Summary:

The humidity conditions of a certain area depend mainly on the level which precipitation, being a natural water taking, covers its expenditure. It has been noticed series of precipitation deficiencies in Poland for the last years, which often cause heavy droughts. They can be a barrier in the intensification of plant production. In the study it was shown the characteristic of water deficien-cies in RSD Zawady. It was used data from 2002–2008 period coming from an automatic weather station. Particular months, vegetation periods and years were classified according to precipitation category using Kaczorowska’s division. In order to describe deficiencies and surpluses of humidity it was calculated the climatic water balance (P-E). Using the optimal precipitation table by Klatt it was determined surpluses and deficiencies of precipitation for the selected crops. The results of the investigation show that September was a very dry month. Only in last two years it was considered as wet. The highest water deficiencies for the selected cereals were observed in June. The analysis of the deficiencies for the particular months points that the smallest difference between precipitation and area vaporization was in October and the biggest one in April and June.