December weather forecast
Haikou, China

Wrapping up the year, December shifts entirely into milder temperatures, hinting at January’s colder conditions. Rainfall levels drop significantly from November, ushering in one of the driest months. Despite the lessened rainfall, the relative humidity marginally increases, providing a pleasant and comfortable weather experience. With its cooler temperatures and fewer rainy days, December serves as a refreshing end to the year in Haikou's tropical clime.

Temperature

December is characterized by a slight reduction in average high-temperature, easing from a warm 25.1°C (77.2°F) in November to an agreeable 22°C (71.6°F). Haikou observes an average nighttime low-temperature of 16.7°C (62.1°F) during the month of December.

Humidity

In Haikou, the average relative humidity in December is 81%.

Rainfall

In Haikou, during December, the rain falls for 7.3 days and regularly aggregates up to 35mm (1.38") of precipitation. In Haikou, China, during the entire year, the rain falls for 145 days and collects up to 1652mm (65.04") of precipitation.

Sea temperature

In Haikou, in December, the average water temperature is 21.9°C (71.4°F).
Note: Swimming in 21.9°C (71.4°F) is not an enjoyable experience for most. Breathing becomes progressively more challenging as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

With an average of 10h and 54min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 06:58 and sunset at 17:58. On the last day of December, in Haikou, sunrise is at 07:14 and sunset at 18:10 CST.

Sunshine

In December, the average sunshine is 4.2h.

UV index

With an average maximum UV index of 7, December is the month with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, the maximum UV index of 7 transforms into these recommendations:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be mindful! Sand and water reflections can up the Sun's UV exposure.