Bỉm Sơn weather in December

In December, Bỉm Sơn sees average daytime highs of 22°C and overnight lows near 16°C, with 25 mm of rain across 5.4 wet days and about 10.8 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 21°C by the end. The sky is clear or mostly clear about 22% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 54 min at the start of December to 10 h 48 min by month's end. Set against the rest of the year, December is Bỉm Sơn's 3rd-clearest and 1st-windiest month. For the whole year in context, see Bỉm Sơn's year-round climate.

Daytime high
22°
10th warmest
Overnight low
16°
2nd coldest
Rainfall
25 mm
5.4 wet days
Daylight
10 h 48 min
6:29 AM – 5:16 PM
Cloud cover
67%
3rd clearest
Wind
9 km/h
1st windiest
Solar energy
2.7 kWh/m²
Travel score
7.1
out of 10

Bỉm Sơn is district-level town in Thanh Hóa province, Vietnam.

Density
802/km²
people per km²
Founded
1981

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 23°C in the first days to 21°C by the end.

A typical December day in Bỉm Sơn reaches about 22°C in the afternoon and slips back to 16°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 27°C. Set against its neighbours, December runs about 4°C cooler than November and about 2°C warmer than January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12418
22417
32317
42317
52317
62317
72317
82317
92316
102216
112216
122216
132216
142216
152216
162216
172216
182216
192215
202215
212215
222215
232215
242215
252115
262115
272115
282115
292115
302115
312115

How December really feels in Bỉm Sơn

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.

Bỉm Sơn 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 daysDaylight (hours)Travel score
Jan21° / 15°295.610.96.7
Feb22° / 16°174.411.37.0
Mar25° / 19°356.711.97.0
Apr29° / 22°648.612.45.5
May32° / 25°17815.512.93.3
Jun34° / 27°17814.613.22.5
Jul33° / 27°23417.813.12.5
Aug32° / 26°3242312.72.6
Sep31° / 25°27820.812.13.2
Oct29° / 23°15614.511.55.1
Nov26° / 19°577.9116.9
Dec22° / 16°255.410.87.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14060
23961
33961
43763
53763
63763
73664
83565
93565
103565
113466
123466
133565
143565
153664
163565
173565
183763
193763
203763
213862
223664
233664
243664
253565
263565
273565
283466
293367
303169
313070

Chance of precipitation in December

Any precipitation

Bỉm Sơn gets around 25 mm of rain over 5.4 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 18% and peaks near 24% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
124
223
323
422
522
621
721
820
919
1019
1118
1217
1317
1416
1516
1616
1715
1815
1915
2015
2116
2216
2316
2416
2516
2616
2717
2817
2918
3018
3119

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 35% of days. Sticky, muggy-or-worse air turns up on roughly 23% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
12221232113
22321232112
32421232111
42521232010
5262223209
6272222199
7292222198
8302222197
9312222186
10332221186
11342221185
12352221185
13362120185
14372120184
15382020174
16392020174
17401920174
18401920164
19401921164
20411921164
21411822154
22411822154
23411823153
24411823153
25401824153
26401924152
27391924162
28391924172
29381924172
30371924181
31371924191

Wind in December

Winds average 9 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 9 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
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 54 min at the start of December to 10 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 6:20 AM to 6:36 AM, and sunset from 5:12 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.96:205:12
210.96:215:13
310.96:215:13
410.86:225:13
510.86:235:13
610.86:235:13
710.86:245:14
810.86:245:14
910.86:255:14
1010.86:265:14
1110.86:265:15
1210.86:275:15
1310.86:275:15
1410.86:285:16
1510.86:285:16
1610.86:295:16
1710.86:305:17
1810.86:305:17
1910.86:315:18
2010.86:315:18
2110.86:325:19
2210.86:325:19
2310.86:325:20
2410.86:335:20
2510.86:335:21
2610.86:345:21
2710.86:345:22
2810.86:355:22
2910.86:355:23
3010.86:355:23
3110.86:365:24

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.7 kWh/m².

For context, solar energy here swings from a low near 2.43 kWh/m² to a high of 5.33 kWh/m² in June across the year — December's 2.7 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.8Moderate
22.8Moderate
32.8Moderate
42.8Moderate
52.8Moderate
62.7Moderate
72.7Moderate
82.7Moderate
92.7Moderate
102.7Moderate
112.7Moderate
122.7Moderate
132.7Moderate
142.7Moderate
152.7Moderate
162.7Moderate
172.7Moderate
182.7Moderate
192.7Moderate
202.7Moderate
212.7Moderate
222.7Moderate
232.7Moderate
242.7Moderate
252.7Moderate
262.7Moderate
272.7Moderate
282.6Moderate
292.6Moderate
302.6Moderate
312.6Moderate
Planning a trip in December

Hazard calendar for Bỉm Sơn

In seasonPeak

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

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

Bỉm Sơn's monsoon runs May–October, when most of the year's rain falls.

Pacific typhoon
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Bỉm Sơn?

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

7.1
Sightseeing
1st-best month of the year
5.1
Beach & pool
6th-best month of the year

December is one of the better times to visit Bỉm Sơn for general sightseeing.

What to pack for Bỉm Sơn in December

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

In December, Bỉm Sơn sees daytime highs around 22°C and nights near 16°C. Worth packing: light clothes. About 5 days see rain.

light clothes

Sea temperature near Bỉm Sơn in December

The nearest coast averages about 23°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 36 km away) is warmest in August at about 30°C and coldest in February near 20°C.

The water stays above 20°C all year — warm enough for a swim any month.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan21Refreshing
Feb20Refreshing
Mar21Refreshing
Apr24Refreshing
May28Warm
Jun29Tropical
Jul30Tropical
Aug30Tropical
Sep29Tropical
Oct28Warm
Nov26Warm
Dec23Refreshing

UV index in Bỉm Sơn in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bỉm Sơn peaks around July 14 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 6 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighJul 14UV 12Dec 15UV 6
UV index (midday)Level
Jan7Very high
Feb9Very high
Mar10Very high
Apr8Very high
May10Very high
Jun12Extreme
Jul12Extreme
Aug11Extreme
Sep9Very high
Oct9Very high
Nov7High
Dec6High

Air quality in Bỉm Sơn 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 Bỉm Sơn is worst in December — around 134 µg/m³ PM2.5 (unhealthy), about 3.8× the cleanest month (July, 35 µg/m³).

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

0306090120150JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyDec 20132 µg/m³Jul 1536 µg/m³
PM2.5 (µg/m³)Level
Jan126Unhealthy
Feb106Unhealthy
Mar94Unhealthy
Apr87Unhealthy
May60Unhealthy
Jun42Poor
Jul35Moderate
Aug46Poor
Sep69Unhealthy
Oct93Unhealthy
Nov116Unhealthy
Dec134Unhealthy
Location & terrain

Where is Bỉm Sơn?

Bỉm Sơn sits at 20.1°N, 105.9°E, 7 m above sea level, in Vietnam. The nearest listed city is Nga Sơn, 14 km away.

Topography around Bỉm Sơn

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

Within 3 km, the terrain around Bỉm Sơn has only modest variations in elevation — a maximum elevation change of 99 m around an average of 13 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 327 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,500 m.

The land around Bỉm Sơn is covered by trees (39%) and cropland (27%) within 3 km, trees (52%) and cropland (33%) within 16 km, and trees (41%), cropland (29%) and water (23%) within 80 km.

3 km
99 m
16 km
327 m
80 km
1,500 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Nga Sơn 14 km · Ninh Binh 24 km · Thanh Hóa 32 km · Sầm Sơn 39 km · Thị Trấn Lam Sơn 51 km · Nam Định 52 km · Phủ Lý 52 km · Thái Bình 65 km

Vietnam travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C / F
220 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,066
2025
Happiness
6.4 / 10
World Happiness, 2025
Safe drinking water
59%
of population, 2024
Homicide rate
1.5
per 100k, 2011
Road deaths
30.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 500
Religion
none 86%Catholic 6%Buddhist 6%Protestant 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 Bỉm Sơn (20.0781°, 105.8603°, elevation 7 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).