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The authors of the present paper made an attempt to determine frequency of average, dry and wet periods for months, seasons, half-years and years. Additionally a comparison of data recorded during 140 years allows to check the structure of excessively wet and excessively dry years’ patterns. The present paper is based on the Z. Kaczorowska’s classification (1962).
Key words: periods – average, extremely dry, extremely wet, Lębork