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 (67.1°F), 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

As December takes hold, the average high-temperature is a still warm 29.1°C (84.4°F), nearly mirroring that of the previous month. An average low-temperature of 19.5°C (67.1°F) is anticipated throughout the nights in Merida, Mexico, during December.

Heat index

December's average heat index is appraised at a tropical 34°C (93.2°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', quantifies the warmth felt when relative humidity is considered. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. 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 Merida, Mexico, the average relative humidity in December is 75%.

Rainfall

In Merida, during December, the rain falls for 11.5 days and regularly aggregates up to 24mm (0.94") of precipitation. In Merida, during the entire year, the rain falls for 167.3 days and collects up to 536mm (21.1") of precipitation.

Daylight

December has the shortest days of the year in Merida, Mexico, with an average of 10h and 54min of daylight.
On the first day of the month, sunrise is at 6:19 am and sunset at 5:16 pm. On the last day of December, sunrise is at 6:35 am and sunset at 5:28 pm CST.

Sunshine

In December, the average sunshine in Merida 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 value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: An average maximum UV index of 6 in December leads to these recommendations:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.