December weather forecast
La Union, El Salvador

December puts on a splendid display of La Union's climatic versatility with distinct weather patterns. The largest shift experienced in December is the drastic drop of rainfall to only 3mm (0.12") from November's 37mm (1.46"). This marks the start of the dry season and the closing of the year. Despite shorter hours of daylight, sunshine dominants most of the day. The city's landscapes take on a different kind of beauty, with less humidity and light winds offering pleasant weather for year-end festivities.

Temperature

The commencement of December in La Union brings an average high-temperature of a still hot 31.8°C (89.2°F), marking an inconsequential divergence from November. Throughout December, the temperature tends to fall to a consistent average low of 21.8°C (71.2°F).

Heat index

For most parts of December, the heat index is evaluated at a fiery hot 38°C (100.4°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'feels like', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

The average relative humidity in December in La Union is 64%.

Rainfall

In La Union, in December, during 3.9 rainfall days, 3mm (0.12") of precipitation is typically accumulated. In La Union, during the entire year, the rain falls for 201.6 days and collects up to 974mm (38.35") of precipitation.

Sea temperature

In La Union, El Salvador, the average seawater temperature in December is 28°C (82.4°F).
Note: Temperatures between 25°C (77°F) and 29°C (84.2°F) are excellent for swimming, diving, and other water activities, providing comfort and enjoyment for extended periods without discomfort.

Daylight

The month with the shortest days in La Union is December, with an average of 11h and 24min of daylight.
On the first day of December, sunrise is at 05:58 and sunset at 17:22. On the last day of the month, sunrise is at 06:14 and sunset at 17:35 CST.

Sunshine

In December, the average sunshine is 7.8h.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index, 7 during December, leads to the following recommendations:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Alert! Sand and water increase UV exposure due to their reflective properties.