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{"id":9149,"date":"2025-04-01T11:59:23","date_gmt":"2025-04-01T09:59:23","guid":{"rendered":"https:\/\/www.umweltnetz.ch\/content\/?p=9149"},"modified":"2025-04-01T12:00:45","modified_gmt":"2025-04-01T10:00:45","slug":"seegfroerni-indikator-kaeltesummen-an-den-groesseren-zuercher-seen-im-winter-2024-25","status":"publish","type":"post","link":"https:\/\/www.umweltnetz.ch\/content\/seegfroerni-indikator-kaeltesummen-an-den-groesseren-zuercher-seen-im-winter-2024-25","title":{"rendered":"Seegfr\u00f6rni-Indikator: K\u00e4ltesummen an den gr\u00f6sseren Z\u00fcrcher Seen im Winter 2024\/25"},"content":{"rendered":"\n

1. April 2025: Auch im Winter 2024\/25 blieben die K\u00e4ltesummen an Pf\u00e4ffikersee, Greifensee und Z\u00fcrichsee eher tief \u2013 Seegfr\u00f6rnen blieben aus.<\/p>\n

Der Ausblick f\u00fcr die drei Folgewochen von MeteoSchweiz<\/a>  und der  Saisonausblick von MeteoSchweiz<\/a> werden in den Fr\u00fchlings-, Sommer- und Herbstmonaten regelm\u00e4ssig aktualisiert.<\/p>\n

<\/p>\n


\n

9. M\u00e4rz 2025: Nach einigen wenigen kalten Tagen im Februar haben sich die K\u00e4ltesummen an den Z\u00fcrcher Seen leicht erh\u00f6ht. Seit einigen Tagen ist es geradezu fr\u00fchlingshaft.<\/p>\n

28. Januar 2025: Bis vor einigen Tagen haben sich an Z\u00fcrichsee, Greifensee und Pf\u00e4ffikersee die K\u00e4ltesummen des Winters 2024\/25 erh\u00f6ht. Seither sind die Temperaturen eher mild.<\/p>\n

14. Januar 2025: Am Z\u00fcrichsee, am Greifensee und am Pf\u00e4ffikersee wurden in den letzten Tagen k\u00fchlere Tagesmitteltemperaturen erfasst, mit mehr oder weniger regelm\u00e4ssigen Beitr\u00e4gen zu den K\u00e4ltesummen des Winters 2024\/25.<\/p>\n

30. Dezember 2024: In den letzten Tagen lagen am Z\u00fcrichsee, am Greifensee und am Pf\u00e4ffikersee die Tagesmitteltemperaturen unter 0 \u00b0C. Es kamen somit (kleinere) Beitr\u00e4ge zu den K\u00e4ltesummen des Winters 2024\/25 zusammen.<\/p>\n

23. Dezember 2024: Am Z\u00fcrichsee und am Greifensee gab es bis kurz vor Weihnachten 2024 keine Beitr\u00e4ge zur K\u00e4ltesumme des Winters 2024\/25. Am Pf\u00e4ffikersee ist bis jetzt im Winter 2024\/25 eine kleine K\u00e4ltesumme zusammengekommen.<\/p>\n


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<\/p>\n


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Einordnung der K\u00e4ltesummen der Winter 2010\/11 bis 2024\/25 f\u00fcr den Z\u00fcrichsee<\/h3>\n

–><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Winter
(November bis
M\u00e4rz)<\/td>\n
K\u00e4ltesumme Z\u00fcrichsee
[Kelvin-Tage]<\/td>\n<\/tr>\n
Erforderliche K\u00e4ltesumme f\u00fcr eine Seegfr\u00f6rni<\/td>\n320
<\/strong><\/td>\n<\/tr>\n
2011\/12<\/a><\/td>\n120.6<\/td>\n<\/tr>\n
2010\/11<\/a><\/td>\n71.1<\/td>\n<\/tr>\n
2016\/17<\/a><\/td>\n68.8<\/td>\n<\/tr>\n
2012\/13<\/a><\/td>\n61.7<\/td>\n<\/tr>\n
2017\/18<\/a><\/td>\n41.5<\/td>\n<\/tr>\n
2020\/21<\/a><\/td>\n30.4<\/td>\n<\/tr>\n
2014\/15<\/a><\/td>\n24.1<\/td>\n<\/tr>\n
2023\/24<\/a><\/td>\n20.7<\/td>\n<\/tr>\n
2022\/23<\/a><\/td>\n20.2<\/td>\n<\/tr>\n
2024\/25<\/td>\n10.8<\/td>\n<\/tr>\n\n
2018\/19<\/a><\/td>\n9.1<\/td>\n<\/tr>\n
2015\/16<\/a><\/td>\n7.1<\/td>\n<\/tr>\n
2013\/14<\/a><\/td>\n5.2<\/td>\n<\/tr>\n
2019\/20<\/a><\/td>\n2.8<\/td>\n<\/tr>\n
2021\/22<\/a><\/td>\n1.7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

(h\u00f6chste K\u00e4ltesumme  2010\/11 bis 2023\/24 blauer Hintergrund, niedrigste K\u00e4ltesumme rot; beim Pf\u00e4ffikersee und beim Greifensee gab es Ausf\u00e4lle und Ver\u00e4nderungen bei den Messstationen, darum keine Liste der K\u00e4ltesummen)<\/p>\n

Vergleichsgrafik Z\u00fcrichsee<\/h3>\n

<\/p>\n


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Hintergrund zu Seegfr\u00f6rni\/Seegfr\u00f6rnen<\/h2>\n

\u00abGibt es in Zukunft noch Seegfr\u00f6rnen?<\/a>\u00bb fragte MeteoSchweiz am 20. Februar 2020 (als Beitrag beim scnat netzwerk zu finden) \u2013 eine Art Prognose: Durch den Klimawandel d\u00fcrften Seegfr\u00f6rnen zuk\u00fcnftig noch seltener werden.<\/em> <\/p>\n

MeteoSchweiz-Blog (16. Januar 2023) zur Z\u00fcrichsee-Seegfr\u00f6rni 1963<\/a> \u2013 gem\u00e4ss einem SRF-Beitrag<\/a> lag die K\u00e4ltesumme im Winter 1962\/63 bei 500 Kelvin-Tagen.<\/p>\n


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Verwendet werden die im Internet verf\u00fcgbaren Daten von drei Messtationen:<\/p>\n