December weather forecast
Frederiksted, VI

In December, Frederiksted ushers in cooler temperature ranges from 81.3°F (27.4°C) to 79.3°F (26.3°C). While daylight hours further shorten to 11.1 hours, the city continues to receive about 6.4 hours of sunshine on an average per day. Comparatively lower wind speeds and a lesser amount of rainfall on roughly 23 days marks December. With less heat and humidity, December seems to be a refreshing and pleasant end to the Frederiksted's annual weather cycle.

Temperature

The initiation of December records an average high-temperature of a still moderately hot 81.3°F (27.4°C), displaying a near consistency with the previous month. Frederiksted records a slight downturn to an average a still warm 79.3°F (26.3°C) during the nights of December.

Heat index

In December, the average heat index is calculated to be a tropical 86°F (30°C). Continuous exposure and activity could induce a sense of tiredness and subsequently, heat cramps.
Heat index's context suggests values are appropriate for shady areas and slight breezes. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'feels like', takes into account both air temperature and humidity to illustrate what people actually feel. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.

Humidity

The months with the lowest humidity are January through March and December, with an average relative humidity of 75%.

Rainfall

In Frederiksted, during December, the rain falls for 22.7 days and regularly aggregates up to 1.97" (50mm) of precipitation. Throughout the year, there are 254.5 rainfall days, and 29.49" (749mm) of precipitation is accumulated.

Daylight

December has the shortest days of the year, with an average of 11h and 6min of daylight.
On the first day of the month, sunrise is at 6:34 am and sunset at 5:43 pm. On the last day of December, in Frederiksted, sunrise is at 6:50 am and sunset at 5:55 pm AST.

Sunshine

The month with the least sunshine is December, with an average of 6.4h of sunshine.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Frederiksted. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Frederiksted. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high daily UV index of 7 during December translates into the following directions:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.