Since 2013, winters in France have become milder, says La Chaîne Météo. Two factors explain this phenomenon: global warming and the northward movement of subtropical anticyclones.
In winter, de facto, this phenomenon “pushes disturbances towards the north, and is accompanied by mild air” “Tug of war between cold air and mild air,” says the specialized site. The first half of February recorded the heat record for "the mildest firsthalf of February ever recorded since records began"