December weather forecast
San Jose Guayabal, El Salvador

December marks the arrival of the dry season in San Jose Guayabal, characterized by decreased rainfall and a gradual shift to cooler temperatures. With rainfall hitting a record low of 6mm (0.24"), the seasonal transition becomes glaringly obvious. This month encapsulates San Jose Guayabal's ability to offer varied climatic experiences within a year. Despite the chillier evenings, the city's tropical charm remains undeterred, thanks to the consistent daytime temperatures. Thus, December rounds off the year on a mild note, setting the stage for the weather cycle to resume anew.

Temperature

The transition from November to December sees an average high-temperature of a still tropical 30.8°C (87.4°F), indicating a minor variance from the prior month. The temperature in San Jose Guayabal lowers to an average of 19.1°C (66.4°F) during December nights.

Heat index

The average heat index in December is computed to be a sweltering 37°C (98.6°F). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
Keep in mind the heat index values are meant for areas in shade and with light wind. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', offers an insight into how hot it feels when we factor in moisture content. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Kids are generally in more danger than adults because they perspire less. Their large skin surface area compared to their small bodies and the excessive heat due to their actions raises their risk.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. 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. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

In San Jose Guayabal, the average relative humidity in December is 69%.

Rainfall

In San Jose Guayabal, in December, during 2.8 rainfall days, 6mm (0.24") of precipitation is typically accumulated. Throughout the year, there are 196.7 rainfall days, and 1216mm (47.87") of precipitation is accumulated.

Daylight

With an average of 11h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 06:04 and sunset at 17:26. On the last day of December, in San Jose Guayabal, sunrise is at 06:19 and sunset at 17:39 CST.

Sunshine

January and December, with an average of 7.7h of sunshine, are months with the least sunshine in San Jose Guayabal, El Salvador.

UV index

May through December, with an average maximum UV index of 6, are months with the lowest UV index in San Jose Guayabal. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 6 in December transforms into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.