December weather forecast
Bagaces, Costa Rica

The first month of the winter, December, is still a warm month in Bagaces, Costa Rica, with an average temperature fluctuating between 29.5°C (85.1°F) and 22.2°C (72°F).

Temperature

An average high-temperature of a still warm 29.5°C (85.1°F) marks December, exhibiting a close resemblance to the conditions in November. December's average low-temperature reading settles at an agreeable 22.2°C (72°F).

Heat index

Throughout December, the heat index is calculated to be a very hot 36°C (96.8°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. 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. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

The average relative humidity in December is 78%.

Rainfall

In Bagaces, during December, the rain falls for 5.7 days and regularly aggregates up to 9mm (0.35") of precipitation. In Bagaces, during the entire year, the rain falls for 188.5 days and collects up to 1202mm (47.32") of precipitation.

Daylight

December has the shortest days of the year, with an average of 11h and 30min of daylight.
On the first day of December in Bagaces, sunrise is at 05:43 and sunset at 17:16. On the last day of the month, sunrise is at 05:58 and sunset at 17:30 CST.

Sunshine

In Bagaces, the average sunshine in December is 9.6h.

UV index

The months with the highest UV index in Bagaces are January through October and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 7 suggests these recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.