December weather forecast and climate
Monterrey, Mexico

The sun setting over Monterrey, Mexico, with a far view of the Sierra Madre mountain ranges
The sun setting over Monterrey, Mexico, with a far view of the Sierra Madre mountain ranges
The first month of the winter, December, is also a pleasant month in Monterrey, Mexico, with average temperature varying between 9.1°C (48.4°F) and 21.2°C (70.2°F).

Temperature

In December, the average high-temperature is 21.2°C (70.2°F), and the average low-temperature is 9.1°C (48.4°F).

Humidity

The average relative humidity in December is 69%.

Rainfall

The month with the least rainfall in Monterrey is December when the rain falls for 3.4 days and typically collects 14.1mm (0.6") of precipitation.

Daylight

The month with the shortest days is December, with an average of 10.6h of daylight.

Sunshine

December has the least sunshine of the year in Monterrey, with an average of 4.3h of sunshine.

UV index

January and December, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for the ordinary person.
In December, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in December in Monterrey?

In December, in Monterrey, Mexico, the average high-temperature is 21.2°C (70.2°F), and the average low-temperature is 9.1°C (48.4°F).

What is the average humidity in December in Monterrey?

In Monterrey, the average relative humidity in December is 69%.

How much does it rain in Monterrey in December?

In Monterrey, Mexico, during December, the rain falls for 3.4 days and regularly aggregates up to 14.1mm (0.6") of precipitation.

What is the driest month in Monterrey?

December is the month with the least rainfall in Monterrey. Rain falls for 3.4 days and accumulates 14.1mm (0.6") of precipitation.

What is the month with the shortest days in Monterrey?

The month with the shortest days in Monterrey is December, with an average of 10.6h of daylight.

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

In December, the average length of the day in Monterrey, Mexico, is 10.6h.

What is the month with the least sunshine in Monterrey?

With an average of 4.3h of sunshine, December has the least sunshine of the year in Monterrey.

How long on average sun shines in December in Monterrey?

The average sunshine in December in Monterrey is 4.3h.

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

January and December, with an average maximum UV index of 5, are months with the lowest UV index.

How high is the UV index in December in Monterrey?

The average daily maximum UV index in December in Monterrey is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV rays.
Average temperature in December - Monterrey, Mexico
  • Average high temperature in December: 21.2°C

The warmest month (with the highest average high temperature) is July (34.8°C).
The month with the lowest average high temperature is January (20.7°C).

  • Average low temperature in December: 9.1°C

The month with the highest average low temperature is August (22.5°C).
The coldest month (with the lowest average low temperature) is January (8.2°C).

Average humidity in December - Monterrey, Mexico
  • Average humidity in December: 69%

The month with the highest relative humidity is October (71%).
The month with the lowest relative humidity is March (58%).

Average rainfall in December - Monterrey, Mexico
  • Average rainfall in December: 14.1mm

The wettest month (with the highest rainfall) is September (150.6mm).
The driest month (with the lowest rainfall) is December (14.1mm).

Average rainfall days in December - Monterrey, Mexico
  • Average rainfall days in December: 3.4 days

The month with the highest number of rainy days is September (8.2 days).
Months with the lowest number of rainy days are March and December (3.4 days).

Average daylight in December / Average sunshine in December - Monterrey, Mexico
  • Average daylight in December: 10.6h

The month with the longest days is June (Average daylight: 13.7h).
The month with shortest days is December (Average daylight: 10.6h).

  • Average sunshine in December: 4.3h

The month with most sunshine is July (Average sunshine: 8h).
The month with least sunshine is December (Average sunshine: 4.3h).

Average UV index in December - Monterrey, Mexico
  • Average UV index in December: 5

Months with the highest UV index are May, June, July and August (UV index 12).
Months with the lowest UV index are January and December (UV index 5).

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