May 2022 set a new monthly national average warm temperature record for the period 1946-2022. It closes a hot and dry spring. Frédéric Decker, meteorologist at MeteoNews, looks back on climate conditions over the past three months.
uno very mild to hot weather Temporarily very hot is more dominant in this month of May 2022, in particular between the 8th and 22nd with maximum heat exceeding 30 degrees in the southern two-thirds of the country. Temperatures fell at the end of the month in many regions, except near the Mediterranean where high temperatures remained.
The monthly national average temperature reached 17.1 degrees for the normal 14.9 degrees during the period 1991-2020. It was the warmest May since at least 1946. It far surpassed the old record set in the months of May 1989 and 1999 (16.2 degrees).
This is the first time since 1946 that a month of May exceeded its normal by 2 degrees or more, while all other months of the year have already achieved this “feat”.
In absolute value, in Ajaccio it was the warmest with a maximum of 36.2 degrees on the 27th (new monthly heat record). Adding the secondary weather stations, Oloron (Pyrénées-Atlantiques) stood out with 36.8 degrees on the 23rd.
National average spring temperature in France (©MeteoNews)
By consulting the oldest meteorological records, particularly in Paris, three months of May exceed 2022 (17.8 degrees), all located in the middle of the “little ice age”: 1684 and 1771 (18.4 degrees) and May record 1758 (18.9). degrees).
The seasonal average for meteorological spring (March 1 to May 31) in France reached 12.75 degrees for a normal of 11.7 degrees, or 1 degree above the 1991-2020 normal. Three springs have warmed slightly since 1946: 2020 (12.86 degrees), 2007 (12.88 degrees) and the record spring of 2011 (12.92 degrees).
High pressure conditions everywhere prevented the circulation of low pressure current in our country. Despite the heat, there were relatively few thunderstorms. As a result, rainfall is sparse and low, making May 2022 the driest since at least 1946.
The monthly national average of rainfall in France is in fact only 23 mm, beating the May 2011 record (24 mm) by a breath.
Chamonix had the heaviest rain at 82 mm of rain during the month. More locally, it fell to 136 mm in Montgellafrey (Savoie).
In contrast, Alistro (Corsica), Istres (Bouches-du-Rhône) and Nice received only 2 mm. In a small town in Ain, Ceyzériat, it did not rain in May. The last shower was on April 30 (0.2 mm) and the next on June 1 (2.2 mm).
With three months in deficit, the spring of 2022 was the fifth driest in France since at least 1946. On the national average, only 107 mm of rain fell against the normal 179 mm. The deficit therefore reached 40%!
It also fell 107 mm in the spring of 1976, 103 mm in 1997, 100 mm in 1953, 97 mm in 1955 and the record set in the spring of 2011 with only 90 mm.
The 182 mm received since January 1 is far from normal (307 mm). The deficit reached 40%! Only the year 1953 was worse in the first five months of the year with only 152 mm.
Finally, it fell to 412 mm from last October for a normal of 547 mm, i.e. almost 25% deficit. Even lower figures were recorded only twice in the same period: 362 mm from October 1975 to May 1976; 331 mm from October 1948 to May 1949.
Logically, the number of sunshine in May 2022 was high, without breaking the record. 273 hours of sunshine in the monthly national average, sixth highest number behind 1990 and 1952 (280 h), 2011 (281 h), 2020 (286 h) and the record of 1989 (304 h).
Pau is the lightest city with 207 hours of the month, and Marseille-Marignane is the lightest with 334 hours.
With 646 hours of sunshine out of the normal 564 hours, spring is very sunny (15% more). But ten springs have been sunnier since 1946. Nothing unusual then.
A month of May in keeping with the trend of spring as a whole, especially warm, dry and sunny. The drought became severe on May 31, both on the surface and in the deep aquifer. We must look forward to the return of rain in the coming weeks to get through the summer of 2022 as calmly as possible. Storms at the beginning of June brought large amounts of water, slowing surface drying, but far from enough to stop the long-term drought.
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Using MeteoNews. Meteorologist: Frédéric Decker.
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