The keraunic level is the number of days per year when thunder has been heard in a defined area. The French departments have been separated in 2 categories: Keraunic level less or equal to 25, and keraunic level over 25.
The keraunic level is the number of days per year when thunder has been heard in a defined area. The French departments have been separated in 2 categories: Keraunic level less or equal to 25, and keraunic level over 25.