December weather forecast
Black River, Jamaica

The cold month of December presents a contrast to the rest of the year with temperatures acquiring a winter range, from a cool 19.6°C (67.3°F) to a moderate 27.1°C (80.8°F). Rainfall significantly drops to 65mm (2.56"), contributing to the chillier outlook. The decreasing daylight hours further emphasise the wintry feel. While sea temperatures continue to decline, they remain warm enough for the year-round water activities. This concludes the weather cycle of Black River for the year.

Temperature

At the start of December, Black River's average high-temperature reaches a still moderately hot 27.1°C (80.8°F), subtly different from the preceding month. December's average low-temperature reading in Black River settles at an enjoyable 19.6°C (67.3°F).

Heat index

The average heat index in December is estimated at a hot 30°C (86°F). A sense of exhaustion might occur with extended exposure and activity, potentially causing heat cramps.
Realize that the values for the heat index are set for shaded places and light winds. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. 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. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.

Humidity

The average relative humidity in December is 85%.

Rainfall

In Black River, in December, it is raining for 23.9 days, with typically 65mm (2.56") of accumulated precipitation. In Black River, during the entire year, the rain falls for 297.9 days and collects up to 1472mm (57.95") of precipitation.

Sea temperature

In December, the average sea temperature is 28.3°C (82.9°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

December has the shortest days of the year in Black River, with an average of 11h and 6min of daylight.
On the first day of the month, sunrise is at 06:26 and sunset at 17:34. On the last day of December, sunrise is at 06:42 and sunset at 17:46 EST.

Sunshine

In December, the average sunshine is 6.3h.

UV index

In December, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index of 6 during December translates into these guidelines:
Ward off overexposure. Defence against solar harm is crucial. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Watch out! Reflections from sand and water can surge UV radiation exposure.