December Weather in Alter do Chao, Portugal

Last updated: August 27, 2025

In Alter do Chao, Portugal, the average temperature in December hovers around 11°C (52°F), with a minimum dipping to -1°C (30°F) and a maximum reaching 19°C (67°F). Expect 73 mm (2.9 in) of precipitation over approximately 8 days, accompanied by a high average humidity of 85%. Whether you're braving the chill or enjoying the mild warmth, be prepared for a cozy experience!

December Temperature in Alter do Chao

In December in Alter do Chao, the average temperature is 11°C (52°F), with maximums reaching 19°C (67°F) and minimums dropping as low as -1°C (30°F). This temperature range makes it essential for travelers to pack layers and prepare for varying weather conditions.

December Weather in Alter do Chao: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Alter do Chao, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alter do Chao, December typically has an average temperature of 11°C (52°F), with highs reaching up to 19°C (67°F) and lows dropping to around -1°C (30°F).

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

December Precipitation in Alter do Chao

In Alter do Chao in December, the precipitation amount is 73 mm (2.9 in) over a span of 8 days.

December Precipitation Trends in Alter do Chao

The chart displays monthly precipitation patterns in Alter do Chao, 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 Alter do Chao, December typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 8 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 Alter do Chao

In Alter do Chao in December, humidity is 85%. With an average temperature of 11°C (52°F), this humidity feels like a damp blanket wrapping around you, making travel quite uncomfortable as the air feels heavy and can sap your energy.

December Average Humidity in Alter do Chao

This chart illustrates the average monthly humidity levels in Alter do Chao, 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 Alter do Chao is approximately 85%, 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 Alter do Chao

In Alter do Chao in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Alter do Chao, you can check the information here.

Maximum UV Index Levels in Alter do Chao for December

The chart shows the monthly maximum UV Index (UVI) for Alter do Chao 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 Alter do Chao typically reaches 3, which falls under the moderate exposure category.

Data source: Alter do Chao 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 Alter do Chao Compares to Other Months

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

This table compares monthly weather conditions in Alter do Chao, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	40 mm (1.6 inches)	85%	moderate
February Weather	11°C (53°F)	52 mm (2.0 inches)	75%	moderate
March Weather	13°C (55°F)	92 mm (3.6 inches)	72%	high
April Weather	15°C (59°F)	84 mm (3.3 inches)	70%	very high
May Weather	19°C (66°F)	37 mm (1.4 inches)	70%	very high
June Weather	21°C (70°F)	14 mm (0.6 inches)	63%	extreme
July Weather	24°C (75°F)	4 mm (0.2 inches)	60%	very high
August Weather	24°C (76°F)	5 mm (0.2 inches)	60%	very high
September Weather	22°C (73°F)	29 mm (1.1 inches)	67%	very high
October Weather	18°C (65°F)	52 mm (2.1 inches)	74%	high
November Weather	13°C (55°F)	80 mm (3.2 inches)	83%	moderate
December Weather	11°C (52°F)	73 mm (2.9 inches)	85%	moderate