December weather forecast
Santa Rosa de Lima, El Salvador

As December sets in, Santa Rosa de Lima embraces a farewell to the year with a return to its driest weather. The city experiences a significant drop in rainfall to just 5mm (0.2"), the lowest throughout the year, indicating the full onset of the dry spell. December's climate displays quintessential tropical charm with comfortable temperatures, low precipitation levels, and a decent amount of sunshine. The weather proves amicable for tourists seeking outdoor escapades or even for locals relishing a warm Christmas. The delightful weather remains a fitting end to Santa Rosa de Lima's annual climatic cycle.

Temperature

December begins with an average high-temperature of a still tropical 32°C (89.6°F), reflecting close similarity to the preceding month. Santa Rosa de Lima's average low-temperature in the month of December is recorded at a pleasant 20.1°C (68.2°F).

Heat index

In December, the heat index is evaluated at a torrid 39°C (102.2°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

In Santa Rosa de Lima, the average relative humidity in December is 65%.

Rainfall

In Santa Rosa de Lima, during December, the rain falls for 4.1 days and regularly aggregates up to 5mm (0.2") of precipitation. Throughout the year, there are 188.2 rainfall days, and 954mm (37.56") 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 05:59 and sunset at 17:22. On the last day of the month, sunrise is at 06:14 and sunset at 17:35 CST.

Sunshine

The month with the least sunshine in Santa Rosa de Lima is December, with an average of 7.6h of sunshine.

UV index

The months with the highest UV index in Santa Rosa de Lima are January through August, November and December, with an average maximum UV index of 7. 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: In December, the maximum UV index of 7 translates into these guidelines:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.