Dni z pogodą parną w okolicy Lublina i Nałęczowa w latach 1966 – 2010
Sultry days in the Lublin and Nałęczów region from 1966 to 2010

Summary/Abstract: The authors investigated days of sultry weather in the Lublin and Nałęczów region from 1966 to 2010. A long-term variability of such days in relation to the three biometeorological indices : the Scharlau’s criterion, the equivalent temperature and the Heat Stress Index (pHSI) was analyzed. Days of sultry weather can occur in the analyzed area from May to October, but a clearly higher frequency is limited to the period from June to August, with a maximum in July. The most uncomfortable bioclimatic conditions were noticeable in the second half of the day, when air temperatures were highest. The study also showed that the pHSI index has the greatest practical importance because it has been determined on the basis of the human heat balance model and we can also calculate the number of days with various intensity of sultriness. Regardless of the method of calculating biometeorological indices, a significant increase in the risk of dehydration and overheating of the human body was found. The reason is an increasing number of sultry days that occur in long sequences. The upward trend may limit all kinds of physical outdoor activity in the study area.

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