112.4Moderate
122.4Moderate
132.4Moderate
142.4Moderate
152.4Moderate
162.4Moderate
172.4Moderate
182.4Moderate
192.4Moderate
202.4Moderate
212.4Moderate
222.5Moderate
232.5Moderate
242.5Moderate
252.5Moderate
262.5Moderate
272.5Moderate
282.5Moderate
292.5Moderate
302.5Moderate
312.6Moderate
Planning a trip in December

Hazard calendar for Yao

In seasonPeak

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

Yao 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 Yao?

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

3.2
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 Yao.

What to pack for Yao in December

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

In December, Yao sees daytime highs around 12°C and nights near 4°C. Pack a warm layer. Worth having: rain gear. About 8 days see rain.

a warm layerrain gear

Sea temperature near Yao in December

The nearest coast averages about 17°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 21 km away) is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 6 to Nov 11 — about 5.2 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Cool
Dec17Cool

UV index in Yao 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 Yao peaks around July 10 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 highModerateJul 10UV 10Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Yao 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 Yao is worst in April — around 23 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (October, 13 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1423 µg/m³Oct 1713 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb17Moderate
Mar22Moderate
Apr23Moderate
May22Moderate
Jun19Moderate
Jul17Moderate
Aug18Moderate
Sep14Moderate
Oct13Moderate
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Yao?

Yao sits at 34.6°N, 135.6°E, 13 m above sea level, in Japan. The nearest listed city is Kashihara, 4.0 km away.

Topography around Yao

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

Within 3 km, the terrain around Yao has only modest variations in elevation — a maximum elevation change of 29 m around an average of 12 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 674 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,879 m.

The land around Yao is covered by artificial surfaces (93%) within 3 km, artificial surfaces (66%) and trees (23%) within 16 km, and trees (66%) within 80 km.

3 km
29 m
16 km
674 m
80 km
1,879 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Kashihara 4.0 km · Fujiidera 5.0 km · Higashiosaka 6.0 km · Habikino 7.0 km · Matsubara 7.0 km · Tatsuno-kita 9.0 km · Fuki 9.0 km · Oji 10 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 Yao (34.6167°, 135.6°, elevation 13 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).