Analysis of the automated measurements since 1982 shows significant regional variation. Mild temperatures and precipitation-free evenings on the Swiss national holiday on 1st August are not guaranteed.
Anything from dry to stormy
The region around the nation’s capital city of Bern came out well on top for the analysed period from 1982 onwards, with only a handful of rainy evenings on 1st August. Favourable conditions were also found in Basel and Geneva, as well as in Lugano on the southern side of the Alps.
Rain was more frequent towards the east and in the Alps. In Adelboden and Glarus, for example, it rained in the evening of 1st August every other year on average.
The regional variations are mainly attributable to summer thunderstorm activity, which is more pronounced in the Alpine regions than in the lowlands.