Calculation of RayMan model tourism climate indices in Yasuj city and study of their trend

According to three indicators, comfort and convenience conditions without heat or cold stress for tourists in Yasuj city, 6 to 7% of the total days of the year, i.e. about one month, which is based on the PET index, in April and based on PMV and SET indices are in late May and early June. According to PET and PMV indices, the tourism climate in Yasuj in a year is mainly cold to very cold with severe to very severe cold stress, while the conditions of the tourism climate according to the SET index are cool to very cool. Compared to the climatic realities, it seems that the PMV index better than the other two indicators reflects the tourism calendar of Yasuj city both in terms of determining the most appropriate tourism time and in terms of the main conditions of the tourism climate during the year. Regarding the study of the trend of tourism climate indicators and the parameters affecting them, the results show that the parameters of dry temperature and vapor pressure from February to July have an increasing trend and from August to January have a decreasing trend. The parameters of humidity, wind speed and cloudiness from February to July have no trend and from August to January have a decreasing trend. PET, SET and PMV indices have a trend in all months of the year except July, so that they have an increasing trend from February to July and a decreasing trend from August to January.