December weather forecast
Cozumel, Mexico

December marks the end of the year with the onset of winter, characterized by shorter daylight hours and a further drop in sea temperature. The UV index decreases to 7, but sun protection remains advisable during peak sun hours. Albeit lower on the scale, a temperature range between 20.3°C and 28.6°C provides generally pleasant weather. Contrary to November, December experiences a lower amount of rainfall to the tune of 107mm.

Temperature

In Cozumel, the coldest period comes during January and December, when the average high-temperature touches 28.6°C.

Heat index

In December, the average heat index is evaluated at a hot 34°C. More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', 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. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.

Humidity

In Cozumel, the average relative humidity in December is 83%.

Rainfall

In Cozumel, Mexico, in December, during 9.8 rainfall days, 107mm of precipitation is typically accumulated. Throughout the year, there are 119.9 rainfall days, and 1490mm of precipitation is accumulated.

Sea temperature

In Cozumel, in December, the average water temperature is 27°C.
Note: Water activities in temperatures ranging from 25°C to 29°C are pleasurable, without feeling uncomfortable even during extended periods.

Daylight

December has the shortest days of the year, with an average of 10h and 54min of daylight.
On the first day of December, sunrise is at 7:07 am and sunset at 6:06 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 6:18 pm EST.

Sunshine

The average sunshine in December is 6.2h.

UV index

The months with the lowest UV index in Cozumel, Mexico, are January and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: An average maximum UV index of 7 in December leads to these recommendations:
Guard oneself from overexposure. Defence against sun injury is vital. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.