December weather forecast
San Pedro Nonualco, El Salvador

The first month of the winter, December, is also a hot month in San Pedro Nonualco, El Salvador, with an average temperature fluctuating between 20°C (68°F) and 31.8°C (89.2°F).

Temperature

December registers an average high-temperature of a still tropical 31.8°C (89.2°F), slightly varied from November's 31.5°C (88.7°F). San Pedro Nonualco reports a consistent average low-temperature of 20°C (68°F) throughout December nights.

Heat index

During December, the heat index is appraised at a sweltering 39°C (102.2°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', determines the feeling of heat when you account for the relative humidity. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

In December, the average relative humidity is 68%.

Rainfall

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

Daylight

With an average of 11h and 18min of daylight, December has the shortest days of the year in San Pedro Nonualco.
On the first day of December in San Pedro Nonualco, 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 San Pedro Nonualco is December, with an average of 7.6h of sunshine.

UV index

The months with the highest UV index in San Pedro Nonualco are January through July and December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The daily high UV index of 7 during December translates into the following recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Boost your sun resistance with garments that are densely woven yet spacious.