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The aim of this thesis was to present the characteristic of precipitation conditions in Suwałki Lake District. Analysis was made on the base of daily sum of precipitation of six meteorological stations during 1971–2000 period. Frequency of months and seasons with defi cit or excess of precipitation according to Kaczorowska’s criterion, frequency of non-precipitation day sequences >10, >15 and 20 days in the periods April–May, June– July, August–September and April–September were taken into consideration. Numbers of days with-precipitation ≥ 0.1 mm, ≥ 1.0 mm, ≥ 10.0 mm, ≥ 20.0 mm and ≥ 30.0 mm was analyzed also. All examined weather stations indicate that precipitation shortages are characteristic for the 90”s. Not only total precipitation amount indicate that, but also their classifi cation presented according to Kaczorowska as well as precipitation – free periods.
The analysis of rainfall from the period of 1971-2000 recorded in the Beskid Sądecki Mountains, in the phytoclimatic research station in Kopciowa near Krynica (φ = 49º 27'N and λ = 20º 58'E, located at the altitude of 720 m) indicated a strong rising tendency of rainfall in winter, spring and autumn. It was reflected in a clearly positive trend of the annual rainfall totals, despite the falling tendency of rainfall in the summer. On average, the annual rainfall totals were 1000 mm. During this 30-year period, the monthly totals of the summer months were characterised by the strongest variability, while the winter months' variability was the weakest. The highest rainfall totals were usually recorded in June and the lowest in February. The mean annual rainfall total increased during the thirty years by 208 mm. An increase in the amount of rainfall during spring and winter and a decrease in the summer indicates that the pluvial climate of the area under research has acquired oceanic features.
The analysis of the meteorological vegetation season from the period of 1971-2000 was recorded in the Beskid Sądecki Mountains, in the phytoclimatic research station at Kopciowa near Krynica. The station is located at the altitude of 720 m. Its geographical coordinates are φ = 49º27 N and λ = 20°58' E. This paper jointly presents the length of the vegetation season and dates of its beginning and end. In the years 1971-2000 the meteorological vegetation season began on average on 14 April and finished on 19 October. Its duration was 189 days. The shortest vegetation season was noted in 1997 and lasted 160 days. The longest one occurred in 1989 for 211 days. The duration and dates of the beginning and ending are characterised by a large annual changeability. Almost 25% of annual indicators differed from one another by two weeks. The earliest date of the beginning of the vegetation season fell on March 28, 1989; the latest was on May 1, 1980. The latest end date of a meteorological vegetation season was November 16, 2000. The earliest end date was September 30, 1997. The average multi-annual air temperature of the vegetation season was 10,5°C. The warmest vegetation season in of the period of 1997-2000 occurred in 1983, with an average air temperature of 11.7°C.
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