Chetumal
Mexico
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Chetumal, Mexico

The first month of the winter, December, is also a moderately hot month in Chetumal, Mexico, with average temperature ranging between min 18.9°C (66°F) and max 28.8°C (83.8°F).

Temperature

In December, the average high-temperature is practically the same as in November - a warm 28.8°C (83.8°F). In Chetumal, in December, the average low-temperature is 18.9°C (66°F).

Heat index

In December, the average heat index is estimated at a hot 34.2°C (93.6°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, wind, differences in body mass, height, and shape, and clothing 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

Months with the highest humidity in Chetumal are January, October through December, with an average relative humidity of 80%.

Rainfall

In December, the rain falls for 10.1 days. Throughout December, 65.4mm (2.6") of precipitation is accumulated. In Chetumal, Mexico, during the entire year, the rain falls for 123 days and collects up to 1307.6mm (51.5") of precipitation.

Sea temperature

In Chetumal, in December, the average water temperature is 26.9°C (80.4°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The month with the shortest days is December, with an average of 11h of daylight.

Sunshine

With an average of 6.6h of sunshine, December has the least sunshine of the year.

UV index

January, November and December, with an average maximum UV index of 8, are months with the lowest UV index. A UV Index of 8 to 10 symbolizes a very high health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 8 translate into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in December in Chetumal?

In December, in Chetumal, the average high-temperature is 28.8°C (83.8°F), and the average low-temperature is 18.9°C (66°F). In December, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that factores the actual air temperature with the relative humidity, is estimated at 34.2°C (93.6°F).

What is the most humid month in Chetumal?

Months with the highest humidity in Chetumal are January, October through December, with an average relative humidity of 80%.

What is the average humidity in December in Chetumal?

In December, the average relative humidity in Chetumal is 80%.

How many days does it rain in December in Chetumal?

In Chetumal, in December, during 10.1 rainfall days, 65.4mm (2.6") of precipitation is typically accumulated.

What is the water temperature in December in Chetumal?

In December, the average sea temperature in Chetumal is 26.9°C (80.4°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the month with the shortest days in Chetumal?

The month with the shortest days in Chetumal is December, with an average of 11h of daylight.

How many hours of daylight does Chetumal have in December?

The average length of the day in December in Chetumal is 11h.

What is the month with the least sunshine in Chetumal?

December has the least sunshine of the year, with an average of 6.6h of sunshine.

How long on average sun shines in December in Chetumal?

In December, the average sunshine in Chetumal, Mexico, is 6.6h.

What are the months with the lowest UV index in Chetumal?

January, November and December, with an average maximum UV index of 8, are months with the lowest UV index in Chetumal.

What is the UV index reading in December in Chetumal?

The average daily maximum UV index in December is 8. A UV Index of 8 to 10 symbolizes a very high health threat from the exposure to the Sun's UV rays.
Average temperature in December - Chetumal, Mexico
  • Average high temperature in December: 28.8°C

The warmest month (with the highest average high temperature) is August (32.8°C).
The month with the lowest average high temperature is January (28.5°C).

  • Average low temperature in December: 18.9°C

The month with the highest average low temperature is June (25°C).
The coldest month (with the lowest average low temperature) is January (18.3°C).

Average humidity in December - Chetumal, Mexico
  • Average humidity in December: 80%

Months with the highest relative humidity are January, October, November and December (80%).
The month with the lowest relative humidity is April (73%).

Average rainfall in December - Chetumal, Mexico
  • Average rainfall in December: 65.4mm

The wettest month (with the highest rainfall) is September (206.8mm).
The driest month (with the lowest rainfall) is March (26.4mm).

Average rainfall days in December - Chetumal, Mexico
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is September (15.8 days).
Months with the lowest number of rainy days are March and April (3.8 days).

Average sea temperature in December - Chetumal, Mexico
  • Average sea temperature in December: 26.9°C

The best month for swimming (with the highest average sea temperature) is September (29.7°C).
The coldest month (with the lowest average sea temperature) is January (26.2°C).

Average daylight in December / Average sunshine in December - Chetumal, Mexico
  • Average daylight in December: 11h

The month with the longest days is June (Average daylight: 13.2h).
The month with shortest days is December (Average daylight: 11h).

  • Average sunshine in December: 6.6h

The month with most sunshine is April (Average sunshine: 9.1h).
The month with least sunshine is December (Average sunshine: 6.6h).

Average UV index in December - Chetumal, Mexico
  • Average UV index in December: 8

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
Months with the lowest UV index are January, November and December (UV index 8).