Ít Ong weather in December

In December, Ít Ong sees average daytime highs of 21°C and overnight lows near 12°C, with 23 mm of rain across 3.5 wet days and about 10.7 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 46% 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 Ít Ong's 4th-clearest and 5th-windiest month. For the whole year in context, see Ít Ong's year-round climate.

Daytime high
21°
11th warmest
Overnight low
12°
2nd coldest
Rainfall
23 mm
3.5 wet days
Daylight
10 h 42 min
6:39 AM – 5:21 PM
Cloud cover
46%
4th clearest
Wind
5 km/h
5th windiest
Solar energy
3.12 kWh/m²
Travel score
7.7
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 21°C through the month.

A typical December day in Ít Ong reaches about 21°C in the afternoon and slips back to 12°C overnight — a 9°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 3°C cooler than November and on par with January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12214
22214
32214
42214
52214
62213
72213
82113
92113
102113
112113
122113
132113
142112
152112
162112
172112
182112
192112
202112
212112
222112
232112
242112
252112
262112
272112
282112
292112
302112
312112

Ít Ong 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° / 12°263.810.87.4
Feb23° / 13°163.211.38.1
Mar26° / 16°26511.87.8
Apr28° / 19°35812.56.3
May29° / 21°10916.5134.5
Jun28° / 22°24423.813.33.6
Jul28° / 22°39725.613.23.8
Aug28° / 22°42826.212.73.7
Sep28° / 21°23520.812.14.5
Oct26° / 19°619.411.56.7
Nov24° / 16°283.7118.1
Dec21° / 12°233.510.77.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 38%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
25842
35743
45743
55644
65644
75644
85644
95644
105644
115743
125842
135941
146040
156238
166337
176436
186535
196634
206733
216733
226832
236832
246832
256733
266733
276634
286634
296535
306436
316436

Chance of precipitation in December

Any precipitation

Ít Ong gets around 23 mm of rain over 3.5 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 11% and peaks near 16% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
115
216
316
416
516
615
715
814
914
1013
1112
1211
1311
1410
159
168
178
187
197
207
218
228
238
248
259
269
2710
2810
2911
3011
3112

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 62% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14042161
24242151
34441131
44641121
54740111
64939101
7523891
8543781
9563671
10583561
11593461
12613351
13623251
14653041
15662941
16662941
17672841
18682741
19702631
20702631
21712630
22722530
23722530
24732520
25722620
26722620
27722620
28722620
29712720
30712720
31712720

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

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 6:30 AM to 6:46 AM, and sunset from 5:17 PM to 5:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.86:305:17
210.86:315:17
310.86:315:17
410.86:325:18
510.86:335:18
610.76:335:18
710.76:345:18
810.76:355:18
910.76:355:19
1010.76:365:19
1110.76:365:19
1210.76:375:20
1310.76:385:20
1410.76:385:20
1510.76:395:21
1610.76:395:21
1710.76:405:21
1810.76:405:22
1910.76:415:22
2010.76:415:23
2110.76:425:23
2210.76:425:23
2310.76:435:24
2410.76:435:24
2510.76:445:25
2610.76:445:25
2710.76:445:26
2810.76:455:27
2910.76:455:27
3010.76:465:28
3110.76:465:28

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.12 kWh/m².

For context, solar energy here swings from a low near 3.04 kWh/m² to a high of 5.19 kWh/m² in April across the year — December's 3.12 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.1Moderate
23.1Moderate
33.1Moderate
43.1Moderate
53.0Moderate
63.0Moderate
73.0Moderate
83.0Moderate
93.0Moderate
103.1Moderate
113.1Moderate
123.1Moderate
133.1Moderate
143.1Moderate
153.1Moderate
163.2Moderate
173.2Moderate
183.2Moderate
193.2Moderate
203.2Moderate
213.2Moderate
223.2Moderate
233.2Moderate
243.2Moderate
253.2Moderate
263.2Moderate
273.2Moderate
283.2Moderate
293.2Moderate
303.1Moderate
313.1Moderate
Planning a trip in December

Hazard calendar for Ít Ong

In seasonPeak

None of Ít Ong's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Ít Ong's monsoon runs June–September, when most of the year's rain falls.

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

Is December a good time to visit Ít Ong?

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

7.7
Sightseeing
4th-best month of the year
4.7
Beach & pool
8th-best month of the year

December is one of the better times to visit Ít Ong for general sightseeing.

What to pack for Ít Ong in December

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

In December, Ít Ong sees daytime highs around 21°C and nights near 12°C. Little to plan around — just the basics. About 4 days see rain.

UV index in Ít Ong 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 Ít Ong peaks around June 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeExtremeVery highHighJun 20UV 14Dec 19UV 6
UV index (midday)Level
Jan7High
Feb9Very high
Mar12Extreme
Apr10Very high
May11Extreme
Jun14Extreme
Jul13Extreme
Aug13Extreme
Sep9Very high
Oct9Very high
Nov8Very high
Dec6High

Air quality in Ít Ong 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 Ít Ong is worst in April — around 70 µg/m³ PM2.5 (unhealthy), about 4.5× the cleanest month (July, 16 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyModeratePoorApr 1169 µg/m³Jul 2016 µg/m³
PM2.5 (µg/m³)Level
Jan43Poor
Feb48Poor
Mar64Unhealthy
Apr70Unhealthy
May34Moderate
Jun18Moderate
Jul16Moderate
Aug17Moderate
Sep23Moderate
Oct30Moderate
Nov37Poor
Dec42Poor
Location & terrain

Where is Ít Ong?

Ít Ong sits at 21.5°N, 104.0°E, 206 m above sea level, in Vietnam. The nearest listed city is Sơn La, 24 km away.

SapaYên BáiDien Bien PhuMường Lay

Topography around Ít Ong

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

Within 3 km, the terrain around Ít Ong has large variations in elevation — a maximum elevation change of 913 m around an average of 362 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,314 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,884 m.

The land around Ít Ong is covered by trees (52%) and grassland (33%) within 3 km, trees (64%) and grassland (27%) within 16 km, and trees (72%) and grassland (23%) within 80 km.

3 km
913 m
16 km
2,314 m
80 km
2,884 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Sơn La 24 km · Thị Trấn Thuận Châu 36 km · Nghĩa Lộ 51 km · Thị Trấn Phố Lu 91 km · Sapa 93 km · Yên Bái 94 km · Dien Bien Phu 105 km · Mường Lay 107 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 Ít Ong (21.5175°, 104.027°, elevation 206 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. 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).