December Weather in Rosario, Mexico

Last updated: August 26, 2025

In December, the average temperature in Rosario, Mexico is a pleasant 20°C (68°F). Expect variations, with a minimum of 8°C (47°F) and a maximum of 30°C (87°F). During this time, precipitation is typically around 45 mm (1.8 in) spread over 7 days, contributing to an average humidity of 88%. Enjoy the mild and moist climate!

December Temperature in Rosario

In December in Rosario, the average temperature is 20°C (68°F). Maximums can reach 30°C (87°F), while minimums can drop as low as 8°C (47°F). This mild climate makes it an ideal destination for travelers looking to enjoy pleasant outdoor activities.

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

The chart illustrates December temperature patterns in Rosario, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rosario, December typically has an average temperature of 20°C (68°F), with highs reaching up to 30°C (87°F) and lows dropping to around 8°C (47°F).

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

December Precipitation in Rosario

In Rosario in December, the precipitation amount is 45 mm (1.8 in) spread over a duration of 7 days.

December Precipitation Trends in Rosario

The chart displays monthly precipitation patterns in Rosario, 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 Rosario, December typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 7 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 Rosario

In Rosario in December humidity is 88%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making every step feel heavier and every breath a bit more labored, which can be quite draining for traveling.

December Average Humidity in Rosario

This chart illustrates the average monthly humidity levels in Rosario, 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 Rosario is approximately 88%, 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 Rosario

In Rosario in December, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Rosario.

Maximum UV Index Levels in Rosario for December

The chart shows the monthly maximum UV Index (UVI) for Rosario 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 Rosario typically reaches 9, which falls under the very high exposure category.

Data source: Rosario 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 Rosario Compares to Other Months

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

This table compares monthly weather conditions in Rosario, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	19°C (67°F)	38 mm (1.5 inches)	83%	very high
February Weather	21°C (70°F)	24 mm (0.9 inches)	76%	extreme
March Weather	22°C (72°F)	27 mm (1.0 inches)	66%	extreme
April Weather	24°C (76°F)	34 mm (1.4 inches)	59%	extreme
May Weather	25°C (78°F)	91 mm (3.6 inches)	64%	extreme
June Weather	24°C (76°F)	229 mm (9.0 inches)	69%	extreme
July Weather	24°C (75°F)	124 mm (4.9 inches)	82%	extreme
August Weather	24°C (75°F)	157 mm (6.2 inches)	87%	extreme
September Weather	24°C (75°F)	212 mm (8.4 inches)	87%	extreme
October Weather	23°C (73°F)	203 mm (8.0 inches)	88%	extreme
November Weather	21°C (70°F)	71 mm (2.8 inches)	88%	very high
December Weather	20°C (68°F)	45 mm (1.8 inches)	88%	very high