Climate averages 1991–2020
Vientiane weather
in December.
A warm, very dry month: the coolest and the driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Vientiane: daytime highs average 26.9°C and nights cool to about 17.3°C. By daytime temperature it is the coolest month of the year.
Expect about 8.4 mm of rain on roughly 1 day, which makes December a very dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 11 h 04 min on an average December day.
The nearest other city in this atlas is Udon Thani (64 km away). In December its highs average 27.4°C, about as warm as Vientiane, with 6.4 mm of rain.
Among the 4 cities listed in Laos, Vientiane ranks 4th of 4 for the warmest December highs and 4th of 4 for the driest December (rainfall, lowest first). The mean December high of those 4 cities is 28.0°C; Vientiane is 1.0°C cooler than that mean.
From December to January, average highs rise by 0.4°C to 27.3°C, and monthly rainfall rises from 8.4 mm to 11 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Vientiane climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.3°C17.0°C | 17.0°C | 11 | 1.8 | 11.211 h |
| February | 29.8°C18.9°C | 18.9°C | 15 | 2.2 | 11.512 h |
| March | 32.6°C22.1°C | 22.1°C | 36 | 6.2 | 12.012 h |
| April | 33.8°C24.4°C | 24.4°C | 75 | 11.9 | 12.513 h |
| May | 31.9°C24.7°C | 24.7°C | 261 | 23.4 | 13.013 h |
| June | 30.5°C24.7°C | 24.7°C | 316 | 25.0 | 13.213 h |
| July | 29.9°C24.4°C | 24.4°C | 372 | 26.5 | 13.113 h |
| August | 29.6°C24.1°C | 24.1°C | 401 | 27.4 | 12.713 h |
| September | 29.6°C23.8°C | 23.8°C | 300 | 24.7 | 12.312 h |
| October | 29.3°C22.7°C | 22.7°C | 101 | 11.9 | 11.712 h |
| November | 28.7°C20.2°C | 20.2°C | 22 | 3.0 | 11.311 h |
| December, selected | 26.9°C17.3°C | 17.3°C | 8.4 | 1.2 | 11.111 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Udon Thani in DecemberThailand · 64 kmHigh 27.4°C · Low 17.3°C · 6.4 mm rain
- Khon Kaen in DecemberThailand · 171 kmHigh 28.3°C · Low 18.3°C · 5.1 mm rain
- Sakon Nakhon in DecemberThailand · 187 kmHigh 27.6°C · Low 17.2°C · 5.5 mm rain
- Thakhèk in DecemberLaos · 244 kmHigh 27.7°C · Low 16.3°C · 5.8 mm rain
- Savannakhet in DecemberLaos · 277 kmHigh 27.7°C · Low 17.8°C · 4.9 mm rain
- Lampang in DecemberThailand · 330 kmHigh 27.8°C · Low 17.6°C · 12 mm rain
- Vinh in DecemberVietnam · 336 kmHigh 21.2°C · Low 16.9°C · 47 mm rain
- Nakhon Ratchasima in DecemberThailand · 337 kmHigh 28.9°C · Low 19.1°C · 5.3 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Vientiane) is explained once on the Vientiane year overview and on the Sources, method and limits page.