December weather forecast
Nejapa, El Salvador

December continues the trend set by November and welcomes amplified sunshine days, standing at 28.5 days total. Marked by pleasant weather conditions, the month sees drier days with the lowest rainfall recorded throughout the year, 4mm (0.16"). Even though a brisk rise in wind speed is observed, the month remains moderately calm, complementing the festive mood. Furthermore, pressure readings become slightly higher, stabilizing the overall weather conditions. Wrapping up the year, December reinforces the city's warm charm by providing optimal conditions for outdoor pursuits.

Temperature

In December, Nejapa's weather conditions record an average high-temperature of a still moderately hot 29.9°C (85.8°F), aligned with the preceding month. Nejapa experiences a steady low-temperature of 19.5°C (67.1°F) throughout December.

Heat index

In December, the average heat index is estimated at a sweltering 35°C (95°F). Take more caution, heat exhaustion and heat cramps may occur. Long-lasting activity may cause heatstroke.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', melds the effects of warmth and moisture to generate a feeling of heat. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. 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 quite important for babies and toddlers. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.

Humidity

The average relative humidity in December is 70%.

Rainfall

In Nejapa, during December, the rain falls for 2.3 days and regularly aggregates up to 4mm (0.16") of precipitation. Throughout the year, there are 187 rainfall days, and 1106mm (43.54") 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 December, sunrise is at 06:05 and sunset at 17:27. On the last day of the month, sunrise is at 06:20 and sunset at 17:40 CST.

Sunshine

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

UV index

The months with the lowest UV index are January, May, June, August through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, a daily maximum UV index of 6 leads to the following instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Enhance your sun protection with tightly woven, yet airy clothing.