Climate averages 1991–2020
Chiang Mai weather
in December.
A warm, very dry month: the coolest and the 3rd 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 Chiang Mai: daytime highs average 27.1°C and nights cool to about 16.0°C. By daytime temperature it is the coolest month of the year.
Expect about 9.1 mm of rain on roughly 1 day, which makes December a very dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 01 min on an average December day.
The nearest other city in this atlas is Lampang (77 km away). In December its highs average 27.8°C, 0.7°C warmer than Chiang Mai, with 12 mm of rain.
Among the 46 cities listed in Thailand, Chiang Mai ranks 45th of 46 for the warmest December highs and 12th of 46 for the driest December (rainfall, lowest first). The mean December high of those 46 cities is 29.6°C; Chiang Mai is 2.5°C cooler than that mean.
From December to January, average highs rise by 1.0°C to 28.1°C, and monthly rainfall falls from 9.1 mm to 6.7 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
Chiang Mai climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.1°C16.2°C | 16.2°C | 6.7 | 1.3 | 11.111 h |
| February | 31.3°C18.4°C | 18.4°C | 3.3 | 0.7 | 11.512 h |
| March | 34.3°C21.7°C | 21.7°C | 12 | 2.1 | 12.012 h |
| April | 35.8°C24.5°C | 24.5°C | 26 | 4.3 | 12.613 h |
| May | 33.1°C24.6°C | 24.6°C | 99 | 13.1 | 13.013 h |
| June | 30.9°C24.1°C | 24.1°C | 120 | 18.3 | 13.213 h |
| July | 29.9°C23.8°C | 23.8°C | 175 | 21.9 | 13.113 h |
| August | 29.1°C23.4°C | 23.4°C | 236 | 25.0 | 12.813 h |
| September | 29.3°C22.9°C | 22.9°C | 227 | 23.4 | 12.312 h |
| October | 28.9°C21.5°C | 21.5°C | 114 | 15.7 | 11.712 h |
| November | 28.3°C18.8°C | 18.8°C | 21 | 4.0 | 11.311 h |
| December, selected | 27.1°C16.0°C | 16.0°C | 9.1 | 1.2 | 11.011 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
- Lampang in DecemberThailand · 77 kmHigh 27.8°C · Low 17.6°C · 12 mm rain
- Chiang Rai in DecemberThailand · 153 kmHigh 25.5°C · Low 15.4°C · 27 mm rain
- Nyaunglebin in DecemberMyanmar · 256 kmHigh 29.4°C · Low 17.5°C · 5.2 mm rain
- Taungoo in DecemberMyanmar · 269 kmHigh 29.0°C · Low 17.1°C · 5.1 mm rain
- Thaton in DecemberMyanmar · 269 kmHigh 30.6°C · Low 20.4°C · 7.8 mm rain
- Mawlamyine in DecemberMyanmar · 293 kmHigh 30.4°C · Low 20.9°C · 8.7 mm rain
- Yawnghwe in DecemberMyanmar · 299 kmHigh 24.0°C · Low 14.0°C · 11 mm rain
- Taunggyi in DecemberMyanmar · 301 kmHigh 20.8°C · Low 10.3°C · 11 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 Chiang Mai) is explained once on the Chiang Mai year overview and on the Sources, method and limits page.