December weather forecast and climate
Rennes, France

Weather in December

The first month of the winter, December, is still a chilly month in Rennes, France, with average temperature varying between 4.2°C (39.6°F) and 9.1°C (48.4°F).

Temperature

In December, the average high-temperature is practically the same as in November - a chilly 9.1°C (48.4°F). In Rennes, the average low-temperature is 4.2°C (39.6°F).

Humidity

December is the most humid month, with an average relative humidity of 88%.

Rainfall

In December, the rain falls for 12.2 days. Throughout December, 34mm (1.34") of precipitation is accumulated. Throughout the year, in Rennes, there are 150.1 rainfall days, and 330mm (12.99") of precipitation is accumulated.

Snowfall

Months with snowfall in Rennes are January through April, November and December. Months with the most snowfall in Rennes are February through April and December, with an average 2mm (0.08") of accumulated snow.

Daylight

With an average of 8.5h of daylight, December has the shortest days of the year in Rennes.

Sunshine

The average sunshine in Rennes, France, is 4.6h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Rennes. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the most humid month in Rennes?

With an average relative humidity of 88%, December is the most humid month in Rennes.

What is the average humidity in December in Rennes?

In Rennes, the average relative humidity in December is 88%.

How much does it rain in Rennes in December?

In Rennes, in December, during 12.2 rainfall days, 34mm (1.34") of precipitation is typically accumulated.

When does it snow the most in Rennes?

Months with the most snowfall in Rennes, France, are February through April and December, with an average 2mm (0.08") of accumulated snow.

How much does it snow in Rennes in December?

In December, it is snowing for 0.5 days. Throughout December, 2mm (0.08") of snow is accumulated.

What is the month with the shortest days in Rennes?

December has the shortest days of the year, with an average of 8.5h of daylight.

What is the average length of the day in December in Rennes?

The average length of the day in December is 8.5h.

How long on average sun shines in December in Rennes?

In December, the average sunshine in Rennes is 4.6h.

When is the lowest UV index in Rennes?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in December in Rennes?

In Rennes, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in December
Rennes, France

Average temperature in December - Rennes, France
  • Average high temperature in December: 9.1°C

The warmest month (with the highest average high temperature) is August (23.1°C).
The month with the lowest average high temperature is January (8.4°C).

  • Average low temperature in December: 4.2°C

The month with the highest average low temperature is July (12.8°C).
The coldest month (with the lowest average low temperature) is February (2.3°C).

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Average pressure in December
Rennes, France

Average pressure in December - Rennes, France
  • Average pressure in December: 1018.4mbar

The month with the highest atmospheric pressure is December (1018.4mbar).
The month with the lowest atmospheric pressure is November (1012.9mbar).

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Average wind speed in December
Rennes, France

Average wind speed in December - Rennes, France
  • Average wind speed in December: 16.8km/h

The windiest month (with the highest average wind speed) is February (17.6km/h).
The calmest month (with the lowest average wind speed) is August (11.7km/h).

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Average humidity in December
Rennes, France

Average humidity in December - Rennes, France
  • Average humidity in December: 88%

The month with the highest relative humidity is December (88%).
Months with the lowest relative humidity are July, August and September (78%).

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Average rainfall in December
Rennes, France

Average rainfall in December - Rennes, France
  • Average rainfall in December: 34mm

The wettest month (with the highest rainfall) is June (39mm).
The driest month (with the least rainfall) is September (12mm).

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Average rainfall days in December
Rennes, France

Average rainfall days in December - Rennes, France
  • Average rainfall days in December: 12.2 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is September (8.4 days).

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Average snowfall in December
Rennes, France

Average snowfall in December - Rennes, France
  • Average snowfall in December: 2mm

Months with the highest snowfall are February, March, April and December (2mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in December
Rennes, France

Average snowfall days in December - Rennes, France
  • Average snowfall days in December: 0.5 days

The month with the highest number of snowfall days is February (0.8 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Rennes, France

Average daylight in December / Average sunshine in December - Rennes, France
  • Average daylight in December: 8.5h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in December: 4.6h

The month with the most sunshine is July (Average sunshine: 9.7h).
The month with the least sunshine is January (Average sunshine: 4.2h).

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Average sunshine days in December
Rennes, France

Average sunshine days in December - Rennes, France
  • Average sunshine days in December: 15.9 days

The month with the most sunshine days is September (18.5 days).
The month with the least sunshine days is May (12.1 days).

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Average UV index in December
Rennes, France

Average UV index in December - Rennes, France
  • Average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Rennes, France

Average cloud cover in December - Rennes, France
  • Average cloud cover in December: 55

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 41).

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Average visibility in December
Rennes, France

Average visibility in December - Rennes, France
  • Average visibility in December: 9km

Months with the highest visibility are January, February, March, April, June, July, October, November and December (9km).
Months with the lowest visibility are May, August and September (8km).

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