December weather forecast
Merida, Mexico

Merida wraps up the year with the onset of mild winter. With temperatures dropping down to an average of 19.5°C, it is the coolest month of the year. Despite slightly shorter days, the weather remains pleasant and enjoyable making it the perfect end to the year. December showcases a significant decline in rainfall, bringing forth drier days. It's an excellent time to explore Merida’s open-air markets and vibrant culture in the delightful weather.

Temperature

During December, Merida observes a subtle ascent to a still warm 29.1°C from November's 29.6°C in the average high-temperature. An average low-temperature of 19.5°C is anticipated throughout the nights in Merida during December.

Heat index

December's mean heat index is computed to be a tropical 34°C. Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', determines the feeling of heat when you account for the relative humidity. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values remain especially vital for babies and toddlers. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.

Humidity

In Merida, the average relative humidity in December is 75%.

Rainfall

In Merida, in December, it is raining for 11.5 days, with typically 24mm of accumulated precipitation. Throughout the year, in Merida, there are 167.3 rainfall days, and 536mm of precipitation is accumulated.

Daylight

With an average of 10h and 54min of daylight, December has the shortest days of the year in Merida.
On the first day of December, sunrise is at 6:18 am and sunset at 5:16 pm. On the last day of the month, sunrise is at 6:34 am and sunset at 5:27 pm CST.

Sunshine

In Merida, the average sunshine in December is 6.3h.

UV index

The months with the lowest UV index in Merida are January, November and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index, 6 during December, leads to the following recommendations:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.