December Weather in Gaztelu, Spain

Last updated: August 27, 2025

In December, the average temperature in Gaztelu, Spain is a chilly 6°C (44°F). Expect minimums dipping to -7°C (19°F) and highs reaching 17°C (63°F). With an average humidity of 87%, you'll want to prepare for potential rain, as 156 mm (6.1 in) of precipitation can be expected over about 15 days this month. Stay warm and dry during your visit!

December Temperature in Gaztelu

In December in Gaztelu, the average temperature is 6°C (44°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -7°C (19°F). Travelers should prepare for a range of weather conditions, from mild afternoons to chilly evenings.

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

The chart illustrates December temperature patterns in Gaztelu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gaztelu, December typically has an average temperature of 6°C (44°F), with highs reaching up to 17°C (63°F) and lows dropping to around -7°C (19°F).

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

December Precipitation in Gaztelu

In Gaztelu in December, the total precipitation amount is 156 mm (6.1 in) distributed over 15 days.

December Precipitation Trends in Gaztelu

The chart displays monthly precipitation patterns in Gaztelu, 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 Gaztelu, December typically receives around 156 mm (6.1 inches) of precipitation spread over approximately 15 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 Gaztelu

In Gaztelu in December humidity is 87%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable without proper layers and preparation.

December Average Humidity in Gaztelu

This chart illustrates the average monthly humidity levels in Gaztelu, 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 Gaztelu 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 Gaztelu

In Gaztelu 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 Gaztelu, you can visit Hourly UV Index in Gaztelu.

Maximum UV Index Levels in Gaztelu for December

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

Data source: Gaztelu 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 Gaztelu Compares to Other Months

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

This table compares monthly weather conditions in Gaztelu, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	115 mm (4.5 inches)	86%	low
February Weather	7°C (45°F)	103 mm (4.0 inches)	85%	moderate
March Weather	8°C (47°F)	113 mm (4.4 inches)	82%	high
April Weather	10°C (51°F)	109 mm (4.3 inches)	81%	high
May Weather	13°C (56°F)	109 mm (4.3 inches)	80%	very high
June Weather	17°C (62°F)	133 mm (5.2 inches)	81%	very high
July Weather	18°C (65°F)	73 mm (2.9 inches)	80%	very high
August Weather	19°C (66°F)	80 mm (3.1 inches)	76%	very high
September Weather	17°C (62°F)	71 mm (2.8 inches)	75%	high
October Weather	13°C (55°F)	112 mm (4.4 inches)	81%	moderate
November Weather	8°C (47°F)	138 mm (5.4 inches)	85%	moderate
December Weather	6°C (44°F)	156 mm (6.1 inches)	87%	low