December weather forecast
San Luis, Cuba

December ushers in the coolest average temperatures of the year in San Luis, between 20.2°C (68.4°F) to 28.3°C (82.9°F). Rainfall reduces further compared to November, reaching a low of 34mm (1.34") over 14.2 days. Cloud coverage hovers at 27%, slightly lower than the annual average. As the year approaches a close, daylight hours hit the annual low at 10.9 hours daily. Despite the lower temperatures and diminished rainfall, December retains a relative humidity of 82%, sustaining the city's overall moist climate.

Temperature

San Luis experiences a recorded average high-temperature of a still moderately hot 28.3°C (82.9°F) in December, closely aligned with November's 28.8°C (83.8°F). An average low-temperature of 20.2°C (68.4°F) is recorded in the month of December in San Luis.

Heat index

The heat index for December is evaluated at a tropical 33°C (91.4°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
The standards for the heat index are set for locations in shade and under light breezes. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.

Humidity

The average relative humidity in December in San Luis is 82%.

Rainfall

In San Luis, in December, during 14.2 rainfall days, 34mm (1.34") of precipitation is typically accumulated. Throughout the year, in San Luis, there are 242.5 rainfall days, and 898mm (35.35") of precipitation is accumulated.

Daylight

December has the shortest days of the year in San Luis, with an average of 10h and 54min of daylight.
On the first day of December, sunrise is at 06:22 and sunset at 17:22. On the last day of the month, sunrise is at 06:38 and sunset at 17:34 CST.

Sunshine

The average sunshine in December is 7h.

UV index

January through April, October through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: In December, an average UV index of 6 transforms into the following instructions:
Shun overexposure. Protection from sun ravages is indispensable. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Always opt for UVA and UVB-resistant sunglasses on radiant days.