switzerland is located within a temperate climatic zone. In the west and northwest the influence of the temperate Atlantic climate is felt more strongly, in the east the influence of the continental climate. At a latitude of 47 North, the climate is moderate and generally agreeable. Temperatures depend largely on altitude, with averages 5°C lower for each additional 300 m of elevation. Summers can be hot, with temperatures sometimes reaching 30°C or more, summer evenings are usually cool.
Precipitation is distributed over the entire year. May, September and the first half of October tend to be the driest, April and November are usually the wettest periods. Again, High-level areas in the Alps may have a high average rainfall in excess of 2000 mm per year, while some regions in the flatlands of Switzerland have only 600 mm per year. From June through August, rain usually comes in the form of sometimes heavy thunderstorms, these storms can sometimes bring heavy hail and snowfall in the mountainous regions of the Alps, even in summer.
Weather conditions vary only slightly across the country, the lowland regions in the north and east have more continental influenced conditions with colder winters and hotter summers, and the southeastern areas of Switzerland have longer and warmer, almost Mediterranean-like summers. Be aware that whatever the season, if you're at a high altitude, the weather can change quickly and dramatically.
The winter snow cover lasts from late December through March in the valleys, from November through May at about 1,800 m, and becomes in many years permanent above about 2,500 m.
Lightweights with rainwear for summer, waterproof Medium- to Heavyweights for winter. A sweater is necessary almost any time of year.
The climate of Switzerland can be classified as Cfb Climate; a warm temperated humid climate with the warmest month lower than 22°C over average and four or more months above 10°C over average.The climate of the Mountainous Regions of Switzerland can be classified as Dfb Climate; a humid Snow climate with the warmest month between 10°C and 22°C, the coldest month below -3°C and at last four or more months above 10°C.