The base of the paper is series of the measurement of air temperature at the Jagiellonian University climatological station, collected since 1792. Average values were completed and verified. Generally, during the 19th century the monthly temperatures from November to March were lower than later.May, June and August showed the small air temperature fall. In July, September and October the long-term tendency is close on the point of nought. Each monthly course of the air temperature appears the considerable fluctuation from year to year.
The courses of daily air temperature at the centre of Lublin (UMCS station) and outskirts (Hajdów station) have been compared based on 1996 datas. The temperature, in average in the most part of the 24 hours period, is higher at the centre than at the outskirts. The highest differences are almost I.s"C and occur between 20.00 and 4.00. The temperature at the both stations between 8.00 and 13.00 is similar.
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