Table S1. Recent summer (1 June – 31 August) temperatures in Switzerland in comparison to the 1981-2010 climate norm and the exceptional summer of 2003, as well as summer temperature and precipitation for the 24 sites used in this study. Data represent means ± standard deviation (where available). Nationwide data are from MeteoSwiss (Zurich, Switzerland) and field site data are from Meteotest (Bern, Switzerland).