December weather forecast
Usulutan, El Salvador

December in Usulutan warmly welcomes the dry season, with minimal rainfall registering at 11mm (0.43"). The dry spell in the climate marks a shift from the recent cooler months, and temperatures move subtly upwards. Less humidity and improved visibility dominate the weather scenario, enhancing the overall sunshine hours. As the year draws to a close, wind conditions remain relatively stable, contributing to the overall pleasant weather. With the longest nights of the year, Usulutan celebrates the festive season under largely clear skies and favorable weather conditions.

Temperature

In December, Usulutan notes an average high-temperature of a still tropical 31.1°C (88°F), hardly different from the preceding month. Nighttime temperature lowers to an average of 20.7°C (69.3°F) in December.

Heat index

The average heat index in December is appraised at a sweltering 38°C (100.4°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance 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.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

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

Rainfall

In Usulutan, during December, the rain falls for 4.8 days and regularly aggregates up to 11mm (0.43") of precipitation. Throughout the year, in Usulutan, there are 206.2 rainfall days, and 1242mm (48.9") of precipitation is accumulated.

Daylight

The month with the shortest days is December, with an average of 11h and 24min of daylight.
On the first day of the month, sunrise is at 06:01 and sunset at 17:24. On the last day of December, sunrise is at 06:16 and sunset at 17:37 CST.

Sunshine

With an average of 7.6h of sunshine, December has the least sunshine of the year in Usulutan.

UV index

January through September and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: In December, the maximum UV index of 7 transforms into these recommendations:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.