Vieng Xai weather in December
In December, Vieng Xai sees average daytime highs of 20°C and overnight lows near 11°C, with 19 mm of rain across 4.2 wet days and about 10.8 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.
Day-to-day highs hold fairly steady near 20°C through the month. The sky is clear or mostly clear about 34% 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 Vieng Xai's 4th-clearest and 7th-windiest month. For the whole year in context, see Vieng Xai's year-round climate.
- Daytime high
- 20°
- 12th warmest
- Overnight low
- 11°
- 2nd coldest
- Rainfall
- 19 mm
- 4.2 wet days
- Daylight
- 10 h 48 min
- 6:36 AM – 5:22 PM
- Cloud cover
- 58%
- 4th clearest
- Wind
- 5 km/h
- 7th windiest
- Solar energy
- 3.16 kWh/m²
- Travel score
- 7.1
- out of 10
Temperature in December
Day-to-day highs hold fairly steady near 20°C through the month.
A typical December day in Vieng Xai reaches about 20°C in the afternoon and slips back to 11°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 25°C. Set against its neighbours, December runs about 3°C cooler than November and on par with January.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 |
| Avg low (°C) | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 11 | 11 | 11 | 11 | 11 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 21 | 13 |
| 2 | 21 | 13 |
| 3 | 21 | 13 |
| 4 | 21 | 12 |
| 5 | 20 | 12 |
| 6 | 20 | 12 |
| 7 | 20 | 12 |
| 8 | 20 | 12 |
| 9 | 20 | 12 |
| 10 | 20 | 12 |
| 11 | 20 | 11 |
| 12 | 20 | 11 |
| 13 | 20 | 11 |
| 14 | 20 | 11 |
| 15 | 20 | 11 |
| 16 | 19 | 11 |
| 17 | 19 | 11 |
| 18 | 19 | 11 |
| 19 | 19 | 11 |
| 20 | 19 | 11 |
| 21 | 19 | 11 |
| 22 | 19 | 11 |
| 23 | 19 | 11 |
| 24 | 19 | 11 |
| 25 | 19 | 10 |
| 26 | 19 | 10 |
| 27 | 19 | 11 |
| 28 | 19 | 11 |
| 29 | 19 | 11 |
| 30 | 19 | 11 |
| 31 | 20 | 11 |
How December really feels in Vieng Xai
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.
December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Vieng Xai weather by month
How December compares with the rest of the year at a glance. December is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 20° / 11° | 22 | 4.4 | 10.9 | 7.0 |
| Feb | 22° / 12° | 14 | 3.8 | 11.3 | 7.6 |
| Mar | 25° / 15° | 60 | 10.6 | 11.9 | 6.8 |
| Apr | 28° / 18° | 109 | 17.7 | 12.5 | 5.1 |
| May | 29° / 20° | 205 | 23.2 | 13 | 3.7 |
| Jun | 29° / 22° | 201 | 24.2 | 13.2 | 3.2 |
| Jul | 29° / 22° | 264 | 26.2 | 13.1 | 3.3 |
| Aug | 28° / 21° | 302 | 26.8 | 12.7 | 3.6 |
| Sep | 27° / 20° | 193 | 20.1 | 12.1 | 4.7 |
| Oct | 25° / 18° | 91 | 14.2 | 11.5 | 6.1 |
| Nov | 23° / 15° | 32 | 6.3 | 11 | 7.3 |
| Dec | 20° / 11° | 19 | 4.2 | 10.8 | 7.1 |
Cloud cover in December
The sky is clear or mostly clear about 34% 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 53%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 46 | 44 | 44 | 43 | 42 | 41 | 42 | 41 | 42 | 42 | 43 | 44 | 44 | 46 | 47 | 49 | 50 | 50 | 51 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 51 | 51 | 50 | 49 | 48 |
| Cloudier (%) | 54 | 56 | 56 | 57 | 58 | 59 | 58 | 59 | 58 | 58 | 57 | 56 | 56 | 54 | 53 | 51 | 50 | 50 | 49 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 49 | 49 | 50 | 51 | 52 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 46 | 54 |
| 2 | 44 | 56 |
| 3 | 44 | 56 |
| 4 | 43 | 57 |
| 5 | 42 | 58 |
| 6 | 41 | 59 |
| 7 | 42 | 58 |
| 8 | 41 | 59 |
| 9 | 42 | 58 |
| 10 | 42 | 58 |
| 11 | 43 | 57 |
| 12 | 44 | 56 |
| 13 | 44 | 56 |
| 14 | 46 | 54 |
| 15 | 47 | 53 |
| 16 | 49 | 51 |
| 17 | 50 | 50 |
| 18 | 50 | 50 |
| 19 | 51 | 49 |
| 20 | 52 | 48 |
| 21 | 52 | 48 |
| 22 | 52 | 48 |
| 23 | 52 | 48 |
| 24 | 52 | 48 |
| 25 | 52 | 48 |
| 26 | 52 | 48 |
| 27 | 51 | 49 |
| 28 | 51 | 49 |
| 29 | 50 | 50 |
| 30 | 49 | 51 |
| 31 | 48 | 52 |
Chance of precipitation in December
Vieng Xai gets around 19 mm of rain over 4.2 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 13% and peaks near 17% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 15 | 15 | 14 | 13 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 13 | 13 |
| Rain chance (%) | |
|---|---|
| 1 | 17 |
| 2 | 17 |
| 3 | 17 |
| 4 | 17 |
| 5 | 17 |
| 6 | 17 |
| 7 | 17 |
| 8 | 16 |
| 9 | 16 |
| 10 | 15 |
| 11 | 15 |
| 12 | 14 |
| 13 | 13 |
| 14 | 12 |
| 15 | 12 |
| 16 | 11 |
| 17 | 11 |
| 18 | 11 |
| 19 | 11 |
| 20 | 11 |
| 21 | 11 |
| 22 | 11 |
| 23 | 11 |
| 24 | 11 |
| 25 | 11 |
| 26 | 11 |
| 27 | 12 |
| 28 | 12 |
| 29 | 12 |
| 30 | 13 |
| 31 | 13 |
Humidity in December
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 56% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 39 | 41 | 42 | 44 | 46 | 48 | 50 | 51 | 52 | 55 | 56 | 57 | 58 | 59 | 60 | 60 | 60 | 61 | 61 | 61 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 61 | 61 | 61 | 61 |
| Comfortable (%) | 34 | 34 | 34 | 33 | 33 | 33 | 32 | 32 | 32 | 31 | 31 | 31 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 31 | 31 | 32 | 32 | 32 | 33 | 33 | 33 | 33 |
| Humid (%) | 24 | 23 | 22 | 20 | 19 | 18 | 16 | 15 | 14 | 13 | 12 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Muggy (%) | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 39 | 34 | 24 | 3 |
| 2 | 41 | 34 | 23 | 2 |
| 3 | 42 | 34 | 22 | 2 |
| 4 | 44 | 33 | 20 | 2 |
| 5 | 46 | 33 | 19 | 2 |
| 6 | 48 | 33 | 18 | 2 |
| 7 | 50 | 32 | 16 | 2 |
| 8 | 51 | 32 | 15 | 2 |
| 9 | 52 | 32 | 14 | 2 |
| 10 | 55 | 31 | 13 | 1 |
| 11 | 56 | 31 | 12 | 1 |
| 12 | 57 | 31 | 11 | 1 |
| 13 | 58 | 30 | 11 | 1 |
| 14 | 59 | 30 | 10 | 1 |
| 15 | 60 | 29 | 10 | 1 |
| 16 | 60 | 29 | 10 | 1 |
| 17 | 60 | 29 | 10 | 1 |
| 18 | 61 | 29 | 9 | 1 |
| 19 | 61 | 29 | 9 | 1 |
| 20 | 61 | 29 | 9 | 1 |
| 21 | 62 | 30 | 8 | 0 |
| 22 | 62 | 30 | 8 | 0 |
| 23 | 62 | 31 | 7 | 0 |
| 24 | 62 | 31 | 7 | 0 |
| 25 | 62 | 32 | 6 | 0 |
| 26 | 62 | 32 | 6 | 0 |
| 27 | 62 | 32 | 6 | 0 |
| 28 | 61 | 33 | 6 | 0 |
| 29 | 61 | 33 | 6 | 0 |
| 30 | 61 | 33 | 6 | 0 |
| 31 | 61 | 33 | 6 | 0 |
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.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 5 | calm |
| 10 | 5 | calm |
| 11 | 5 | calm |
| 12 | 5 | calm |
| 13 | 5 | calm |
| 14 | 5 | calm |
| 15 | 5 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
| 31 | 5 | calm |
Sunrise & sunset in December
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 6:27 AM to 6:43 AM, and sunset from 5:18 PM to 5:30 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.9 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 |
| Sunrise (AM) | 6:27 | 6:28 | 6:29 | 6:29 | 6:30 | 6:30 | 6:31 | 6:32 | 6:32 | 6:33 | 6:33 | 6:34 | 6:35 | 6:35 | 6:36 | 6:36 | 6:37 | 6:37 | 6:38 | 6:38 | 6:39 | 6:39 | 6:40 | 6:40 | 6:41 | 6:41 | 6:41 | 6:42 | 6:42 | 6:43 | 6:43 |
| Sunset (PM) | 5:18 | 5:19 | 5:19 | 5:19 | 5:19 | 5:19 | 5:20 | 5:20 | 5:20 | 5:20 | 5:21 | 5:21 | 5:21 | 5:22 | 5:22 | 5:22 | 5:23 | 5:23 | 5:24 | 5:24 | 5:24 | 5:25 | 5:25 | 5:26 | 5:26 | 5:27 | 5:27 | 5:28 | 5:29 | 5:29 | 5:30 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 10.9 | 6:27 | 5:18 |
| 2 | 10.8 | 6:28 | 5:19 |
| 3 | 10.8 | 6:29 | 5:19 |
| 4 | 10.8 | 6:29 | 5:19 |
| 5 | 10.8 | 6:30 | 5:19 |
| 6 | 10.8 | 6:30 | 5:19 |
| 7 | 10.8 | 6:31 | 5:20 |
| 8 | 10.8 | 6:32 | 5:20 |
| 9 | 10.8 | 6:32 | 5:20 |
| 10 | 10.8 | 6:33 | 5:20 |
| 11 | 10.8 | 6:33 | 5:21 |
| 12 | 10.8 | 6:34 | 5:21 |
| 13 | 10.8 | 6:35 | 5:21 |
| 14 | 10.8 | 6:35 | 5:22 |
| 15 | 10.8 | 6:36 | 5:22 |
| 16 | 10.8 | 6:36 | 5:22 |
| 17 | 10.8 | 6:37 | 5:23 |
| 18 | 10.8 | 6:37 | 5:23 |
| 19 | 10.8 | 6:38 | 5:24 |
| 20 | 10.8 | 6:38 | 5:24 |
| 21 | 10.8 | 6:39 | 5:24 |
| 22 | 10.8 | 6:39 | 5:25 |
| 23 | 10.8 | 6:40 | 5:25 |
| 24 | 10.8 | 6:40 | 5:26 |
| 25 | 10.8 | 6:41 | 5:26 |
| 26 | 10.8 | 6:41 | 5:27 |
| 27 | 10.8 | 6:41 | 5:27 |
| 28 | 10.8 | 6:42 | 5:28 |
| 29 | 10.8 | 6:42 | 5:29 |
| 30 | 10.8 | 6:43 | 5:29 |
| 31 | 10.8 | 6:43 | 5:30 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 3.16 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 3.16 kWh/m² to a high of 5.2 kWh/m² in April across the year — December's 3.16 kWh/m² sits near the bottom.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.2 | 3.2 | 3.2 | 3.2 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 3.1 | Moderate |
| 2 | 3.1 | Moderate |
| 3 | 3.1 | Moderate |
| 4 | 3.1 | Moderate |
| 5 | 3.1 | Moderate |
| 6 | 3.1 | Moderate |
| 7 | 3.1 | Moderate |
| 8 | 3.1 | Moderate |
| 9 | 3.1 | Moderate |
| 10 | 3.1 | Moderate |
| 11 | 3.1 | Moderate |
| 12 | 3.1 | Moderate |
| 13 | 3.1 | Moderate |
| 14 | 3.2 | Moderate |
| 15 | 3.2 | Moderate |
| 16 | 3.2 | Moderate |
| 17 | 3.2 | Moderate |
| 18 | 3.3 | Moderate |
| 19 | 3.3 | Moderate |
| 20 | 3.3 | Moderate |
| 21 | 3.3 | Moderate |
| 22 | 3.3 | Moderate |
| 23 | 3.3 | Moderate |
| 24 | 3.3 | Moderate |
| 25 | 3.3 | Moderate |
| 26 | 3.3 | Moderate |
| 27 | 3.3 | Moderate |
| 28 | 3.3 | Moderate |
| 29 | 3.3 | Moderate |
| 30 | 3.3 | Moderate |
| 31 | 3.3 | Moderate |
Hazard calendar for Vieng Xai
None of Vieng Xai's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Vieng Xai's monsoon runs May–September, when most of the year's rain falls.
Is December a good time to visit Vieng Xai?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is one of the better times to visit Vieng Xai for general sightseeing.
What to pack for Vieng Xai in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Vieng Xai sees daytime highs around 20°C and nights near 11°C. Little to plan around — just the basics. About 4 days see rain.
UV index in Vieng Xai in December
Clear-sky midday UV in December peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Vieng Xai peaks around August 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 7 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 8 | 9 | 10 | 9 | 10 | 14 | 13 | 14 | 10 | 9 | 8 | 7 |
| Level | Very high | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 9 | Very high |
| Mar | 10 | Very high |
| Apr | 9 | Very high |
| May | 10 | Extreme |
| Jun | 14 | Extreme |
| Jul | 13 | Extreme |
| Aug | 14 | Extreme |
| Sep | 10 | Very high |
| Oct | 9 | Very high |
| Nov | 8 | Very high |
| Dec | 7 | High |
Air quality in Vieng Xai in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in Vieng Xai is worst in April — around 288 µg/m³ PM2.5 (very unhealthy), about 35.5× the cleanest month (August, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 20 | 28 | 98 | 288 | 64 | 14 | 9 | 8 | 11 | 15 | 15 | 19 |
| Level | Moderate | Moderate | Unhealthy | Very unhealthy | Unhealthy | Moderate | Good | Good | Good | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 20 | Moderate |
| Feb | 28 | Moderate |
| Mar | 98 | Unhealthy |
| Apr | 288 | Very unhealthy |
| May | 64 | Unhealthy |
| Jun | 14 | Moderate |
| Jul | 9 | Good |
| Aug | 8 | Good |
| Sep | 11 | Good |
| Oct | 15 | Moderate |
| Nov | 15 | Moderate |
| Dec | 19 | Moderate |
Where is Vieng Xai?
Vieng Xai sits at 20.4°N, 104.2°E, 0 m above sea level, in Laos. The nearest listed city is Xam Nua, 19 km away.
Topography around Vieng Xai
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Vieng Xai.
Within 3 km, the terrain around Vieng Xai has large variations in elevation — a maximum elevation change of 661 m around an average of 915 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,259 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,998 m.
The land around Vieng Xai is covered by trees (65%) and grassland (25%) within 3 km, trees (86%) within 16 km, and trees (82%) within 80 km.
Laos travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B / C / E / F
- 230 V · 50 Hz
- Prices
- ≈ 23% of US
- price level, 2025
- GDP per capita
- $2,325
- 2025
- Happiness
- 5.5 / 10
- World Happiness, 2025
- Safe drinking water
- 35%
- of population, 2024
- Road deaths
- 17.9
- per 100k/yr, 2019
- Income group
- Lower middle
- World Bank
- English
- Low
- EF EPI 461
- Religion
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 Vieng Xai (20.4068°, 104.2238°, elevation 0 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).