The three days of 11,12 and 13 May are popularly known as the Saints de Glace, traditionally the last risks of frost. St Mamert, St Pancrace and St Servais (French names) always have their saint's day on these dates and often there are colder interludes. This year the Meteo expects no frost (certainly in our part of France), but it does look like it will be wet and mild - indeed storms are not unlikely.
Of course professional weather forecasters point out that it is not definite that there will be no frost below 500 metres, but there has been no frost recorded in the last 7 years.
comments to email@example.com