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December Weather in Onis, Spain

Last updated: August 27, 2025

In December, the average temperature in Onis, Spain hovers around 6°C (43°F). Expect chilly days, with minimum temperatures dipping to -5°C (23°F) and highs reaching up to 17°C (62°F). During this time, 175 mm (6.9 in) of precipitation is typical, falling over approximately 17 days. With an average humidity of 87%, the air can feel quite damp, adding to the need for cozy layers!

December Temperature in Onis

In December in Onis, the average temperature is 6°C (43°F). The maximum can reach 17°C (62°F), while the minimum can drop as low as -5°C (23°F). Travelers should be prepared for a range of temperatures and pack accordingly for both mild and chilly weather conditions.

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

The chart illustrates December temperature patterns in Onis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onis, December typically has an average temperature of 6°C (43°F), with highs reaching up to 17°C (62°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec394344475358626259534542
Data source: Temperature data for Onis 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 Onis

In Onis in December, the precipitation amount is 175 mm (6.9 in) occurring over the course of 17 days.

December Precipitation Trends in Onis

The chart displays monthly precipitation patterns in Onis, 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 Onis, December typically receives around 175 mm (6.9 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec115114126128133160117105109119179175
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Onis

In Onis in December, humidity is 87%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and necessitating warm, breathable layers for traveling.

December Average Humidity in Onis

This chart illustrates the average monthly humidity levels in Onis, 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 Onis is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%83%83%84%84%86%78%77%82%86%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Onis

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

Maximum UV Index Levels in Onis for December

The chart shows the monthly maximum UV Index (UVI) for Onis 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 Onis typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24689111098532
Data source: Onis 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 Onis Compares to Other Months

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

This table compares monthly weather conditions in Onis, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)114 mm (4.5 inches)87%low
February Weather6°C (43°F)114 mm (4.5 inches)85%moderate
March Weather7°C (44°F)126 mm (5.0 inches)83%high
April Weather9°C (48°F)128 mm (5.0 inches)83%very high
May Weather12°C (53°F)133 mm (5.2 inches)84%very high
June Weather14°C (58°F)160 mm (6.3 inches)84%extreme
July Weather17°C (62°F)117 mm (4.6 inches)86%very high
August Weather17°C (62°F)105 mm (4.1 inches)78%very high
September Weather15°C (59°F)109 mm (4.3 inches)77%very high
October Weather12°C (53°F)119 mm (4.7 inches)82%moderate
November Weather7°C (45°F)179 mm (7.0 inches)86%moderate
December Weather6°C (43°F)175 mm (6.9 inches)87%low

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