December weather forecast
Nuku'alofa, Tonga

The first month of the summer, December, is still a warm month in Nuku'alofa, Tonga, with temperature in the range of an average high of 28.7°C (83.7°F) and an average low of 22.5°C (72.5°F).

Temperature

In December, the average high-temperature is essentially the same as in November - a still moderately hot 28.7°C (83.7°F). In December, the average low-temperature is 22.5°C (72.5°F).

Heat index

The average heat index in December is appraised at a tropical 33°C (91.4°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, clothing, wind), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Nuku'alofa, the average relative humidity in December is 75%.

Rainfall

In December, in Nuku'alofa, the rain falls for 15 days. Throughout December, 175mm (6.89") of precipitation is accumulated. In Nuku'alofa, during the entire year, the rain falls for 180 days and collects up to 1721mm (67.76") of precipitation.

Sea temperature

In Nuku'alofa, the average seawater temperature in December is 26.6°C (79.9°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The month with the longest days in Nuku'alofa is December, with an average of 13h and 24min of daylight.
On the first day of December in Nuku'alofa, Tonga, sunrise is at 05:50 and sunset at 19:09. On the last day of the month, sunrise is at 06:02 and sunset at 19:25 +13.

Sunshine

In December, the average sunshine is 12h.

UV index

January through March, November and December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index value of 11, and more, symbolizes an extreme threat to health from unsafe exposure to UV radiation for the average person.
Note: The average daily UV index of 12 in December transform into the following instructions:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.