December weather forecast
Sacacoyo, El Salvador

The first month of the winter, December, is still a warm month in Sacacoyo, El Salvador, with an average temperature fluctuating between 19.5°C (67.1°F) and 29.9°C (85.8°F).

Temperature

December's start comes with an average high-temperature of a still moderately hot 29.9°C (85.8°F), in line with November's temperature. During the nights in December, Sacacoyo experiences a consistent average temperature of 19.5°C (67.1°F).

Heat index

December's heat index is estimated at a fiery hot 35°C (95°F). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', melds the effects of warmth and moisture to generate a feeling of heat. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

The average relative humidity in December is 70%.

Rainfall

In Sacacoyo, in December, during 2.3 rainfall days, 4mm (0.16") of precipitation is typically accumulated. Throughout the year, there are 187 rainfall days, and 1106mm (43.54") of precipitation is accumulated.

Daylight

December has the shortest days of the year, with an average of 11h and 18min of daylight.
On the first day of the month, sunrise is at 06:05 and sunset at 17:28. On the last day of December, sunrise is at 06:21 and sunset at 17:41 CST.

Sunshine

January and December, with an average of 7.7h of sunshine, are months with the least sunshine.

UV index

January, May, June, August through December, with an average maximum UV index of 6, are months with the lowest UV index. 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: An average UV index of 6 in December transforms into this advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.