December weather forecast
Culebra, PR

December welcomes cooler days in Culebra, as both land and sea experience consistent drops in temperatures. Despite the overall decrease, the temperature remains higher than the yearly average, maintaining the island's tropical feel during the holiday season. The decrease in rainfall, to 2.05" (52mm) over 22.6 days, forecasts a drier season on the horizon. The short daylight hours and less sunshine, in contrast to previous months, suits the winter atmosphere. Steady wind speeds mark the beginning of a windy new year in Culebra.

Temperature

With the arrival of December, Culebra's average high-temperature registers at a still warm 80.6°F (27°C), indicating a subtle variation from the previous month. An average temperature of 78.4°F (25.8°C) is logged during the nights of December in Culebra, a small step down from daytime highs.

Heat index

December's mean heat index is estimated at 84.2°F (29°C). Uninterrupted activity during exposure could lead to a sense of exhaustion, possibly causing heat cramps.
One should consider that heat index numbers are for shaded settings and light wind. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.

Humidity

The months with the lowest humidity in Culebra, Puerto Rico, are January through March, October through December, with an average relative humidity of 75%.

Rainfall

In Culebra, during December, the rain falls for 22.6 days and regularly aggregates up to 2.05" (52mm) of precipitation. In Culebra, during the entire year, the rain falls for 253.1 days and collects up to 33.27" (845mm) of precipitation.

Ocean temperature

In Culebra, Puerto Rico, the average seawater temperature in December is 81.5°F (27.5°C).
Note: Surface water temperatures falling between 77°F (25°C) and 84.2°F (29°C) are regarded as prime and extremely agreeable for enduring periods during any water activity.

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 6:37 am and sunset at 5:43 pm. On the last day of December, in Culebra, sunrise is at 6:52 am and sunset at 5:56 pm AST.

Sunshine

The months with the least sunshine in Culebra, Puerto Rico, are November and December, with an average of 6.5h of sunshine.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: An average UV index of 7 in December transforms into this advice:
Inhibit overexposure. Warding off sun damage is of utmost importance. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full 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. Take heed! Reflections of sand and water make the Sun's UV rays stronger.