December weather forecast
Mariveles, Philippines

The first month of the winter, December, is also a moderately hot month in Mariveles, Philippines, with an average temperature ranging between min 25°C (77°F) and max 29.4°C (84.9°F).

Temperature

A minimal variation is noted in Mariveles's average high-temperature at the onset of December, reaching a warm 29.4°C (84.9°F) from November's 30.1°C (86.2°F). Mariveles nights in December witness a mild cool down to an average temperature of 25°C (77°F).

Heat index

In December, the average heat index is estimated at a very hot 35°C (95°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In Mariveles, the average relative humidity in December is 77%.

Rainfall

In Mariveles, in December, it is raining for 13.1 days, with typically 69mm (2.72") of accumulated precipitation. Throughout the year, there are 206.5 rainfall days, and 1288mm (50.71") of precipitation is accumulated.

Sea temperature

In Mariveles, the average seawater temperature in December is 28.2°C (82.8°F).
Note: Water surface temperatures from 25°C (77°F) to 29°C (84.2°F) are considered optimal and extremely delightful for long-lasting pleasure in any water activity.

Daylight

The month with the shortest days is December, with an average of 11h and 18min of daylight.
On the first day of the month, sunrise is at 6:07 am and sunset at 5:27 pm. On the last day of December, sunrise is at 6:22 am and sunset at 5:39 pm PST.

Sunshine

In Mariveles, the average sunshine in December is 6.2h.

UV index

The months with the highest UV index are January through June, August through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: In December, a daily maximum UV index of 7 leads to the following instructions:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.