The thermometer has been playing yoyo lately, and is not about to stop. Indeed, the weather forecast for the next few days goes from one extreme to the other. This Tuesday, we will thus see a notorious blow of fresh air, with clearly negative temperatures over a large part of the metropolitan territory. It will also be necessary to be very careful when taking the road in certain departments: light frosts are expected.

From Wednesday, however, we will see very mild temperatures. The thermometer will be well above 25°C, equivalent to the heat threshold, in places. The meteorological phenomena at the origin of these relative extremes of temperature are diverse, but will follow one another without transition.

The cause of the cold peak at the start of the week is an anticyclonic ridge, which will particularly cause temperatures to drop between the Grand-Est, Bourgogne-Franche-Comté and Auvergne-Rhône-Alpes. Overnight Monday through Tuesday, skies will clear overnight, leaving the door open to near-winter temperatures. The western regions will be mostly spared by this cold wave, thanks to the blowing of a relatively moderate north-westerly wind, as reported by La Chaîne Météo.

Wednesday will see a very strong thermal amplitude between morning and afternoon. A southern sector flow will set in and cause the thermometer to rise, with the help of the foehn in certain departments. Find below the 34 departments in which it will be hot this Wednesday.