December weather forecast
Santiago Nonualco, El Salvador

December, the first month of the winter in Santiago Nonualco, is still a tropical month, with an average temperature varying between 31.8°C (89.2°F) and 20°C (68°F).

Temperature

As November turns into December, the average high-temperatures rest at a still hot 31.8°C (89.2°F), showing a minor variation from the prior month. Throughout December, Santiago Nonualco's nights cool down to an average of 20°C (68°F).

Heat index

For December, the heat index is calculated to be a torrid 39°C (102.2°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Always consider that heat index estimations are for light winds and places in the shade. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is achieved by amalgamating air temperature with the relative humidity readings. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are largely significant for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In December, the average relative humidity is 68%.

Rainfall

In Santiago Nonualco, in December, it is raining for 5.7 days, with typically 9mm (0.35") of accumulated precipitation. In Santiago Nonualco, El Salvador, during the entire year, the rain falls for 216.4 days and collects up to 1164mm (45.83") of precipitation.

Daylight

December has the shortest days of the year in Santiago Nonualco, with an average of 11h and 18min of daylight.
On the first day of December, sunrise is at 06:03 and sunset at 17:26. On the last day of the month, sunrise is at 06:18 and sunset at 17:39 CST.

Sunshine

The month with the least sunshine in Santiago Nonualco is December, with an average of 7.6h of sunshine.

UV index

January through July and December, with an average maximum UV index of 7, are months with the highest UV index in Santiago Nonualco. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, a regular UV index of 7 translates into these guidelines:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.