December weather forecast
Sámara, Costa Rica

As Sámara, Costa Rica, progresses into December, a further decrease in rainfall to 21mm (0.83") symbolizes the end of the rainy season. Both the daytime temperature and relative humidity fall slightly, reflecting the onset of cooler and drier conditions. Sea temperatures exhibit a slight rise from its November figure, making for tempting beach days. The daylight hours slightly decrease to match January's average, marking the year's close. Significantly, the UV index retains its consistent level of 7, emphasizing the need for sun protection all year round.

Temperature

December begins with an average high-temperature of a still warm 29.5°C (85.1°F), reflecting close similarity to the preceding month. In the month of December, an average of 22.5°C (72.5°F) marks the low-temperature in Sámara, Costa Rica.

Heat index

The average heat index in December is calculated to be a fiery hot 36°C (96.8°F). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.
Keep in mind the heat index values are meant for areas in shade and with light wind. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', embodies the combination of air temperature and moisture content to illustrate perceived heat. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are essentially critical for children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

In Sámara, the average relative humidity in December is 78%.

Rainfall

In Sámara, in December, it is raining for 10.7 days, with typically 21mm (0.83") of accumulated precipitation. Throughout the year, there are 205 rainfall days, and 1087mm (42.8") of precipitation is accumulated.

Sea temperature

In Sámara, Costa Rica, the average seawater temperature in December is 28°C (82.4°F).
Note: Water activities including swimming and diving at temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed very pleasurable and enjoyable for extended periods, devoid of discomfort.

Daylight

With an average of 11h and 36min of daylight, December has the shortest days of the year in Sámara.
On the first day of December, sunrise is at 05:43 and sunset at 17:19. On the last day of the month, sunrise is at 05:58 and sunset at 17:32 CST.

Sunshine

In December, the average sunshine in Sámara, Costa Rica, is 9.5h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Sámara. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index, 7 in December, converts into the following recommendations:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be wary! Reflections from sand and water make UV radiation more intense.