To calculate PET, it is necessary to determine the meteorological parameters, which are important for human energy balance at a human-bio meteorologically significant height.

The variables are employed at daily scale, for each of which daily mean has been calculated.

The second stage deals with evaluation of impacts of climate change on the tourism of studied regions from 2014 to 2039.

This section was conducted by employing the output of HADCM3 model, two scenarios of B1 and A1B over 2014-2039.

Finally with recalculation of PET with downscaled data (by LARS-WG5 Software) the suitable weather in future can be guessed.