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.
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