December weather forecast
Isulan, Philippines

The first month of the winter, December, is still a tropical month in Isulan, Philippines, with temperature in the range of an average low of 20.9°C (69.6°F) and an average high of 30.9°C (87.6°F).

Temperature

December's arrival shows an average high-temperature of a still tropical 30.9°C (87.6°F), hardly different from the previous month. Throughout the nights in December, an average low-temperature of 20.9°C (69.6°F) is noted in Isulan.

Heat index

The heat index value during December is computed to be an extremely hot 41°C (105.8°F). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
One should consider that heat index numbers are for shaded settings and light wind. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', quantifies the warmth felt when relative humidity is considered. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

The average relative humidity in December in Isulan is 81%.

Rainfall

In December, in Isulan, Philippines, the rain falls for 22.7 days. Throughout December, 96mm (3.78") of precipitation is accumulated. Throughout the year, there are 306.7 rainfall days, and 1786mm (70.31") 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, sunrise is at 5:37 am and sunset at 5:23 pm. On the last day of the month, sunrise is at 5:52 am and sunset at 5:37 pm PST.

Sunshine

The months with the most sunshine in Isulan are March, April, July and December, with an average of 8.8h of sunshine.

UV index

January, February, June through December, with an average maximum UV index of 6, are months with the lowest UV index in Isulan, Philippines. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the maximum UV index of 6 suggests this advice:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.