December Weather in Caldelas, Portugal

Last updated: August 27, 2025

In December, the average temperature in Caldelas, Portugal hovers around 9°C (49°F). Expect a chill, with minimums dipping to -1°C (30°F) and occasional highs reaching 19°C (66°F). The month features 273 mm (10.8 in) of precipitation spread over 17 days, contributing to an average humidity level of 87%. Prepare for a wonderfully moody climate!

December Temperature in Caldelas

In December in Caldelas, the average temperature is 9°C (49°F). Maximums can reach 19°C (66°F), while minimums can drop as low as -1°C (30°F). Be sure to pack layers for your trip, as the temperature can vary significantly throughout the day.

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

The chart illustrates December temperature patterns in Caldelas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Caldelas, December typically has an average temperature of 9°C (49°F), with highs reaching up to 19°C (66°F) and lows dropping to around -1°C (30°F).

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

December Precipitation in Caldelas

In Caldelas in December, the total precipitation amount is 273 mm (10.8 in) over the course of 17 days.

December Precipitation Trends in Caldelas

The chart displays monthly precipitation patterns in Caldelas, 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 Caldelas, December typically receives around 273 mm (10.8 inches) of precipitation spread over approximately 17 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 Caldelas

In Caldelas in December humidity is 87%. With an average temperature of 9°C (49°F), this humidity feels like a damp blanket wrapping around you, making travel uncomfortable and leaving you yearning for a dry breeze to refresh your spirit.

December Average Humidity in Caldelas

This chart illustrates the average monthly humidity levels in Caldelas, 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 Caldelas is approximately 87%, 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 Caldelas

In Caldelas in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Caldelas, you can visit Hourly UV Index in Caldelas.

Maximum UV Index Levels in Caldelas for December

The chart shows the monthly maximum UV Index (UVI) for Caldelas 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 Caldelas typically reaches 2, which falls under the low exposure category.

Data source: Caldelas 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 Caldelas Compares to Other Months

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

This table compares monthly weather conditions in Caldelas, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (46°F)	147 mm (5.8 inches)	87%	low
February Weather	10°C (50°F)	209 mm (8.2 inches)	81%	moderate
March Weather	11°C (51°F)	205 mm (8.1 inches)	78%	high
April Weather	13°C (55°F)	179 mm (7.0 inches)	79%	very high
May Weather	16°C (61°F)	119 mm (4.7 inches)	78%	very high
June Weather	17°C (64°F)	70 mm (2.8 inches)	71%	extreme
July Weather	20°C (68°F)	34 mm (1.3 inches)	63%	very high
August Weather	20°C (68°F)	34 mm (1.4 inches)	64%	very high
September Weather	19°C (66°F)	59 mm (2.3 inches)	71%	very high
October Weather	15°C (59°F)	166 mm (6.5 inches)	79%	high
November Weather	11°C (52°F)	228 mm (9.0 inches)	86%	moderate
December Weather	9°C (49°F)	273 mm (10.8 inches)	87%	low