Colors of the following climate diagrams: Brittany Basse-Normandy
Daily maximum temperatures
The highest daytime temperatures in Basse-Normandy are reached in July with an average of 22.8 °C. The coldest month, on the other hand, is January, with an average of just 8.5 °C. In Brittany, July is the warmest month, with 22.9 °C. There, it is coolest in January with an average of 9.7 °C.
Night time lows
At night, it cools down to varying degrees depending on the country and altitude. In Basse-Normandy, temperatures drop as low as 3.2 °C in February. The warmest nights are in August at 13.7 °C. In Brittany, it is coolest at night in February at 4.2 °C and warmest in July at 14.3 °C. This corresponds to a cooling of 4.9 to 9.2 °C in Basse-Normandy and 5.1 to 8.6 °C in Brittany.
Rain days per month
By definition, a rain day is a day on which at least 0.1 liters of precipitation per m² fall. This corresponds to a 1 square meter puddle in which the water stands 0.1 mm high — insofar as the water does not seep away or evaporate. So it does not have to rain all day long. December brings the most rainy days (13.6) in Basse-Normandy. With an average of only 7.1 days, September is the friendliest. In Brittany, it rains most often in January with 14.8 days.
Precipitation amount per day
Depending on the season and the location of a country, the wind brings a varying amount of water with it. As a rule, the water evaporating in the oceans is absorbed and then transported inland. The greatest amount of rain (hail or dew are also forms of precipitation) in Basse-Normandy occurs in December, when about 2.9 liters per square meter fall per day. In Brittany, the average amount of precipitation ranges from 1.6 liters per day in September to 3.3 in December. However, these are average values. If you consider that there are only 14.3 rainy days in Brittany in December, each of them accounts for about 6.9 liters.
Sunshine hours per day
With 1,862 hours of sunshine per year, Basse-Normandy is in the lead. The most hours of sunshine (7.5 per day) are in July. Brittany falls into second place with only 1,825 hours. There the sun is visible in January for only 2.2 hours per day, so not hidden behind clouds.
Hours of daylight
The length of a day varies throughout the year and depends on the distance from the equator. In December, the day in Basse-Normandy is only 8.4 hours long. In June, on the other hand, it is 16.2 hours. In Brittany, it is 8.5 hours in December and 16.0 in June.