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

In December, Culebra notes an average high-temperature of a still moderately hot 80.6°F (27°C), hardly different from the preceding month. A minor drop in temperature is observed from daytime highs during the nights of December, averaging a still moderately hot 78.4°F (25.8°C).

Heat index

The heat index value during December is computed to be 84.2°F (29°C). Ongoing activity coupled with exposure often results in weariness and could induce heat cramps.
Heat index values are typically calculated for conditions of shade and a light breeze. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.

Humidity

January through March, October through December, with an average relative humidity of 75%, are the least humid months.

Rainfall

In Culebra, in December, during 22.6 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. Throughout the year, there are 253.1 rainfall days, and 33.27" (845mm) of precipitation is accumulated.

Ocean temperature

In Culebra, in December, the average water temperature is 81.5°F (27.5°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is perceived as agreeably warm, making all water activities enjoyable without the risk of discomfort over lengthy durations.

Daylight

The month with the shortest days is December, with an average of 11h and 6min of daylight.
On the first day of December, sunrise is at 6:37 am and sunset at 5:43 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 5:56 pm AST.

Sunshine

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

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. 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 vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 7 in December transforms into the following instructions:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Warning! Reflective surfaces like sand and water amplify the Sun's UV radiation.