“In Brittany, the weather is nice several times a day.” This phrase that the Bretons hammer home every time you talk to them about the weather is a roundabout way of saying that it can also rain several times a day, especially in Brest. If we consider the large cities in the Météo-France network, the city of Finistère is in fact the city in mainland France where it rains most often (except for mountainous areas where rainfall is high). According to Météo-France, it rains 160 days out of 365 on average calculated over 30 years between 1991 and 2021.
More if we focus on the amount of rain that fell, Brest gives up its first place to Biarritz and becomes the second wettest city. On average, over a year, the Basque city records 1,470 mm of rain while the Finistère city 1,230 mm. Knowing that in Biarritz, it rains 19 days less than in Brest! A situation which can be explained by the rainy days in Finistère which sometimes take the form of drizzle, therefore fine and weak rains, while in the Basque country the rains are less frequent, but more sustained.
As for the temperature, Brest benefits from a relatively mild oceanic climate. The coldest temperature is only -5° recorded on January 12, 1987. The coolest morning: -14° on January 28, 1947. Values which remain infrequent, on average, there are only 14 days of frost per year in Brest. As for the heat record, it was recently: July 18, 2022 with 39.3°.
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France