December weather forecastBiak, Indonesia

Weather in December

Coming to the close of the year, December presents an increase in rainfall to 170mm (6.69"), indicating the transition back to wetter months. Alongside, there's a mild decrease in sunshine hours; however, daylight remains consistent with the past months. The typical features of Biak's tropical climate, such as high humidity and stable temperatures, persist through December. Sea temperatures remain uniform, encouraging water-based activities. As December winds down, the trend of increasing rainfall and reduced sunshine indicates a return to the highly rainy months akin to the early part of the year.

Temperature

As Biak welcomes December, the average high-temperature is noted at a warm 29.7°C (85.5°F), closely aligning with the preceding month. Biak's nighttime temperature in December experiences a slight dip from daytime highs, falling to an average of 26.2°C (79.2°F).

Heat index

The heat index value during December is estimated at a very hot 36°C (96.8°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

The average relative humidity in December is 78%.

Rainfall

In December, the rain falls for 26.6 days. Throughout December, 170mm (6.69") of precipitation is accumulated. In Biak, during the entire year, the rain falls for 323.4 days and collects up to 2132mm (83.94") of precipitation.

Sea temperature

The months with the coldest seawater are January through October and December, with an average sea temperature of 29°C (84.2°F).
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for all water activities, offering enjoyment without causing discomfort over extended periods.

Daylight

With an average of 12h and 12min of daylight, December has the longest days of the year.
On the first day of December, sunrise is at 05:39 and sunset at 17:50. On the last day of the month, sunrise is at 05:53 and sunset at 18:04 WIT.

Sunshine

The average sunshine in December is 8h.

UV index

February and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the average person.
Note: A maximum daily UV index of 6 during December morphs into the following directions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Experience reduced UV exposure by about half when donning a wide-brim hat. Attention! UV radiation is markedly stronger with water and sand reflections.