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December Weather in Rosario, Mexico

Last updated: August 27, 2025

In December, the average temperature in Rosario, Mexico is a pleasant 17°C (62°F). You can expect a range of temperatures, with a minimum dipping to 0°C (33°F) and a maximum soaring to 31°C (88°F). During this month, precipitation amounts to 33 mm (1.3 in) over approximately 3 days, contributing to an average humidity level of 80%.

December Temperature in Rosario

In December in Rosario, the average temperature is 17°C (62°F). Maximums can reach 31°C (88°F) and minimums can be as low as 0°C (33°F). It's a great time to explore Rosario, so be prepared for both warm days and cooler evenings!

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 17°C (62°F), with highs reaching up to 31°C (88°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec616368758086828280787062
Data source: Temperature data for Rosario generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Rosario

In Rosario in December, the precipitation amount is 33 mm (1.3 in) over the course of 3 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 33 mm (1.3 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec272318113313512492254233
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rosario

In Rosario in December, humidity is 80%. With an average temperature of 17°C (62°F), this humidity feels like a heavy blanket wrapping around you, making travel sticky and uncomfortable, and often leaving you longing for a refreshing breeze.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%67%60%51%47%50%70%82%82%78%78%81%
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 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 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 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810121212121211975
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.
 TemperaturePrecipitationHumidityUV
January Weather16°C (61°F)27 mm (1.1 inches)74%high
February Weather17°C (63°F)23 mm (0.9 inches)67%very high
March Weather20°C (68°F)18 mm (0.7 inches)60%very high
April Weather24°C (75°F)1 mm (0.0 inches)51%extreme
May Weather27°C (80°F)1 mm (0.0 inches)47%extreme
June Weather30°C (86°F)33 mm (1.3 inches)50%extreme
July Weather28°C (83°F)135 mm (5.3 inches)70%extreme
August Weather28°C (82°F)124 mm (4.9 inches)81%extreme
September Weather27°C (81°F)92 mm (3.6 inches)82%extreme
October Weather25°C (78°F)25 mm (1.0 inches)78%very high
November Weather21°C (70°F)41 mm (1.6 inches)78%high
December Weather17°C (62°F)33 mm (1.3 inches)80%moderate

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