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December Weather in Castellar del Riu, Spain

Last updated: August 27, 2025

In December, the average temperature in Castellar del Riu, Spain hovers around 5°C (42°F), with a minimum of -4°C (24°F) and a maximum reaching 17°C (63°F). This month sees an average precipitation of 31 mm (1.2 in) spread over approximately 5 days, contributing to an average humidity level of 79%.

December Temperature in Castellar del Riu

In December in Castellar del Riu, the average temperature is 5°C (42°F), with maximums reaching 17°C (63°F) and minimums dropping to as low as -4°C (24°F). Travelers should prepare for a mix of chilly and mild weather, making it ideal for layering clothing during outdoor activities.

December Weather in Castellar del Riu: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Castellar del Riu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castellar del Riu, December typically has an average temperature of 5°C (42°F), with highs reaching up to 17°C (63°F) and lows dropping to around -4°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec394448526067737264574641
Data source: Temperature data for Castellar del Riu 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 Castellar del Riu

In Castellar del Riu in December, the precipitation amount is 31 mm (1.2 in) spread over 5 days.

December Precipitation Trends in Castellar del Riu

The chart displays monthly precipitation patterns in Castellar del Riu, 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 Castellar del Riu, December typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec4660771141131075883861217731
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Castellar del Riu

In Castellar del Riu in December, humidity is 79%. With an average temperature of 5°C (42°F), this humidity feels like a chilly mist enveloping you, making outdoor activities challenging and travel less appealing, as the dampness clings to your skin and the cold bites through your layers.

December Average Humidity in Castellar del Riu

This chart illustrates the average monthly humidity levels in Castellar del Riu, 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 Castellar del Riu is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%74%71%69%66%65%64%64%68%77%79%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Castellar del Riu

In Castellar del Riu 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 Castellar del Riu, you can visit Hourly UV Index in Castellar del Riu.

Maximum UV Index Levels in Castellar del Riu for December

The chart shows the monthly maximum UV Index (UVI) for Castellar del Riu 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 Castellar del Riu typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098632
Data source: Castellar del Riu 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 Castellar del Riu Compares to Other Months

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

This table compares monthly weather conditions in Castellar del Riu, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)46 mm (1.8 inches)79%moderate
February Weather7°C (45°F)60 mm (2.4 inches)74%moderate
March Weather9°C (48°F)77 mm (3.0 inches)71%high
April Weather11°C (52°F)114 mm (4.5 inches)69%very high
May Weather16°C (60°F)113 mm (4.5 inches)66%very high
June Weather19°C (67°F)107 mm (4.2 inches)65%very high
July Weather23°C (73°F)58 mm (2.3 inches)64%very high
August Weather22°C (73°F)83 mm (3.3 inches)64%very high
September Weather18°C (65°F)86 mm (3.4 inches)68%very high
October Weather14°C (57°F)121 mm (4.8 inches)77%high
November Weather8°C (47°F)77 mm (3.0 inches)79%moderate
December Weather5°C (42°F)31 mm (1.2 inches)79%low

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