December weather forecast and climate
Port of Spain, Trinidad and Tobago

December, the first month of the winter, in Port of Spain, is also a hot month, with average temperature fluctuating between 31.1°C (88°F) and 21°C (69.8°F).

Temperature

In December, the average high-temperature is essentially the same as in November - a still hot 31.1°C (88°F). In Port of Spain, the average low-temperature is 21°C (69.8°F).

Heat index

The average heat index in December is appraised at a blistering 42.7°C (108.9°F). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, metabolic differences, clothing), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

In December, the average relative humidity in Port of Spain is 84%.

Rainfall

In Port of Spain, during December, the rain falls for 13 days and regularly aggregates up to 75.7mm (2.98") of precipitation. Throughout the year, in Port of Spain, there are 166 rainfall days, and 1408mm (55.43") of precipitation is accumulated.

Sea temperature

In December, the average sea temperature in Port of Spain, Trinidad and Tobago, is 27°C (80.6°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The month with the shortest days is December, with an average of 11.5h of daylight.

Sunshine

The average sunshine in Port of Spain is 6.9h.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 9. A UV Index value of 8 to 10 symbolizes a very high threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 9 in December transform into the following instructions:
Take extra precautions. Protection against sun damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.