January Weather in Rosny-sous-Bois, France

Last updated: August 23, 2025

In January, the average temperature in Rosny-sous-Bois, France hovers around 4°C (40°F), with a minimum dipping to -8°C (18°F) and a maximum reaching 14°C (58°F). Expect 60 mm (2.3 in) of precipitation spread over 10 days, while the air remains notably moist with an average humidity of 91%.

January Temperature in Rosny-sous-Bois

In January in Rosny-sous-Bois, the average temperature is 4°C (40°F). Maximum temperatures can reach 14°C (58°F), while minimums can drop as low as -8°C (18°F). It’s advisable to pack warm clothing and be prepared for chilly weather if you plan to visit during this time.

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

The chart illustrates January 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, January typically has an average temperature of 4°C (40°F), with highs reaching up to 14°C (58°F) and lows dropping to around -8°C (18°F).

Data source: Temperature data for Rosny-sous-Bois generated using information from the Copernicus Climate Change Service.

January Precipitation in Rosny-sous-Bois

In Rosny-sous-Bois in January, the precipitation amount is 60 mm (2.3 in) over a span of 10 days.

January Precipitation Trends in Rosny-sous-Bois

The chart displays monthly precipitation patterns in Rosny-sous-Bois, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Rosny-sous-Bois, January typically receives around 60 mm (2.3 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Rosny-sous-Bois

In Rosny-sous-Bois in January, humidity is 91%. With an average temperature of 4°C (40°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor travel uncomfortable and necessitating extra layers for warmth.

January Average Humidity in Rosny-sous-Bois

This chart illustrates the average monthly humidity levels in Rosny-sous-Bois, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Rosny-sous-Bois is approximately 91%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Rosny-sous-Bois

In Rosny-sous-Bois in January, 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 Rosny-sous-Bois, you can visit Hourly UV Index in Rosny-sous-Bois.

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

The chart shows the monthly maximum UV Index (UVI) for Rosny-sous-Bois in January, 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 January, the maximum UV index in Rosny-sous-Bois typically reaches 2, which falls under the low exposure category.

Data source: Rosny-sous-Bois January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	60 mm (2.3 inches)	91%	low
February Weather	6°C (43°F)	68 mm (2.7 inches)	89%	moderate
March Weather	8°C (47°F)	73 mm (2.9 inches)	85%	moderate
April Weather	11°C (52°F)	31 mm (1.2 inches)	84%	high
May Weather	14°C (58°F)	72 mm (2.8 inches)	82%	very high
June Weather	19°C (66°F)	68 mm (2.7 inches)	80%	very high
July Weather	21°C (70°F)	52 mm (2.0 inches)	73%	very high
August Weather	20°C (68°F)	58 mm (2.3 inches)	68%	very high
September Weather	17°C (63°F)	51 mm (2.0 inches)	76%	high
October Weather	13°C (55°F)	81 mm (3.2 inches)	88%	moderate
November Weather	8°C (46°F)	66 mm (2.6 inches)	92%	low
December Weather	6°C (43°F)	106 mm (4.2 inches)	93%	low