As at the beginning of each month, we offer you a climatological report of the past month. Place therefore in the mapped balance sheet of the month of JUNE 2023 in terms of temperature, rainfall and sunshine on a panel of 73 stations*. The statistics are calculated under the official climate average for the period 1991-2020.
While June 2023 was not marked by high temperatures, the heat was regular throughout the month. As a result, the balance sheet is implacable with a thermal surplus on a national scale of +2.5°C. It is therefore the 17th consecutive month without being below season averages.
29 of the 30 days of the month were surplusonly the very last day (June 30) managed to drop below the averages thanks to the return of a more oceanic flow.
Daily temperature anomaly in June 2023 in France – deviation from the 1991-2020 mean – Infoclimat
This excess of +2.5°C (national indicator of 21.5°C) brings this month of June 2023 to 2nd hottest measured in France, just behind the incomparable month of June 2003 (indicator of 22.5°C, anomaly of +3.5°C). On the coolest side since the post-war period, we have to go back to 1972 with an anomaly of -3.2°C (nearly six degrees cooler than this year).
Average of the national thermal indicator in June since 1946 – Infoclimat
Throughout the national network, only 3 stations were below averages very marginally: -0.1°C in Cessy (Ain), Regusse (Var) and Méailles (Alpes-de-Haute-Provence).
If the thermal excess is on average between +1.5°C and +2°C in Occitanie, Provence, Auvergne and Rhône-Alpes, it reaches in a more remarkable way the +2.5°C to +3.5°C on average from Charentes to the North-East, passing through Pays-de-la-Loire, the Centre, Ile-de-France and even Hauts-de-France. Among the highest anomalies in our panel, we note +3.6°C in Paris and Luxeuil, +3.7°C in Nantes and Le Mans, or even +3.8°C near Lille. On the secondary network, the anomaly even climbs to +4.1°C in Guebwiller (Haut-Rhin) and Lormes (Nièvre).
Note that at Lille or Paris to name just these cities, this month of June was hottest ever measured. An impressive statistic for Paris, whose reference station (Parc Montsouris) performs measurements interrupted since 1873, i.e. 150 years !
On the rainfall side, the results remain very contrasted according to the regions, even if a slight excess spring, about +8% on our panel of stations.
In fact, the situation at the end of May continued during the first two dekads of the month of June, i.e. a time anticyclonic and very dry in the North (>>), contrasting with numerous almost daily thunderstorms in the southern regions (>>) even causing floods in urban areas such as Paris, Toulouse or Lyon (>>). Storms which ended up being much more organized and violent at the start of the 3rd decade, with hail and gusts of wind sometimes destructive from South-West to North-East (>>).
In the end, the entire country was confronted with at least one thunderstorm during the month (only Finistère as well as rare sectors of Moselle and the Ardennes did not observe thunderstorms). June 2023 is therefore placed at 2nd rank of the most struck down over the period 1997-2023 (twice as many impacts as the average), just behind June 2022.
Lightning strikes recorded in June 2023 – Meteo60.fr
This lasting anticyclonic period in the North of France resulted in a rainfall deficit of around -20 to -60% north of the Loireor even locally -70% in Hauts-de-France (-70% in Lille) or in the Great East (-70% in Nancy, -75% in Metz). On the secondary network side, the most marked deficit is to be put in respect of the communes of St-Leger-en-Yvelines or even of Seingbouse (Moselle) with -94%.
A quite different assessment on the southern regions where the storms locally brought large accumulations. June therefore ended on excess values in the southern half, in southern Corsica, and more locally thanks to the storms at the end of the month between the Center and Champagne-Ardennes. If the excess frequently reaches +50 to +100% in the South, the Occitanie region was one of the wettest with sometimes more than twice the usual accumulation (+105% in Toulouse, +152% in Carcassonne and Millau). However, the most exceptional surplus is for the city of Apartment (Vaucluse) where the numerous thunderstorms gave more 5 times the amount of rain of a normal month of June (+403%).
Rare exceptions should be noted in several towns bordering the Mediterranean: the Roussillon (-47% in Perpignan) or the French Riviera (-45% in Nice, -54% in Hyères) were less affected by these storms.
Translated in terms of cumulative rainfall, the least watered cities are therefore, for the most part, north of the Seine, with often less than 50mm. In Hauts-de-France, Grand-Est, Pays-de-la-Loire or Brittany, it is not uncommon to see accumulations of less than 25mm (24mm in Rennes, 21mm in Nantes, 19mm in Lille, 17mm in Nancy, 14mm in Metz). The national minimum is to be credited to Saint-Léger-en-Yvelines with only 3.2mm. Roussillon, Cote d’Azur and the Provençal coast also harvested very little water over the past month (20mm in Nice, 17mm in Hyères, 12mm in Perpignan).
Conversely, the accumulations reached 100 to 150mm on average in New Aquitaine, Auvergne, Midi-Pyrénées, Rhône-Alpes and the Provençal interior. The wettest cities in the panel are Aurillac (141mm), Limoges (143mm), Millau (144mm) and Saint-Girons (149mm). Lomné, in the Hautes-Pyrénées, was the wettest city nationally with 257.2mm.
If the rainfall was contrasted, the differences were even more notable on the sunshine side. On a national scale, however, the results are largely excess, around +20%.
The many stormy situations in the southern half have brought some cloudiness, causing a dsunshine eficit between Aquitaine, Occitanie, Provence, Côte d’Azur and Corsica. Deficits which locally reach -10 to -20% depending on the city (-11% in Nice, 12% in Nîmes, -15% in Saint-Auban, -18% in Tarbes, -19% in Embrun).
Conversely, the sun was omnipresent on the northern cities, especially after the first 3 anticyclonic weeks with almost no clouds. THE surpluses are remarkable, even exceptional, between +30 and +50% on averageor even close to +60% on several cities in the Grand-Est (+55% in Charleville-Mézières, +58% in Strasbourg, +59% in Langres, +60% in Nancy).
As a result, the map of the total duration of sunshine is quite comical with the cities of the South much more gray than those of the northern half. Apart from Hyères (307h) and Ajaccio (329h), none of the cities in the southern half on our resort panel managed to exceed 300 hours of sunshine, unlike the cities in the northern half. !
While a Breton city held the palm of the sunniest city in May, this first place remains in the northern half for June, with 358 hours on the Strasbourg side ! With values between 320 and 360 hours, pSeveral towns in the Grand-Est have notably experienced the sunniest month in their history.
It’s sunshine sometimes twice as high as that observed at the foot of the Pyrenees. A Pyrenean foothills marked by frequent thunderstorms and therefore significant cloudiness, not allowing 200 hours of sunshine to be reached (176 hours in Saint-Girons, 161 hours in Tarbes, and a national minimum of 141h in Bustince in the Pyrénées-Atlantiques).
Summary:
* PANEL OF 73 STATIONS
Temperature – rainfall – sunshine:
Agen, Ajaccio, Albi, Alençon, Angers, Aurillac, Bastia, Beauvais, Bergerac, Besançon, Biarritz, Bordeaux, Bourg-Saint-Maurice, Bourges, Brest, Brive, Caen, Carcassonne, Charleville-Mézières, Chartres, Châteauroux, Cherbourg, Clermont-Ferrand, Cognac, Colmar, Dijon, Embrun, La-Roche-sur-Yon, Langres, Le Mans, Le-Puy-en-Velay, Le Touquet, Limoges, Lorient, Luxeuil, Lyon-Bron, Mâcon, Marseille- Marignane, Melun, Millau, Mont-de-Marsan, Montélimar, Montpellier, Nancy-Essey, Nantes, Nevers, Nice, Nîmes-Courbessac, Niort, Orléans, Paris-Montsouris, Perpignan, Poitiers, Rennes, Saint-Brieuc, Saint- Etienne, Saint-Dizier, Saint-Auban, Saint-Geoirs (Grenoble), Saint-Girons, Strasbourg, Rouen, Tarbes, Toulouse-Blagnac, Tours, Troyes.
Temperature – rainfall (partial or total absence of sunshine data):
Abbeville, Lille, Metz, Hyères, Romorantin, Saint-Quentin.
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