A storm in Lyon on June 3, 2023. @RW
Since October 18, it has rained in Lyon and the mainland more than 75% of the days. An impressive figure which reflects a particularly long rainy episode.
Do you have the impression that it has been raining continuously in Lyon for almost two months? That the sun has been absent from the landscape since the summer temperatures of early October? Well, you’re not entirely wrong. Even if the Lyon region has experienced a few days of calm over the last 50 days, since October 18, the date the precipitation began, it has rained more than 3 days out of 4. A ratio of 75% which represents 42 days affected by at least a few drops of rain on the last 56 which have just passed.
A historic episode at the national level
“Mid-October we suddenly went from summer weather and abnormally high temperatures (it was still 30 degrees on October 9 in Lyon) to a very different flow and almost non-stop rain since” begins Guillaume Séchet, meteorologist and founder of the site Weather-Lyon. At the end of November, at the national level, the rainy episode was the most significant ever recorded in France since 1958, both in quantity and in the number of days affected by this precipitation.
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“The only particularity of the Lyon region is the accumulation of precipitation” explains the meteorologist. Partly protected by the Massif Central, the Lyon metropolitan area has experienced abnormally high numbers of rainy days over the last 50 days, without the cumulative precipitation exceeding seasonal norms. Thus, in November, it rained in Lyon 21 days out of 30, including 16 days with a cumulative amount of more than 1 millimeter of rain, while the average for November is only 10 days. But with 71 mm of cumulative rain over the month last, the Lyon region is below the average, which is 87 mm. “It rained often but not in very large quantities because the bulk of the precipitation fell mainly on the Massif Central” continues Guillaume Séchet.
“We see the end of the rain tunnel”
Guillaume Séchet, meteorologist at Météo-Lyon
Despite everything, this long-lasting precipitation has made it possible to make up for the delay following the various droughts which affected the region this year. “We returned to the average for the year in terms of precipitation in the Rhône” explains the forecaster. Since October 18, 270 mm of rain has fallen, or a third of the annual average precipitation in the Rhône department (821 mm).
“We see the end of the rain tunnel” reassures Guillaume Séchet, explaining that the current episode, which has lasted for six days non-stop, should end on Thursday. “From Friday we should find very calm, anticyclonic weather, at least for 10 days or even two weeks.” he adds. But if the rain should disappear from the daily lives of Lyonnaises, this does not mean that the sun will resurface. “At this time, anticyclone often means gray weather. We might not see much sun with probably fog in the morning“.
A return of rain in early 2024?
After this parenthesis without rain, the latter could however invite itself to the party again for the start of 2024. “The overall trend for the coming months is a return of lasting rain across the whole of Western Europe.” concludes Guillaume Séchet. You still have 12 days left to order your boots and raincoats from Santa Claus.
2023-12-12 18:06:08
#rainy #days #midOctober #Lyon
