December weather forecast and climate
Nuku'alofa, Tonga

December, the first month of the summer, in Nuku'alofa, is still a warm month, with average temperature varying between 22.5°C (72.5°F) and 28.7°C (83.7°F).

Temperature

In Nuku'alofa, the average high-temperature is relatively the same as in November - a still warm 28.7°C (83.7°F). In Nuku'alofa, Tonga, in December, the average low-temperature is 22.5°C (72.5°F).

Heat index

In December, the average heat index is estimated at a hot 33°C (91.4°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like pregnancy, wind, differences in body mass, height, and shape, and activity influence one's weather impression. 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. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in Nuku'alofa 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 water temperature is 26.6°C (79.9°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

December has the longest days of the year in Nuku'alofa, with an average of 13.4h of daylight.

Sunshine

In December, the average sunshine in Nuku'alofa is 12h.

UV index

Months with the highest UV index are January through March, November and December, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an ultimate health vulnerability from unsafe exposure to the UV radiation for the average person.
Note: In December, the average maximum UV index of 12 translate into the following recommendations:
Take all necessary precautions, as unprotected skin can burn in 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 strength of the UV rays is significantly increased by the reflection of the water and sand.