December weather forecast
Puerto Jiménez, Costa Rica

December in Puerto Jiménez marks a significant shift from the preceding month’s rainfall spectrum. The month experiences a decline in temperature, humidity, and rainfall, bringing about drier and cooler conditions. December's weather features a significant reduction in rainfall volume, dropping to 105mm (4.13"), indicating the arrival of the dry season. The change ushers in reduced cloud coverage and improvements in visibility, leading to brighter skies. December, thus, leaves a mark as the month with the least amount of rainfall, closing the annual weather cycle in Puerto Jiménez with pleasant and mild conditions.

Temperature

December's onset in Puerto Jiménez brings an average high-temperature of a still warm 28.6°C (83.5°F), showing a minute difference from November's 27.7°C (81.9°F). December brings with it a nighttime average temperature of 20.8°C (69.4°F).

Heat index

The average heat index in December is evaluated at a tropical 34°C (93.2°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', provides an understanding of perceived warmth by combining temperature and relative humidity. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.

Humidity

The average relative humidity in December in Puerto Jiménez is 83%.

Rainfall

In Puerto Jiménez, during December, the rain falls for 25.8 days and regularly aggregates up to 105mm (4.13") of precipitation. Throughout the year, there are 309.5 rainfall days, and 2106mm (82.91") of precipitation is accumulated.

Daylight

With an average of 11h and 36min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 05:32 and sunset at 17:12. On the last day of December, sunrise is at 05:47 and sunset at 17:25 CST.

Sunshine

The average sunshine in December is 9.2h.

UV index

The months with the lowest UV index are January, February, June through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high daily UV index of 6 during December translates into the following directions:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.