Yên Bái weather in December

In December, Yên Bái sees average daytime highs of 21°C and overnight lows near 16°C, with 42 mm of rain across 7.9 wet days and about 10.7 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 20°C by the end. The sky is clear or mostly clear about 24% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 48 min at the start of December to 10 h 42 min by month's end. Set against the rest of the year, December is Yên Bái's 3rd-clearest and 8th-windiest month. For the whole year in context, see Yên Bái's year-round climate.

Daytime high
21°
11th warmest
Overnight low
16°
3rd coldest
Rainfall
42 mm
7.9 wet days
Daylight
10 h 42 min
6:36 AM – 5:17 PM
Cloud cover
63%
3rd clearest
Wind
4 km/h
8th windiest
Solar energy
2.56 kWh/m²
Travel score
6.7
out of 10

Yên Bái is provincial city in Yên Bái province, Vietnam.

Density
942/km²
people per km²

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 20°C by the end.

A typical December day in Yên Bái reaches about 21°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 25°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)
12317
22317
32317
42217
52217
62217
72216
82216
92216
102216
112216
122116
132116
142116
152115
162115
172115
182115
192115
202115
212115
222115
232115
242115
252115
262115
272015
282015
292015
302015
312015

How December really feels in Yên Bái

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.

Yên Bái weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 14°438.910.86.1
Feb21° / 16°337.311.36.5
Mar24° / 18°7010.511.86.4
Apr29° / 22°12613.112.55.1
May31° / 25°29420133.3
Jun32° / 26°39823.213.32.4
Jul32° / 26°40725.613.22.3
Aug32° / 26°4152512.72.5
Sep31° / 25°22919.612.13.3
Oct29° / 23°11512.511.55.4
Nov25° / 19°648117.0
Dec21° / 16°427.910.76.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 17% of December, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24357
34357
44258
54258
64159
74060
84060
94060
104060
114060
124159
134258
144258
154357
164456
174456
184555
194555
204555
214456
224555
234555
244555
254456
264258
274159
283961
293862
303664
313565

Chance of precipitation in December

Any precipitation

Yên Bái gets around 42 mm of rain over 7.9 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 26% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
129
229
329
429
529
629
728
828
928
1027
1127
1226
1325
1425
1525
1624
1724
1824
1923
2023
2123
2223
2323
2423
2524
2624
2724
2825
2926
3026
3127

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 12% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1152434224
2162534214
3172634203
4182733183
5192833173
6202933162
7222932152
8233031142
9243031132
10263130121
11273129121
12293029111
13303028111
14323027101
15332927101
16352926100
17362826100
1837282690
1938272690
2039272680
2140272680
2240262670
2341262770
2441262760
2541262760
2641262860
2740262950
2840262950
2939262950
3039253060
3139253060

Wind in December

Winds average 4 km/h in December.

Across December, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 48 min at the start of December to 10 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 6:27 AM to 6:43 AM, and sunset from 5:13 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.86:275:13
210.86:285:13
310.86:285:13
410.76:295:14
510.76:305:14
610.76:305:14
710.76:315:14
810.76:315:14
910.76:325:15
1010.76:335:15
1110.76:335:15
1210.76:345:16
1310.76:345:16
1410.76:355:16
1510.76:365:17
1610.76:365:17
1710.76:375:17
1810.76:375:18
1910.76:385:18
2010.76:385:19
2110.76:395:19
2210.76:395:20
2310.76:405:20
2410.76:405:21
2510.76:405:21
2610.76:415:22
2710.76:415:22
2810.76:425:23
2910.76:425:23
3010.76:425:24
3110.76:435:24

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.56 kWh/m².

For context, solar energy here swings from a low near 2.19 kWh/m² to a high of 4.62 kWh/m² in June across the year — December's 2.56 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.6Moderate
22.6Moderate
32.6Moderate
42.6Moderate
52.5Moderate
62.5Moderate
72.5Moderate
82.5Moderate
92.5Moderate
102.5Moderate
112.5Moderate
122.5Moderate
132.5Moderate
142.5Moderate
152.6Moderate
162.6Moderate
172.6Moderate
182.6Moderate
192.6Moderate
202.6Moderate
212.6Moderate
222.6Moderate
232.6Moderate
242.6Moderate
252.6Moderate
262.5Moderate
272.5Moderate
282.5Moderate
292.5Moderate
302.4Moderate
312.4Moderate
Planning a trip in December

Hazard calendar for Yên Bái

In seasonPeak

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

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

Yên Bái's monsoon runs May–September, 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 Yên Bái?

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

6.7
Sightseeing
2nd-best month of the year
4.3
Beach & pool
7th-best month of the year

December is a reasonable time to visit Yên Bái for sightseeing.

What to pack for Yên Bái in December

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

In December, Yên Bái sees daytime highs around 21°C and nights near 16°C. Little to plan around — just the basics. About 8 days see rain.

UV index in Yên Bái 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 Yên Bái peaks around June 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 19 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highVery highExtremeVery highHighJun 22UV 13Nov 19UV 5
UV index (midday)Level
Jan6High
Feb7High
Mar10Very high
Apr6High
May8Very high
Jun13Extreme
Jul12Extreme
Aug11Extreme
Sep8Very high
Oct7High
Nov5High
Dec6High

Air quality in Yên Bái 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 Yên Bái is worst in December — around 83 µg/m³ PM2.5 (unhealthy), about 2.9× the cleanest month (July, 29 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyDec 2383 µg/m³Jul 2029 µg/m³
PM2.5 (µg/m³)Level
Jan83Unhealthy
Feb78Unhealthy
Mar78Unhealthy
Apr72Unhealthy
May50Poor
Jun36Poor
Jul29Moderate
Aug32Moderate
Sep42Poor
Oct57Unhealthy
Nov73Unhealthy
Dec83Unhealthy
Location & terrain

Where is Yên Bái?

Yên Bái sits at 21.7°N, 104.9°E, 45 m above sea level, in Vietnam. The nearest listed city is Tuyên Quang, 33 km away.

Topography around Yên Bái

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

Within 3 km, the terrain around Yên Bái has only modest variations in elevation — a maximum elevation change of 126 m around an average of 63 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 707 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,934 m.

The land around Yên Bái is covered by trees (79%) within 3 km, trees (80%) within 16 km, and trees (86%) within 80 km.

3 km
126 m
16 km
707 m
80 km
2,934 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Tuyên Quang 33 km · Nghĩa Lộ 43 km · Phú Thọ 48 km · Việt Trì 68 km · Cổ Đô 68 km · Thị Trấn Đại Từ 76 km · Thị Trấn Việt Quang 78 km · Bắc Quang 85 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 Yên Bái (21.7229°, 104.9113°, elevation 45 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). 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).