Spring frosts followed by summer heatwaves have taken their toll on French vineyards.
New record was measured in southern town of Gallargues-le-Montueux - the previous record was 44.1C during deadly 2003 heatwave.
The French agriculture ministry estimates that the country's total wine production this year will fall to about 36.9 million hectolitres, or 4.9 billion bottles, down by almost 20 percent on last year due essentially to spring frosts and summer storms, with the Bordeaux region worst-affected.
Major congestion was predicted as holiday departures reached a peak at the weekend, while much of the country was hit by violent storms.
Snow brings travel chaos, with three soldiers travelling to join colleagues departing for the French military operation in Mali killed in road accident.