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December Weather in Ayer, Switzerland

Last updated: August 27, 2025

In Ayer, Switzerland, the average temperature in December hovers around -8°C (18°F). However, temperatures can vary dramatically, with a minimum plunge of -30°C (-22°F) and a maximum reaching up to 7°C (45°F). Expect a significant amount of precipitation, averaging 188 mm (7.4 in) over 16 days, contributing to a notably high average humidity level of 91%.

December Temperature in Ayer

In December in Ayer, the average temperature is -8°C (18°F). The maximum can reach 7°C (45°F), and the minimum can be as low as -30°C (-22°F). Be sure to pack warm clothing and prepare for a range of cold weather conditions while traveling to Ayer this month.

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

The chart illustrates December temperature patterns in Ayer, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ayer, December typically has an average temperature of -8°C (18°F), with highs reaching up to 7°C (45°F) and lows dropping to around -30°C (-22°F).
JanFebMarAprMayJunJulAugSepOctNovDec162329374353565649412918
Data source: Temperature data for Ayer 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 Ayer

In Ayer in December, the total precipitation amount is 188 mm (7.4 in), observed over a span of 16 days.

December Precipitation Trends in Ayer

The chart displays monthly precipitation patterns in Ayer, 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 Ayer, December typically receives around 188 mm (7.4 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec13596122811601301211299013598188
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Ayer

In Ayer in December humidity is 91%. With an average temperature of -8°C (18°F), this humidity feels like an icy blanket that clings to your skin, making every step feel heavier as you navigate the frigid air while wrapped in layers, leaving you longing for warmth.

December Average Humidity in Ayer

This chart illustrates the average monthly humidity levels in Ayer, 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 Ayer is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%87%84%80%82%82%77%81%89%89%91%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Ayer

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

Maximum UV Index Levels in Ayer for December

The chart shows the monthly maximum UV Index (UVI) for Ayer 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 Ayer typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec347810111097632
Data source: Ayer 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 Ayer Compares to Other Months

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

This table compares monthly weather conditions in Ayer, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)135 mm (5.3 inches)91%moderate
February Weather-5°C (23°F)95 mm (3.8 inches)89%moderate
March Weather-2°C (29°F)122 mm (4.8 inches)87%high
April Weather3°C (37°F)81 mm (3.2 inches)84%very high
May Weather6°C (43°F)160 mm (6.3 inches)80%very high
June Weather12°C (53°F)130 mm (5.1 inches)82%extreme
July Weather14°C (57°F)121 mm (4.8 inches)82%very high
August Weather13°C (56°F)129 mm (5.1 inches)77%very high
September Weather9°C (49°F)90 mm (3.6 inches)81%high
October Weather5°C (41°F)135 mm (5.3 inches)89%high
November Weather-2°C (29°F)98 mm (3.8 inches)89%moderate
December Weather-8°C (18°F)188 mm (7.4 inches)91%low

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