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

November's transformation into December witnesses an average high-temperature of a still moderately hot 29.5°C (85.1°F), noting a minor change from the preceding month. Throughout December, the average low-temperature dips to an agreeable 22.5°C (72.5°F).

Heat index

December's average heat index is calculated to be a very hot 36°C (96.8°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

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

Rainfall

In December, the rain falls for 10.7 days. Throughout December, 21mm (0.83") of precipitation is accumulated. In Sámara, during the entire year, the rain falls for 205 days and collects up to 1087mm (42.8") of precipitation.

Sea temperature

In December, the average sea temperature is 28°C (82.4°F).
Note: For any water activity, surface water temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed perfect and extremely pleasing for enduring enjoyment.

Daylight

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

Sunshine

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

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index, 7 in December, converts into the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be alert! The reflection of water and sand augments UV radiation intensity.