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PL
Analiza pokrywy śnieżnej w Krakowie w okresie 1921/22-1996/97 wykazała istnienie ujemnego trendu liczby dni z pokrywą śnieŻllą i brak wyrażnych tendencji w przypadku maksymalnych grubości i sum grubości pokrywy śnieżnej w sezonach zimowych. Stwierdzono wyraŻlly spadek wartości liczbowych charakterystyk pokrywy śnieżnej w Krakowie od początku lat sześćdziesiątych. Badano szeregi czasowe pokrywy śnieżnej dla kilku stacji zamiejskich pracujących w tym okresie. Dla pięciu, z sześciu wziętych pod uwagę, stacji spadek wartości maksymalnych grubości pokrywy śnieżnej okazał się wolniejszy niż obserwowanych w centrum Krakowa.
EN
An analysis of snow cover in Cracow during the period 1921/22-1996/97 indicated a negative time trend for number of days with snow cover and lack of clear tendencies in maximum depth and sum of daily snow cover depths during winter seasons. A considerable decrease in all snow cover characteristics in Cracow from the beginning of the '60s was found. The snow cover time-series for several suburban stations recorded during this period· were analysed. For five, among six stations under considerations, a decrease in maximum snow cover appeared to be slower than that observed in the Cracow city centre.
EN
This paper includes an analysis of the occurrence of the snow cover in Łódź. This analysis is based on materials of 40-year snow measurements at the meteorological station in Łódź- -Lublinek. Basic characteristics of snow cover have been calculated that is: number of days of the potential period, number of days with the snow cover and number of days with the permanent cover. Basic statistics in winter seasons have been marked: sums of snow cover thickness, maximal, minimal and average of snow cover thickness for separate period characteristic, for all the season. The relationship between lengths of characteristics period of snow cover have been tested. Dependence of thermic and snow conditions of winters in Łódź has been stated. The relationships of appearance of winter seasons of extreme snow condition with frequency of appearance of particular types of air circulation have been stated.
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