Merida
Mexico
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Merida, Mexico

Scenic spring view of the Santa Ana Church in Merida, Mexico, surrounded by beautiful flowers and palm trees
Scenic spring view of the Santa Ana Church in Merida, Mexico, surrounded by beautiful flowers and palm trees
The first month of the winter, December, is also a hot month in Merida, Mexico, with average temperature fluctuating between 17.5°C (63.5°F) and 30.6°C (87.1°F).

Temperature

December is the coldest month, with an average high-temperature of 30.6°C (87.1°F) and an average low-temperature of 17.5°C (63.5°F).

Heat index

In December, the average heat index is appraised at a very hot 37.4°C (99.3°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, clothing, metabolic differences, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

The average relative humidity in December is 73%.

Rainfall

In Merida, during 4.3 rainfall days, 45.1mm (1.8") of precipitation is typically accumulated. Throughout the year, there are 86.6 rainfall days, and 1036.9mm (40.8") of precipitation is accumulated.

Daylight

The month with the shortest days in Merida is December, with an average of 10.9h of daylight.

Sunshine

The month with the least sunshine is December, with an average of 6.5h of sunshine.

UV index

Months with the lowest UV index in Merida, 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 vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 in December interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the coldest month in Merida?

With an average high-temperature of 30.6°C (87.1°F) and an average low-temperature of 17.5°C (63.5°F), December is the coldest month in Merida.

What is the temperature in December in Merida?

The average high-temperature, in December, is 30.6°C (87.1°F), while the average low-temperature is 17.5°C (63.5°F). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that combines air temperature and relative humidity, in December is evaluated at 37.4°C (99.3°F).

What is the average humidity in December in Merida?

In Merida, Mexico, the average relative humidity in December is 73%.

How much does it rain in Merida in December?

In Merida, Mexico, in December, during 4.3 rainfall days, 45.1mm (1.8") of precipitation is typically accumulated.

What is the month with the shortest days in Merida?

The month with the shortest days is December, with an average of 10.9h of daylight.

What is the average length of the day in December in Merida?

In December, the average length of the day in Merida, Mexico, is 10.9h.

What is the month with the least sunshine in Merida?

With an average of 6.5h of sunshine, December has the least sunshine of the year in Merida, Mexico.

How many hours of sunshine does Merida have in December?

In December, the average sunshine in Merida, Mexico, is 6.5h.

What is the month with the lowest UV index in Merida?

January and December, with an average maximum UV index of 7, are months with the lowest UV index in Merida, Mexico.

How high is the UV index in December in Merida?

The average daily maximum UV index in December is 7. A UV Index estimate of 6 to 7 represents a high health threat from the exposure to the Sun's UV rays.
Average temperature in December - Merida, Mexico
  • Average high temperature in December: 30.6°C

The warmest month (with the highest average high temperature) is May (36.3°C).
The month with the lowest average high temperature is December (30.6°C).

  • Average low temperature in December: 17.5°C

The month with the highest average low temperature is May (21.7°C).
The coldest month (with the lowest average low temperature) is January (17.2°C).

Average humidity in December - Merida, Mexico
  • Average humidity in December: 73%

The month with the highest relative humidity is September (76%).
Months with the lowest relative humidity are March and May (63%).

Average rainfall in December - Merida, Mexico
  • Average rainfall in December: 45.1mm

The wettest month (with the highest rainfall) is September (183.1mm).
The driest month (with the lowest rainfall) is March (22.5mm).

Average rainfall days in December - Merida, Mexico
  • Average rainfall days in December: 4.3 days

The month with the highest number of rainy days is September (13.9 days).
The month with the lowest number of rainy days is April (1.9 days).

Average daylight in December / Average sunshine in December - Merida, Mexico
  • Average daylight in December: 10.9h

The month with the longest days is June (Average daylight: 13.4h).
The month with shortest days is December (Average daylight: 10.9h).

  • Average sunshine in December: 6.5h

The month with most sunshine is May (Average sunshine: 8.8h).
The month with least sunshine is December (Average sunshine: 6.5h).

Average UV index in December - Merida, Mexico
  • Average UV index in December: 7

Months with the highest UV index are April, May, June, July and August (UV index 12).
Months with the lowest UV index are January and December (UV index 7).