December weather forecast
Port Royal, Jamaica

December culminates the year in Port Royal, making a noteworthy transition into drier and cooler conditions. The weather takes a cooler turn with the lowest average temperature of 22.4°C (72.3°F). Rainfall rates fall to an annual low of 76mm (2.99"), indicating the onset of the drier months. Steady sea temperatures ensure a soothing feel for beach-goers, despite the general dip in temperature. December celebrates the year-end under the Caribbean sky with moderate winds, adequate sunshine hours, and clearer days, setting the stage for the festivities to follow.

Temperature

As Port Royal welcomes December, the average high-temperature stabilizes at a still warm 27.8°C (82°F), showing little deviation from November's 28.6°C (83.5°F). In Port Royal, December's nights observe an average temperature dip to a pleasant 22.4°C (72.3°F).

Heat index

For most parts of December, the heat index is appraised at a tropical 32°C (89.6°F). Persisting in activity during long-term exposure might induce weariness, with subsequent heat cramps.
The standards for the heat index are set for locations in shade and under light breezes. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'feels like' or 'apparent temperature', blends air temperature and moisture content to represent the felt temperature to humans. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.

Humidity

The average relative humidity in December is 81%.

Rainfall

In Port Royal, during December, the rain falls for 25.7 days and regularly aggregates up to 76mm (2.99") of precipitation. In Port Royal, during the entire year, the rain falls for 310.9 days and collects up to 1286mm (50.63") of precipitation.

Sea temperature

In December, the average sea temperature in Port Royal is 28.3°C (82.9°F).
Note: Water activities in surface temperatures between 25°C (77°F) and 29°C (84.2°F) are seen as exceptional and extremely agreeable for lengthened time spans.

Daylight

The month with the shortest days is December, with an average of 11h and 6min of daylight.
On the first day of the month, sunrise is at 06:22 and sunset at 17:30. On the last day of December, sunrise is at 06:38 and sunset at 17:42 EST.

Sunshine

The month with the least sunshine is December, with an average of 6.5h of sunshine.

UV index

January through May, November and December, with an average maximum UV index of 6, are months with the lowest UV index in Port Royal. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 6 translates into these guidelines:
Deter overexposure. Protecting against the sun's effects is essential. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Opt for tightly woven and loose clothing to enhance protection from the Sun. Heads up! UV intensity is amplified by reflections from water and sand.