December weather forecast
Chiang Mai, Thailand

December, the last month of the year, is cool and dry in Chiang Mai. The temperatures drop notably from November, offering a refreshing climax to the year. It experiences the lowest rainfall in the year, only 16mm (0.63") over one day, making it the most appealing time to enjoy outdoor activities. The UV index at this point is moderate, making it an ideal month for sunbathing. In essence, December carries forward the pleasant weather of November, making Chiang Mai a tourist's paradise.

Temperature

With average high temperatures of 28.6°C (83.5°F) and lows of 15.7°C (60.3°F), December is the coldest month in Chiang Mai.

Heat index

December's heat index is evaluated at a tropical 32°C (89.6°F). If one stays active during extended exposure, it might induce fatigue and result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.

Humidity

In Chiang Mai, the average relative humidity in December is 73%.

Rainfall

In Chiang Mai, in December, it is raining for 1 days, with typically 16mm (0.63") of accumulated precipitation. In Chiang Mai, during the entire year, the rain falls for 113 days and collects up to 1131mm (44.53") of precipitation.

Daylight

The month with the shortest days is December, with an average of 11h and 0min of daylight.
On the first day of the month, sunrise is at 06:40 and sunset at 17:45. On the last day of December, sunrise is at 06:56 and sunset at 17:57 +07.

Sunshine

In December, the average sunshine is 8.5h.

UV index

With an average maximum UV index of 8, December is the month with the lowest UV index. A UV Index of 8 to 10 symbolizes a very high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum UV index, 8 during December, leads to the following recommendations:
Always stay safe. Unprotected skin and eyes can get damaged rapidly. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.