Spatio-Temporal Evolution of the Thermo-Hygrometric Index (THI) during Cold Seasons: A Trend Analysis Study in Iran

Global warming can cause deep and extensive changes in the Earth’s climate time place of climatic phenomena. The present trend analysis study assesses cold stress using thermo-hygrometric index (THI) two seasons autumn winter outdoor environments Iran. data related to average variables daily air temperature relative humidity from 60 synoptic meteorological stations for a statistical period 30 years were obtained Iranian Meteorological Organization. THI was calculated winter, level thermal discomfort determined each station. Mann–Kendall test with help Minitab ver17.1.0 software also used investigate temperature, index. increased 68% stations, this increasing is statistically significant 51% these stations. 83% In autumn, 53% range discomfort, only 5% comfort. decreasing some types, along indicate decrease monitored during studied years. It recommended know temporal spatial distribution probability occurrence through use order adopt preventive measures policies outdoors