In the Alps, the Valais is particularly prominent in terms of its frequent southerly foehn activity. The Montana and Visp weather stations recorded an average of 542 and 574 foehn hours per year respectively in the period of 1991–2020. This is significantly more than at the classic foehn site of Altdorf on the northern side of the Alps, where an average of 477 foehn hours per year has been recorded. The highest foehn frequency recorded in the Alps between 1991 and 2020 was at the Chur weather station in Graubünden, with an average of 726 foehn hours per year.
Considerable northern foehn activity can be observed on the southern slopes of the Alps. The Magadino and Lugano weather stations in southern Ticino recorded an average of 600 and 551 hours of foehn per year respectively during the 2007–2020 period for which data are available. The clear record holder for foehn is the Poschiavo weather station site in southern Graubünden, with an average of 1,162 foehn hours per year. This analysis is based on the 2008–2020 period for which data are available.
If these figures are converted to equivalent full days with 24 foehn hours, we can say that the foehn blew for 23 to 25 days per year in central Valais and southern Ticino. In Poschiavo, the foehn was present for more than 1.5 months per year, with an average of 48 full foehn days.