December Weather in Altar, Mexico

Last updated: August 27, 2025

The average temperature in Altar, Mexico during December is a comfortable 15°C (58°F). Expect a minimum of 0°C (32°F) and a maximum of 30°C (85°F). During this time, the region typically sees 17 mm (0.7 in) of precipitation spread over 3 days, with an average humidity of 81%.

December Temperature in Altar

In December in Altar, the average temperature is 15°C (58°F). Maximums can reach 30°C (85°F) and minimums can be as low as 0°C (32°F). This makes it an ideal time for travelers to enjoy a mix of mild and warm weather, perfect for outdoor activities.

December Weather in Altar: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Altar, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altar, December typically has an average temperature of 15°C (58°F), with highs reaching up to 30°C (85°F) and lows dropping to around 0°C (32°F).

Data source: Temperature data for Altar generated using information from the Copernicus Climate Change Service.

December Precipitation in Altar

In Altar in December, the precipitation amount is 17 mm (0.7 in) over the course of 3 days.

December Precipitation Trends in Altar

The chart displays monthly precipitation patterns in Altar, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Altar, December typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Altar

In Altar in December humidity is 81%. With an average temperature of 15°C (58°F), this humidity feels like a mild, damp embrace that can make outdoor activities feel heavy and exhausting, requiring frequent breaks in the shade or a cool beverage to refresh yourself.

December Average Humidity in Altar

This chart illustrates the average monthly humidity levels in Altar, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Altar is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Altar

In Altar in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Altar.

Maximum UV Index Levels in Altar for December

The chart shows the monthly maximum UV Index (UVI) for Altar in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Altar typically reaches 5, which falls under the moderate exposure category.

Data source: Altar December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Altar Compares to Other Months

Weather in Altar varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Altar, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Altar, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	14°C (57°F)	22 mm (0.9 inches)	74%	moderate
February Weather	15°C (59°F)	26 mm (1.0 inches)	71%	high
March Weather	18°C (65°F)	14 mm (0.6 inches)	60%	very high
April Weather	23°C (74°F)	2 mm (0.1 inches)	43%	extreme
May Weather	26°C (79°F)	2 mm (0.1 inches)	32%	extreme
June Weather	32°C (89°F)	3 mm (0.1 inches)	28%	extreme
July Weather	32°C (90°F)	43 mm (1.7 inches)	38%	extreme
August Weather	32°C (90°F)	38 mm (1.5 inches)	60%	extreme
September Weather	30°C (86°F)	41 mm (1.6 inches)	72%	extreme
October Weather	25°C (77°F)	9 mm (0.3 inches)	66%	very high
November Weather	20°C (68°F)	19 mm (0.8 inches)	74%	high
December Weather	15°C (58°F)	17 mm (0.7 inches)	81%	moderate