December weather forecastSiantan, Indonesia

Weather in December

The first month of the winter, December, is also a hot month in Siantan, Indonesia, with an average temperature fluctuating between 24.1°C (75.4°F) and 30.7°C (87.3°F).

Temperature

With the start of December, Siantan measures an average high-temperature of a still tropical 30.7°C (87.3°F), not significantly differing from November's 31.2°C (88.2°F). Siantan encounters an average low-temperature of 24.1°C (75.4°F) during December nights.

Heat index

December's heat index is calculated to be an extremely hot 41°C (105.8°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', binds temperature metrics with humidity values to give a sense of the actual warmth. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. 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 largely significant for babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In Siantan, the average relative humidity in December is 84%.

Rainfall

In Siantan, in December, during 25 rainfall days, 147mm (5.79") of precipitation is typically accumulated. In Siantan, during the entire year, the rain falls for 282.2 days and collects up to 1495mm (58.86") of precipitation.

Daylight

The average length of the day in December is 12h and 7min.
On the first day of December, sunrise is at 05:28 and sunset at 17:35. On the last day of the month, sunrise is at 05:42 and sunset at 17:49 WIB.

Sunshine

With an average of 7h of sunshine, December has the least sunshine of the year.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum high daily UV index of 7 during December translates into the following directions:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Employ a wide-brim hat for potent defense against up to 50% of UV rays.