December weather forecast
Tepecoyo, El Salvador

December witnesses another noticeable transition in the weather pattern of Tepecoyo, El Salvador. This month signifies the onset of the dry season with significantly less rainfall. A further increase in temperature compared to November and a decrease in relative humidity starkly set December apart. Visitors and locals can look forward to increasing daylight hours filled with abundant sunshine. As the year concludes, December records the least amount of rainfall after January, recording a mere 4mm (0.16") over 2.3 days.

Temperature

December signals a high temperature of a still warm 29.9°C (85.8°F), showing little variation from November. Tepecoyo's nighttime temperature in December drops to an average of 19.5°C (67.1°F).

Heat index

December's mean heat index is calculated to be a very hot 35°C (95°F). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. 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 highly critical for babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In December, the average relative humidity is 70%.

Rainfall

In December, the rain falls for 2.3 days. Throughout December, 4mm (0.16") of precipitation is accumulated. Throughout the year, there are 187 rainfall days, and 1106mm (43.54") of precipitation is accumulated.

Daylight

The month with the shortest days is December, 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, in Tepecoyo, sunrise is at 06:21 and sunset at 17:41 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 in Tepecoyo are January, May, June, August through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 6 in December interprets into the following recommendations:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.