"Average Values-Table, 1961-1990" (in German, French, and Italian). Federal Office of Meteorology and Climatology MeteoSwiss. Archived from the original on 27 June 2009. Retrieved 8 May 2009.
"Average Values-Table, 1961-1990" (in German, French, and Italian). Federal Office of Meteorology and Climatology MeteoSwiss. Archived from the original on 27 June 2009. Retrieved 8 May 2009.