“What is not normal is to have more than 40°C in September in the South-West”, underlines Xavier Bonnehorgne, director of communication at Météo-France. In this context of accelerating global warming, “we have gotten so used to being hot that now we are surprised when there is a little cold snap that seemed normal 20 years ago”.
An increasingly rare cold
The data from Météo-France show it well: the cold snaps of the start of the school year like the one we are going through are becoming increasingly rare. Gone are the months of September like those of 1972 (monthly anomaly of -3.31°C, 14 days at -3°C compared to normal), 1952, 1965 for the three coolest and more recently 2008 (-1.68 °C above normal, 9 days below normal). In recent years, the cold days have become fewer and fewer and less and less cold. Moreover, despite the slight cold snap of recent days, September 2022 remains rather mild for the moment, with from the 1st to the 20th, a positive anomaly of +1.5°C.
Conversely, warmer than normal days are on the rise, and most importantly, they are getting hotter, as evidenced by the September 12 heat spike that saw the national record for the month fall. in Pissos, in the Landes, where it was 40.2°C that day.
Here again, the figures are clear and show that we have finally become so used to being hot in September in recent years that we have forgotten that it can also be cold.
“There is therefore nothing abnormal about the cool sequence that we have been experiencing for a few days and reminds us that even if the trend is unquestionably warming, the episodes of cool weather, even cold, will still be present in the quarters and years to come”, recalls Météo-France. But it is indisputable that their frequency and intensity tend to decrease.
“It’s been hot since January 1st”
It must be said that each decade since 1970 has been warmer than the previous one in France and the current one should be no exception to the rule after a year 2022 during which “only 13 days recorded values 2.5 ° C lower than normal. against 105 days with a higher thermal excess of 2.5°C”, according to Météo-France. “To put it simply, it has been hot since January 1,” summarizes Xavier Bonnehorgne.