In the study tendencies in changes of frost-free season at 20 meteorological stations in Poland in the period 1951-2006 were examined. Both changes in the beginning and the end of frost-free season and its length were analysed. At 13 of those examined stations the frost-free season were beginning sooner and sooner (16 days/50 years an average), whereas the tendencies in changes of the end of analysed season
lack such a clear distinction. Nevertheless, the length of frost-free season was noticed to be longer from about 15 days in Legnica to about 32 in Łódź. Th e most signifi cant of the described changes occurred in the west part of the country and the lowest in the east part.
keywords in Polish:
okres bezprzymrozkowy, ostatni i pierwszy dzień z przymrozkiem, zmienność wieloletnia, Polska
keywords in English:
frost-free season, the last and the first day with frost, long-term variability, Poland
affiliation:
Wydział Biologii i Nauk o Ziemi : Instytut Geografii i Gospodarki Przestrzennej
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