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December Weather in Rosny-sous-Bois, France

Last updated: August 23, 2025

In Rosny-sous-Bois, France, the average temperature in December is a brisk 6°C (43°F). Expect chilly days with a minimum that can dip to -3°C (26°F) and a maximum reaching 15°C (60°F). Rain is a common visitor, with an average precipitation of 106 mm (4.2 in) spread over 17 days. Moreover, the air is quite damp, boasting an average humidity of 93%. Prepare accordingly!

December Temperature in Rosny-sous-Bois

In December in Rosny-sous-Bois, the average temperature is 6°C (43°F). Maximums can reach 15°C (60°F), and minimums can drop as low as -3°C (26°F). It's advisable to pack layers to stay comfortable while exploring the beautiful surroundings.

December Weather in Rosny-sous-Bois: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Rosny-sous-Bois, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rosny-sous-Bois, December typically has an average temperature of 6°C (43°F), with highs reaching up to 15°C (60°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec404347525866696862554643
Data source: Temperature data for Rosny-sous-Bois 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 Rosny-sous-Bois

In Rosny-sous-Bois in December, the precipitation amount is 106 mm (4.2 in) spread over 17 days.

December Precipitation Trends in Rosny-sous-Bois

The chart displays monthly precipitation patterns in Rosny-sous-Bois, 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 Rosny-sous-Bois, December typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec6069733172685258518166106
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rosny-sous-Bois

In Rosny-sous-Bois in December, humidity is 93%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making travel particularly uncomfortable and the air feel heavy, as though every step is met with resistance.

December Average Humidity in Rosny-sous-Bois

This chart illustrates the average monthly humidity levels in Rosny-sous-Bois, 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 Rosny-sous-Bois is approximately 93%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%82%80%73%68%76%88%92%93%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rosny-sous-Bois

In Rosny-sous-Bois in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Rosny-sous-Bois.

Maximum UV Index Levels in Rosny-sous-Bois for December

The chart shows the monthly maximum UV Index (UVI) for Rosny-sous-Bois 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 Rosny-sous-Bois typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689886421
Data source: Rosny-sous-Bois 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 Rosny-sous-Bois Compares to Other Months

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

This table compares monthly weather conditions in Rosny-sous-Bois, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)60 mm (2.3 inches)91%low
February Weather6°C (43°F)68 mm (2.7 inches)89%moderate
March Weather8°C (47°F)73 mm (2.9 inches)85%moderate
April Weather11°C (52°F)31 mm (1.2 inches)84%high
May Weather14°C (58°F)72 mm (2.8 inches)82%very high
June Weather19°C (66°F)68 mm (2.7 inches)80%very high
July Weather21°C (70°F)52 mm (2.0 inches)73%very high
August Weather20°C (68°F)58 mm (2.3 inches)68%very high
September Weather17°C (63°F)51 mm (2.0 inches)76%high
October Weather13°C (55°F)81 mm (3.2 inches)88%moderate
November Weather8°C (46°F)66 mm (2.6 inches)92%low
December Weather6°C (43°F)106 mm (4.2 inches)93%low

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