December weather forecast
Cilegon, Indonesia

The first month of the summer, December, is also a hot month in Cilegon, Indonesia, with an average temperature varying between 24.6°C (76.3°F) and 30.4°C (86.7°F).

Temperature

As Cilegon steps into December, the average high-temperature holds at a still hot 30.4°C (86.7°F), hinting at a minor fluctuation from the prior month. The nighttime temperature, during December, averages of 24.6°C (76.3°F).

Heat index

December's mean heat index is appraised at a fiery hot 38°C (100.4°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

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

Rainfall

In Cilegon, in December, it is raining for 27.5 days, with typically 156mm (6.14") of accumulated precipitation. Throughout the year, there are 292.5 rainfall days, and 1468mm (57.8") of precipitation is accumulated.

Daylight

December has the longest days of the year, with an average of 12h and 30min of daylight.
On the first day of December, sunrise is at 05:31 and sunset at 17:58. On the last day of the month, sunrise is at 05:45 and sunset at 18:13 WIB.

Sunshine

December has the most sunshine of the year, with an average of 9.2h of sunshine.

UV index

February through December, with an average maximum UV index of 7, are months with the highest 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 ordinary individuals.
Note: A maximum UV index of 7 in December translates into the following recommendations:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Employ a wide-brim hat for potent defense against up to 50% of UV rays.