December weather forecast
Manzanillo, Cuba

December concludes the weather year in Manzanillo as it returns to the conditions experienced in January. Steady rainfall, relative humidity, and comfortable temperatures wrap up the year with general contentment. The weather calms down, with temperatures dropping down to a cooler 29°C (84.2°F). As the final month, December rounds off the year with a pleasantly mild climate, welcoming the upcoming new year in Cuban style.

Temperature

The onset of December brings an average high-temperature of a still moderately hot 29°C (84.2°F), nearly matching the November temperature. During the nights in December, Manzanillo observes an average low-temperature of 20.8°C (69.4°F).

Heat index

The heat index for December is appraised at a very hot 35°C (95°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Realize that the values for the heat index are set for shaded places and light winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a composite of temperature and humidity figures to convey how warm it feels. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In Manzanillo, the average relative humidity in December is 79%.

Rainfall

In Manzanillo, in December, during 10.5 rainfall days, 16mm (0.63") of precipitation is typically accumulated. Throughout the year, there are 216.6 rainfall days, and 605mm (23.82") of precipitation is accumulated.

Sea temperature

In Manzanillo, the average seawater temperature in December is 27.8°C (82°F).
Note: For any water activity, having surface water temperatures from 25°C (77°F) to 29°C (84.2°F) is considered outstanding and highly delightful for lengthened periods.

Daylight

The month with the shortest days is December, with an average of 10h and 54min of daylight.
On the first day of the month, sunrise is at 06:28 and sunset at 17:27. On the last day of December, sunrise is at 06:44 and sunset at 17:39 CST.

Sunshine

In December, the average sunshine is 7.2h.

UV index

January, February, November and December, with an average maximum UV index of 6, are months with the lowest UV index in Manzanillo. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, a regular UV index of 6 translates into these guidelines:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Notice! The reflection of water and sand increases the UV radiation significantly.