December weather forecast
Kupang, Indonesia

December sees Kupang fully embracing its annual monsoon. The showers pick up momentum, and the humidity resurfaces on meter readings, reflecting a complete reversal from the summer spell. After a long wait, the onset of December unlocks the full bounty of the rainy season. It culminates in a substantial increase in rainfall from the November average, registering a notable 140mm (5.51"). Hence, December's weather completes the yearly cycle by restoring Kupang to its humid and rainy self.

Temperature

The arrival of December in Kupang brings an average high-temperature of a warm 29.6°C (85.3°F), nearly identical to November's 30.7°C (87.3°F). In Kupang, a slight decrease from the daytime peak is noted during the month of December, with an average low-temperature of 27.3°C (81.1°F).

Heat index

During December, the heat index is computed to be a torrid 35°C (95°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
One should consider that heat index numbers are for shaded settings and light wind. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', quantifies the warmth felt when relative humidity is considered. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In December, the average relative humidity is 75%.

Rainfall

In Kupang, in December, it is raining for 25 days, with typically 140mm (5.51") of accumulated precipitation. In Kupang, during the entire year, the rain falls for 153.3 days and collects up to 741mm (29.17") of precipitation.

Sea temperature

With an average sea temperature of 30.6°C (87.1°F), December is the month with the warmest seawater in Kupang.
Note: Swimming's cooling effect can be diminished in waters that have temperatures surpassing 30°C (86°F).

Daylight

With an average of 12h and 42min of daylight, December has the longest days of the year in Kupang.
On the first day of December in Kupang, sunrise is at 05:14 and sunset at 17:54. On the last day of the month, sunrise is at 05:27 and sunset at 18:09 WITA.

Sunshine

In Kupang, the average sunshine in December is 9.9h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Kupang. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In December, the maximum UV index of 7 translates into these guidelines:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Take heed! Reflections of sand and water make the Sun's UV rays stronger.