The study objective is to analyse the hydrothermal conditions in the growing season over the last five decades (1966–2015) in the middle part of the Wieprz-Krzna Canal area (central part of the Lublin Polesie region). The hydrothermal conditions in the growing season were described based on air temperature and precipitation volume data registered at the meteorological station in Sosnowica (eastern Poland). The meteorological station is located in the drained and reclaimed fen complex situated between the Wieprz-Krzna Canal and the Piwonia River. The humidity conditions in the analysed periods and sub-periods were assessed based on ranges proposed by Skowera and Puła according to Selyaninov Hydrothermal Index. In the five decades analysed (1966–2015), a systematic increase of the mean air temperatures was observed in the successive decades. The annual precipitation volumes in this area ranged from 327.2 mm to 819.5 mm, which is a considerable variation. The growing season (April to September) was characterised by a larger precipitation volume than the non-growing season (October to March). The growing season was extremely dry in the years 2002 and 2003, and dry or rather dry in 21 years. The other years had favourable humidity conditions in the growing season. However, an analysis of shorter (two-month) periods shows that unfavourable conditions prevailed particularly in the summer (June and July) and the summer/autumn period (August and September).
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