December weather forecast
Ko Lanta, Thailand

December marks the formal conclusion of the rainy season in Ko Lanta, a trend that began in November. The temperatures are comfortably warm, with considerably less rain and a decline in relative humidity, signalling the impending arrival of the dry season. It is a favourable time for outdoor activities with longer periods of sunshine and lower chances of precipitation. Transitioning into January, the weather becomes slightly cooler with slight fluctuations in temperature and daylight hours, preparing Ko Lanta for the new year’s climate cycle.

Temperature

The shift into December reveals an average high-temperature of a still tropical 31.2°C (88.2°F), closely mirroring November's climate. Ko Lanta, in December, experiences an average temperature of 23.6°C (74.5°F) at night.

Heat index

For December, the heat index is evaluated at a blistering 41°C (105.8°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are of high significance for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in December in Ko Lanta is 79%.

Rainfall

In Ko Lanta, Thailand, in December, it is raining for 6 days, with typically 56mm (2.2") of accumulated precipitation. Throughout the year, there are 155 rainfall days, and 2174mm (85.59") of precipitation is accumulated.

Daylight

The month with the shortest days is December, with an average of 11h and 42min of daylight.
On the first day of December in Ko Lanta, Thailand, sunrise is at 06:21 and sunset at 18:04. On the last day of the month, sunrise is at 06:36 and sunset at 18:17 +07.