December weather forecast
Caño Negro, Costa Rica

December, the first month of the winter in Caño Negro, is also a moderately hot month, with an average temperature ranging between max 29.7°C (85.5°F) and min 22.1°C (71.8°F).

Temperature

As Caño Negro welcomes December, the average high-temperature stabilizes at a still warm 29.7°C (85.5°F), showing little deviation from November's 29.1°C (84.4°F). Caño Negro usually reports an average low-temperature of 22.1°C (71.8°F) during the month of December.

Heat index

For December, the heat index is estimated at a very hot 35°C (95°F). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
Heat index readings emphasize conditions of light breezes and shaded spots. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. 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 extremely significant for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

In December, the average relative humidity is 75%.

Rainfall

In Caño Negro, in December, during 10.8 rainfall days, 19mm (0.75") of precipitation is typically accumulated. Throughout the year, there are 218.6 rainfall days, and 1456mm (57.32") of precipitation is accumulated.

Daylight

With an average of 11h and 30min of daylight, December has the shortest days of the year in Caño Negro.
On the first day of December, sunrise is at 05:40 and sunset at 17:13. On the last day of the month, sunrise is at 05:55 and sunset at 17:26 CST.

Sunshine

In Caño Negro, Costa Rica, the average sunshine in December is 9.6h.

UV index

January through September and December, with an average maximum UV index of 7, are months with the highest UV index in Caño Negro. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, a daily UV index of 7 turns into the following recommendations:
Prevent overexposure. Protection from the sun's harmful effects is needed. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.