December Weather in Castelli, Argentina

Last updated: August 22, 2025

In Castelli, Argentina, the average temperature in December sits comfortably at 21°C (70°F). However, temperatures can vary significantly, with minimums dipping to 6°C (43°F) and maximums soaring to 37°C (98°F). Expect around 90 mm (3.6 in) of precipitation spread over 9 days, and enjoy a pleasant average humidity level of 61%.

December Temperature in Castelli

In December in Castelli, the average temperature is 21°C (70°F). The maximum can reach 37°C (98°F), while the minimum can drop to as low as 6°C (43°F). Visitors should prepare for a range of temperatures, ensuring they pack both light clothing for warmer days and warmer layers for cooler evenings.

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

The chart illustrates December temperature patterns in Castelli, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castelli, December typically has an average temperature of 21°C (70°F), with highs reaching up to 37°C (98°F) and lows dropping to around 6°C (43°F).

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

December Precipitation in Castelli

In Castelli in December, the precipitation amount is 90 mm (3.6 in) spread over the course of 9 days.

December Precipitation Trends in Castelli

The chart displays monthly precipitation patterns in Castelli, 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 Castelli, December typically receives around 90 mm (3.6 inches) of precipitation spread over approximately 9 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 Castelli

In Castelli in December humidity is 61%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can leave travelers feeling a bit sticky, but with the right clothing and hydration, exploring the sights can still be quite enjoyable.

December Average Humidity in Castelli

This chart illustrates the average monthly humidity levels in Castelli, 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 Castelli is approximately 61%, 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 Castelli

In Castelli in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Castelli, you can check here.

Maximum UV Index Levels in Castelli for December

The chart shows the monthly maximum UV Index (UVI) for Castelli 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 Castelli typically reaches 14, which falls under the extreme exposure category.

Data source: Castelli 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 Castelli Compares to Other Months

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

This table compares monthly weather conditions in Castelli, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	23°C (74°F)	60 mm (2.4 inches)	59%	extreme
February Weather	22°C (72°F)	65 mm (2.6 inches)	70%	extreme
March Weather	20°C (68°F)	89 mm (3.5 inches)	72%	extreme
April Weather	17°C (64°F)	89 mm (3.5 inches)	82%	high
May Weather	13°C (56°F)	51 mm (2.0 inches)	86%	moderate
June Weather	11°C (51°F)	63 mm (2.5 inches)	81%	moderate
July Weather	10°C (49°F)	60 mm (2.4 inches)	73%	moderate
August Weather	11°C (52°F)	47 mm (1.9 inches)	69%	moderate
September Weather	13°C (56°F)	74 mm (2.9 inches)	76%	high
October Weather	15°C (60°F)	61 mm (2.4 inches)	69%	very high
November Weather	19°C (66°F)	65 mm (2.6 inches)	66%	extreme
December Weather	21°C (70°F)	90 mm (3.6 inches)	61%	extreme