December weather forecastMerida, Mexico
December
Weather in December
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
The shift to December signals an average high-temperature of a still moderately hot 29.1°C (84.4°F), subtly varied from November's 29.6°C (85.3°F). An average low-temperature of 19.5°C (67.1°F) marks the nights throughout December.Heat index
The average heat index in December is estimated at a tropical 34°C (93.2°F). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.Understand that the heat index values take into account shaded locations and mild winds. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', comes about by integrating the temperature readings with the humidity levels. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
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 (0.94") of accumulated precipitation. Throughout the year, there are 167.3 rainfall days, and 536mm (21.1") of precipitation is accumulated.Daylight
With an average of 10h and 54min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 6:19 am and sunset at 5:16 pm. On the last day of the month, 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
January, November and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The daily maximum UV index of 6 in December interprets into the following advice:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Merida, Mexico
- Average high temperature in December: 29.1°C
The warmest month (with the highest average high temperature) is May (35.4°C).
The month with the lowest average high temperature is January (28.1°C).
- Average low temperature in December: 19.5°C
The month with the highest average low temperature is June (24.3°C).
The coldest month (with the lowest average low temperature) is January (18.6°C).
Average pressure in December
Merida, Mexico
- Average pressure in December: 1016.4mbar
The month with the highest atmospheric pressure is January (1017.6mbar).
The month with the lowest atmospheric pressure is September (1011.9mbar).
Average wind speed in December
Merida, Mexico
- Average wind speed in December: 13.5km/h
The windiest month (with the highest average wind speed) is March (16.1km/h).
The calmest month (with the lowest average wind speed) is September (10.6km/h).
Average humidity in December
Merida, Mexico
- Average humidity in December: 75%
The months with the highest relative humidity are September and October (78%).
The months with the lowest relative humidity are April and May (63%).
Average rainfall in December
Merida, Mexico
- Average rainfall in December: 24mm
The wettest month (with the highest rainfall) is June (99mm).
The driest months (with the least rainfall) are February and March (12mm).
Average rainfall days in December
Merida, Mexico
- Average rainfall days in December: 11.5 days
The month with the highest number of rainy days is September (20.4 days).
The months with the least rainy days are February and March (7.2 days).
Average daylight in December /
Average sunshine in December
Merida, Mexico
- Average daylight in December: 10h and 54min
The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).
- Average sunshine in December: 6h and 18min
The month with the most sunshine is May (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).
Average sunshine days in December
Merida, Mexico
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is March (21.8 days).
The month with the least sunshine days is October (8.5 days).
Average UV index in December
Merida, Mexico
- Average UV index in December: 6
The months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, November and December (UV index 6).
Average cloud cover in December
Merida, Mexico
- Average cloud cover in December: 33
The month with the most cloud cover is January (Cloud cover 36).
The months with the least cloud cover are March and April (Cloud cover 25).
Average visibility in December
Merida, Mexico
- Average visibility in December: 9km
The months with the highest visibility are February, March, April, May and June (10km).
The month with the lowest visibility is September (8km).
