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December Weather in Castelnou, Spain

Last updated: August 27, 2025

In December, the average temperature in Castelnou, Spain hovers around 9°C (49°F), with a minimum dipping to -4°C (25°F) and a maximum reaching 21°C (70°F). Expect about 25 mm (1.0 in) of precipitation spread over 5 days, and enjoy the high humidity at an average of 84%. 🌧️

December Temperature in Castelnou

In December, in Castelnou, the average temperature is 9°C (49°F), with maximums that can reach 21°C (70°F) and minimums that can drop to as low as -4°C (25°F). This temperature variation makes Castelnou a great destination for travelers seeking a mix of mild days and cooler nights.

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

The chart illustrates December temperature patterns in Castelnou, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castelnou, December typically has an average temperature of 9°C (49°F), with highs reaching up to 21°C (70°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec455154586875818072635348
Data source: Temperature data for Castelnou 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 Castelnou

In Castelnou in December, the total precipitation amount is 25 mm (1.0 in) over a span of 5 days.

December Precipitation Trends in Castelnou

The chart displays monthly precipitation patterns in Castelnou, 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 Castelnou, December typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec381629603429121321365025
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Castelnou

In Castelnou in December, humidity is 84%. With an average temperature of 9°C (49°F), this humidity feels like a chilly embrace, making travel uncomfortable as the dampness seeps into your clothes and lingers in the air, leaving you feeling cool yet clammy.

December Average Humidity in Castelnou

This chart illustrates the average monthly humidity levels in Castelnou, 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 Castelnou is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%80%73%69%64%59%58%58%64%76%82%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Castelnou

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

Maximum UV Index Levels in Castelnou for December

The chart shows the monthly maximum UV Index (UVI) for Castelnou 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 Castelnou typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689111198642
Data source: Castelnou 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 Castelnou Compares to Other Months

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

This table compares monthly weather conditions in Castelnou, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (46°F)38 mm (1.5 inches)85%moderate
February Weather11°C (51°F)16 mm (0.6 inches)80%moderate
March Weather12°C (55°F)29 mm (1.1 inches)73%high
April Weather15°C (59°F)60 mm (2.4 inches)69%very high
May Weather20°C (68°F)34 mm (1.3 inches)64%very high
June Weather24°C (76°F)28 mm (1.1 inches)59%extreme
July Weather27°C (81°F)12 mm (0.5 inches)58%extreme
August Weather27°C (81°F)13 mm (0.5 inches)58%very high
September Weather22°C (73°F)21 mm (0.8 inches)64%very high
October Weather17°C (63°F)36 mm (1.4 inches)76%high
November Weather11°C (53°F)50 mm (2.0 inches)82%moderate
December Weather9°C (49°F)25 mm (1.0 inches)84%low

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