*2.1. K-G Classification*

Köppen and Geiger classified climate based on annual and monthly mean values of temperature and precipitation. Table 1 contains the methodology to calculate K-G climate zones in Europe based on [8].

**Table 1.** Key to calculate K-G zones in Europe and their third index. Pann is the accumulated annual precipitation. Pmin is the precipitation of the driest month. Psmin, Psmax, Pwmin and Pwmax are defined as the lowest and highest monthly precipitation values for the summer and winter half-years. Pth is the dryness threshold. Tann is the annual mean temperature, and the monthly mean temperatures of the warmest and coldest months are marked by Tmax and Tmin, respectively. The precipitation and temperature are given in mm and ◦C, respectively.


The dryness threshold is calculated by

$$P\_{th} = \begin{cases} 2\left\{T\_{ann}\right\} \text{ if at least} \frac{2}{3} of the annual precipitate occurs \in winter\\ 2\left\{T\_{ann}\right\} + 28 \text{ if at least} \frac{2}{3} of the annual Precipitation occurs \in summer\\ 2\left\{T\_{ann}\right\} + 14 \text{ otherwise} \end{cases}$$
