Hi Ami,
I have posted a reply in Visiting switzerland--need tips ! also!
Actually iam living in Lausanne,its the Southern part of swiss,40mins drive from Geneva!
Best time to visit wud be from May to September,I wud say u can very clearly enjoy all the 4 seasons when u come to switzerland!
April to June --it will be ultimately
Spring and its beutiful everywhere with Fresh Greenaries and beautiful Snow-capped mountains.
July-Aug--
Summertime--there u go -good time to visit and all the places will be open to reach the mountains.But i wud say--August(its a rainy season)
September-Nov--
Beautiful Autumn--u can enjoy the orange-yellow-green trees especially at Interlaken(a nice place with a calm and exclusive nature)!
December-March-Its
wintertime in swiss and most of the places will be closed except for Ski-run.
I shall post some list of good places to go around during the seasons in my future mails.
Keep this mail flowing,
sangeetha.