December weather forecast
Castleton, Jamaica

The first month of the winter, December, is also a moderately hot month in Castleton, Jamaica, with an average temperature varying between 28.9°C (84°F) and 21.5°C (70.7°F).

Temperature

A minimal variation is noted in Castleton's average high-temperature at the onset of December, reaching a still moderately hot 28.9°C (84°F) from November's 29.7°C (85.5°F). The average low-temperature during December nights is an agreeable 21.5°C (70.7°F).

Heat index

The average heat index in December is computed to be a sweltering 35°C (95°F). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
Heat index readings emphasize conditions of light breezes and shaded spots. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a single figure representing how weather conditions feel when combining temperature and humidity. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

The months with the highest humidity are October through December, with an average relative humidity of 81%.

Rainfall

In Castleton, during December, the rain falls for 19.9 days and regularly aggregates up to 42mm (1.65") of precipitation. In Castleton, during the entire year, the rain falls for 265.1 days and collects up to 806mm (31.73") of precipitation.

Daylight

With an average of 11h and 6min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 06:23 and sunset at 17:30. On the last day of the month, sunrise is at 06:38 and sunset at 17:42 EST.

Sunshine

With an average of 6.7h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index are January through April, September, November and December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 6 in December translates into these instructions:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.