December weather forecast
Soyapango, El Salvador

December holds the distinction of being the driest month, with rainfall dropping to a mere 6mm (0.24"). The city's weather becomes noticeably cooler, complementing the festive season of Christmas and New Year celebrations. While the decrease in daylight hours and temperature marks the onset of winter, the weather remains generally comfortable, wrapping up the year's weather patterns fittingly.

Temperature

December's onset sees an average high-temperature of a still tropical 30.8°C (87.4°F), exhibiting a slight fluctuation from the previous month. Throughout December, the temperature in Soyapango falls to an average low of 19.1°C (66.4°F).

Heat index

Throughout December, the heat index is evaluated at a very hot 37°C (98.6°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

In Soyapango, the average relative humidity in December is 69%.

Rainfall

In Soyapango, in December, it is raining for 2.8 days, with typically 6mm (0.24") of accumulated precipitation. In Soyapango, during the entire year, the rain falls for 196.7 days and collects up to 1216mm (47.87") of precipitation.

Daylight

The month with the shortest days in Soyapango is December, with an average of 11h and 18min of daylight.
On the first day of the month, sunrise is at 06:04 and sunset at 17:27. On the last day of December, sunrise is at 06:19 and sunset at 17:39 CST.

Sunshine

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

UV index

The months with the lowest UV index are May through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum UV index, 6 during December, leads to the following recommendations:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.