Mean daily temperature high in July, period 1961-1990

For the area-wide calculation, measured values from MeteoSwiss measuring stations in the period 1961-1990 were used. From the daily temperature curve, the highest temperature is selected, which occurs at all stations in the afternoon around 3 pm due to radiation. The mean maximum value of the daily temperature curve deviates slightly from the average daily maximum of the temperature. The maximum value of the daily variation was considered to be relevant for plants because it is associated with high solar radiation. Temperatures were spatially interpolated and vertically at different altitude levels using gradients. Exposure, radiation, glacier areas and cold air pools were also taken into account. The resulting map has a spatial resolution of 25 m x 25 m. It was used for modelling altitudinal belts of forest vegetation.