Santyoku weather in December

In December, Santyoku sees average daytime highs of 7°C and overnight lows near 2°C, with 44 mm of precipitation across 5.8 wet days and about 9.5 hours of daylight. It is the 10th-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 9°C in the first days to 5°C by the end. The sky is clear or mostly clear about 59% 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 30 min by month's end. Set against the rest of the year, December is Santyoku's 1st-clearest and 2nd-windiest month. For the whole year in context, see Santyoku's year-round climate.

Daytime high
10th warmest
Overnight low
3rd coldest
Precipitation
44 mm
5.8 wet days
Daylight
9 h 24 min
7:37 AM – 5:02 PM
Cloud cover
37%
1st clearest
Wind
18 km/h
2nd windiest
Solar energy
2.4 kWh/m²
Travel score
0.9
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 9°C in the first days to 5°C by the end.

A typical December day in Santyoku reaches about 7°C in the afternoon and slips back to 2°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 2°C and 11°C. Set against its neighbours, December runs about 6°C cooler than November and about 3°C warmer than January.

-5°10°15°151015202531
Avg high (°C)Avg low (°C)
195
295
394
484
584
684
784
883
973
1073
1173
1273
1373
1472
1572
1662
1762
1862
1962
2062
2162
2262
2362
2461
2561
2661
2761
2851
2951
3051
3151

How December really feels in Santyoku

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 26 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
26
wind chill below the day's low

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

Santyoku 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 / -0°527.14.39.70.0
Feb / 486.83.810.60.3
Mar / 638.6311.72.0
Apr14° / 727.70.412.94.4
May18° / 14°767.30146.2
Jun21° / 18°907.9014.56.7
Jul24° / 22°17612.2014.36.4
Aug25° / 23°18412.7013.46.3
Sep22° / 19°18210.6012.36.5
Oct18° / 14°857.70116.3
Nov12° / 667.60.4103.7
Dec / 445.81.79.50.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 59% of the time in December, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 11% 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 (%)
16535
26535
36634
46634
56634
66733
76832
86832
96832
106931
116931
127030
137030
147030
157030
167030
177129
187129
197129
207129
217129
227129
237327
247327
257327
267327
277327
287327
297327
307327
317327

Chance of precipitation in December

Any precipitationSnow

Santyoku gets around 44 mm of rain and snow over 5.8 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 20% and peaks near 25% on the wettest days, and about 2 days bring snow. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1254
2254
3244
4244
5244
6234
7224
8224
9214
10215
11205
12205
13205
14195
15195
16195
17185
18185
19186
20176
21176
22176
23177
24177
25177
26177
27178
28178
29178
30179
31179

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 18 km/h in December.

Across December, daily wind ranges from about 17 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2217light breeze
2317light breeze
2417light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze
3118light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 36 min at the start of December to 9 h 30 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 7:25 AM to 7:43 AM, and sunset from 5:01 PM to 5:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.67:255:01
29.67:265:01
39.67:275:01
49.67:285:01
59.57:285:01
69.57:295:01
79.57:305:01
89.57:315:01
99.57:325:01
109.57:325:01
119.57:335:01
129.57:345:01
139.57:355:02
149.47:355:02
159.47:365:02
169.47:375:02
179.47:375:03
189.47:385:03
199.47:385:03
209.47:395:04
219.47:395:04
229.47:405:05
239.47:405:05
249.47:415:06
259.47:415:06
269.47:425:07
279.47:425:07
289.47:425:08
299.47:425:09
309.47:435:09
319.57:435:10

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.4 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.4 kWh/m² to a high of 6 kWh/m² in May across the year — December's 2.4 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
152.4Moderate
162.4Moderate
172.4Moderate
182.4Moderate
192.4Moderate
202.4Moderate
212.4Moderate
222.4Moderate
232.4Moderate
242.5Moderate
252.5Moderate
262.5Moderate
272.5Moderate
282.5Moderate
292.5Moderate
302.5Moderate
312.5Moderate
Planning a trip in December

Hazard calendar for Santyoku

In seasonPeak

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

Santyoku sits in the Pacific typhoon belt; the season peaks July–October.

Santyoku's rainy season runs June–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 Santyoku?

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

0.9
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 Santyoku.

What to pack for Santyoku in December

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

In December, Santyoku sees daytime highs around 7°C and nights near 2°C. Pack a warm layer. Worth having: a heavy coat. About 6 days see rain.

a warm layera heavy coat

Sea temperature near Santyoku 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 19 km away) is warmest in August at about 24°C and coldest in February near 11°C.

It's comfortable for a long swim from Jul 1 to Oct 17 — about 3.6 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb11Bracing
Mar11Bracing
Apr13Bracing
May15Cool
Jun19Cool
Jul22Refreshing
Aug24Warm
Sep23Refreshing
Oct20Refreshing
Nov17Cool
Dec14Bracing

UV index in Santyoku 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 Santyoku peaks around August 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateAug 16UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May7High
Jun7High
Jul8Very high
Aug9Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Santyoku 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 Santyoku is worst in March — around 40 µg/m³ PM2.5 (poor), about 2.4× the cleanest month (September, 17 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMar 2239 µg/m³Sep 1817 µg/m³
PM2.5 (µg/m³)Level
Jan26Moderate
Feb30Moderate
Mar40Poor
Apr38Poor
May35Moderate
Jun30Moderate
Jul24Moderate
Aug21Moderate
Sep17Moderate
Oct20Moderate
Nov24Moderate
Dec22Moderate
Location & terrain

Where is Santyoku?

Santyoku sits at 37.4°N, 129.2°E, 23 m above sea level, in South Korea. The nearest listed city is Donghae City, 13 km away.

GangneungJumunjinNeietsuPyeongchangYeongjuSokcho

Topography around Santyoku

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

Within 3 km, the terrain around Santyoku has significant variations in elevation — a maximum elevation change of 265 m around an average of 50 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,347 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,549 m.

The land around Santyoku is covered by trees (50%), water (22%) and artificial surfaces (20%) within 3 km, trees (47%) and water (44%) within 16 km, and trees (62%) and water (33%) within 80 km.

3 km
265 m
16 km
1,347 m
80 km
1,549 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Donghae City 13 km · T’aebaek 34 km · Gangneung 44 km · Jumunjin 59 km · Neietsu 68 km · Pyeongchang 69 km · Yeongju 84 km · Sokcho 99 km

South Korea travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
220 V · 60 Hz
Prices
≈ 57% of US
price level, 2025
GDP per capita
$36,227
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.5
per 100k, 2023
Road deaths
8.6
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 522
Religion
none 60%Protestant 17%Buddhist 16%Catholic 6%

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 Santyoku (37.4406°, 129.1708°, elevation 23 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).