Climate averages 1991–2020
Rennes weather
in December.
A cool, moderately wet month: the 11th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Rennes: daytime highs average 8.8°C and nights cool to about 3.7°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 71 mm of rain on roughly 12 days, which makes December a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 8 h 27 min on an average December day.
The nearest other city in this atlas is Nantes (100 km away). In December its highs average 9.3°C, 0.5°C warmer than Rennes, with 79 mm of rain.
Among the 57 cities listed in France, Rennes ranks 19th of 57 for the warmest December highs and joint 23rd of 57 for the driest December (rainfall, lowest first). The mean December high of those 57 cities is 8.5°C; Rennes is 0.3°C warmer than that mean.
From December to January, average highs fall by 0.4°C to 8.4°C, and monthly rainfall falls from 71 mm to 64 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Rennes climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.4°C3.3°C | 3.3°C | 64 | 11.2 | 8.89 h |
| February | 9.4°C2.9°C | 2.9°C | 53 | 9.9 | 10.210 h |
| March | 12.2°C4.6°C | 4.6°C | 52 | 10.5 | 11.912 h |
| April | 14.9°C6.3°C | 6.3°C | 58 | 11.1 | 13.614 h |
| May | 18.1°C9.5°C | 9.5°C | 63 | 10.8 | 15.215 h |
| June | 21.2°C12.4°C | 12.4°C | 53 | 9.0 | 16.016 h |
| July | 23.1°C14.2°C | 14.2°C | 46 | 7.8 | 15.616 h |
| August | 23.2°C14.3°C | 14.3°C | 46 | 8.2 | 14.314 h |
| September | 20.5°C12.2°C | 12.2°C | 49 | 8.2 | 12.613 h |
| October | 16.3°C9.7°C | 9.7°C | 69 | 11.4 | 10.911 h |
| November | 11.8°C6.2°C | 6.2°C | 65 | 11.3 | 9.39 h |
| December, selected | 8.8°C3.7°C | 3.7°C | 71 | 12.1 | 8.48 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Nantes in DecemberFrance · 100 kmHigh 9.3°C · Low 4.3°C · 79 mm rain
- Angers in DecemberFrance · 110 kmHigh 8.7°C · Low 3.6°C · 70 mm rain
- Saint Helier in DecemberJersey · 124 kmHigh 10.0°C · Low 7.7°C · 138 mm rain
- Le Mans in DecemberFrance · 140 kmHigh 8.0°C · Low 2.9°C · 72 mm rain
- Caen in DecemberFrance · 154 kmHigh 8.5°C · Low 4.0°C · 74 mm rain
- Tours in DecemberFrance · 195 kmHigh 8.4°C · Low 3.3°C · 71 mm rain
- Le Havre in DecemberFrance · 202 kmHigh 8.5°C · Low 4.8°C · 121 mm rain
- Brest, France in DecemberFrance · 210 kmHigh 10.4°C · Low 7.4°C · 105 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Rennes) is explained once on the Rennes year overview and on the Sources, method and limits page.