The first month of the winter, December
, is still a tropical month in Puerto Princesa
, with an average temperature ranging between min 23.3°C (73.9°F) and max 30.7°C (87.3°F).
The coldest months are January
and December, with an average high-temperature of 30.7°C (87.3°F).
The average heat index in December is computed to be a blistering 42°C (107.6°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.Note
: The heat index, also known as 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like pregnancy, clothing, metabolic differences, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.
In December, the average relative humidity in Puerto Princesa is 86%.
In Puerto Princesa, in December, during 9 rainfall days, 137.4mm (5.41") of precipitation is typically accumulated. In Puerto Princesa, during the entire year, the rain falls for 130 days and collects up to 1563.8mm (61.57") of precipitation.
In Puerto Princesa, the average seawater temperature in December is 28.8°C (83.8°F).Note
: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.
December has the shortest days of the year, with an average of 11h and 34min of daylight.
On the first day of December, sunrise is at 6:06 am and sunset at 5:41 pm. On the last day of the month, sunrise is at 6:21 am and sunset at 5:54 pm PST.
In December, the average sunshine is 7h.
With an average maximum UV index of 10, December is the month with the lowest UV index in Puerto Princesa. A UV Index reading of 8 to 10 represents a very high health vulnerability from exposure to the Sun's UV rays for average individuals.Note
: The average daily UV index of 10 in December transform into the following instructions:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.