The analysis of susceptibleness of construction employees to heat stress, the results of that area unit conferred during this paper, was a crucial analysis module of the massive research targeted on safety of employees on construction sites. The paper assesses the likelihood of victimisation totally different sets of knowledge gathered fully scale on the system and on the meteoric station to estimate the warmth stress of individuals functioning on system. The most purpose is to visualize if the employment of public knowledge from meteoric stations will offer reliable estimation. A simplified formula of Universal Thermal Climate Index (UTCI*) is employed in analyses. The values of UTCI* calculated on the idea of 2 sets of input parameters area unit compared to every alternative and analysed. The measurements and UTCI* calculations area unit conferred for twenty-four system structures placed in x and Lower Silesian provinces. take a look at results supported construction sites and meteoric stations knowledge area unit totally different, however applied math analysis shows their correlation. A stronger correlation happens for system structures placed in, whereas it's weaker for the results obtained in Lower Silesian province. The results show the likelihood of simplified analysis of comfort/discomfort of individuals functioning on system on the idea of in public on the market environmental knowledge measured at meteoric stations.