The hottest October since the start of the measurements is coming to an end –

October 2022 will go down in history as the hottest since measurements began in 1864. According to MeteoSwiss, temperatures were on average about 3.8 degrees too high in Switzerland.

Saturday is in line with the hot days of October. It was 25.4°C in Zweisimmen (BE) and 25.3°C in Ebnat-Kappel (SG), according to MeteoSwiss. In Fahy, in the Jura, the mercury rose to 25.1°C. On the Hörnli (ZH), it had not been so hot in October for more than 30 years, with 23.6 ° C.

The meteorological office’s measuring station on Basel’s St. Chrischona mountain also showed 24.7 °C. Göschenen (UR) recorded 24.3°C.

With the warm air, dust from the Sahara has arrived in Switzerland, wrote SRF Meteo Twitter. Visibility was reduced. A record was also recorded in the canton of Vaud at the summit of La Dôle at 1677 meters above sea level on Friday: 13.3 ° C, or 12 ° C higher than the norm.

Summer is particularly prolonged in the Jura. At the beginning of the afternoon on Friday, it had already been 25.5°C in Fahy and 26.6°C in Mervelier, according to SRF Meteo. The mercury even climbed to 27.4°C in Delémont, shortly after 3:00 p.m.

In terms of temperature, this is not a record. On October 7, 2009, 29.4°C had been measured in the Jura capital, recalled Urs Graf, meteorologist at MétéoSuisse, interviewed by Keystone-ATS. However, it has never been so hot during the second half of October.

Around 12°C normally

Very mild temperatures were recorded on Friday also at altitude, such as 24°C in St. Chrischona, near Basel, or 23.8°C in Göschenen (UR). On the Plateau, temperatures were around 20°C, said Urs Graf.

Even if these are not absolute records for October, which are in many places around 23 or 24°C, the situation is still exceptional. It is normally around 12°C on October 28.

Friday’s weather follows the trend of the whole month. It was punctually between 20 and 25 degrees in French-speaking Switzerland. On Monday October 17, considered by the meteorological services as a day that will go down in history, the mercury rose to 22.3°C in Courtelary in the Bernese Jura, 21.9°C in Evionnaz (VS) , 21.7°C in Geneva-Cointrin and 21.5°C in Fribourg. At 1000 meters above sea level, in La Chaux-de-Fonds (NE), it was just over 20°C.

For Lionel Fontannaz, also meteorologist at MeteoSwiss, this month of October will “go down in the annals of meteorology”. “We had a summer semester which was also extraordinary, and we are there on the same momentum”, underlines the expert on Saturday on the set of 7:30 p.m. The current temperatures correspond to those of summer days.

>> Read again: Switzerland had its second hottest summer since 1864

3.7°C above the norm on average

This month’s record temperatures have locally exceeded the maximum values ​​recorded so far by one degree, MeteoSwiss told Keystone-ATS on Friday. This strong heat was caused by persistent westerly and southwesterly currents, which brought mild air towards Switzerland between October 4 and 25, with prevailing anticyclonic situations.

>> Read also: October 2022: heat records in sight

Most regions of Switzerland were affected. In many places, the monthly values ​​exceeded the norm by 3 to 4.5°C from 1991 to 2020, added the Federal Office of Meteorology and Climatology. On a national average, the October temperature exceeded the 1991-2020 norm by 3.7°C. In second position, we find the month of October 2001, with 3°C more than the norm.

From October 15 to 21, the average daily temperature exceeded the norm by 5 to 7°C in places, even 8°C. Under the influence of the föhn, the difference even rose locally to between 8 and 9°C last Sunday. These summer temperatures illustrate extreme weather events, notes MeteoSwiss. They also augur warmer years in the future, with a shift in the norm towards warmer temperatures as well, explains Lionel Fontannaz.

In the same register, the snow had already appeared in October ten years ago, recalls MeteoSwiss on Twitter. Switzerland had woken up under a white coat all the way to the plain. On October 29, 2012, snow depth records had even been measured. As for this year, it is still “too early to make a projection on winter”, believes Lionel Fontannaz.

Interview by Fanny Zürcher/iar with the ats

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