December weather forecast
Juntas, Costa Rica

December, the first month of the winter in Juntas, is still a warm month, with an average temperature fluctuating between 29.7°C (85.5°F) and 22.1°C (71.8°F).

Temperature

The onset of December manifests an average high-temperature of a still moderately hot 29.7°C (85.5°F), demonstrating a minor variation from the preceding month. Throughout December, Juntas experiences a low-temperature average of 22.1°C (71.8°F).

Heat index

Throughout December, the heat index is estimated at a sweltering 35°C (95°F). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

The average relative humidity in December is 75%.

Rainfall

In December, the rain falls for 10.8 days. Throughout December, 19mm (0.75") of precipitation is accumulated. In Juntas, during the entire year, the rain falls for 218.6 days and collects up to 1456mm (57.32") of precipitation.

Daylight

With an average of 11h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 05:42 and sunset at 17:16. On the last day of December, sunrise is at 05:57 and sunset at 17:29 CST.

Sunshine

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

UV index

The months with the highest UV index in Juntas, Costa Rica, are January through September and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 7 during December translates into the following directions:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.