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The zonal index, version for Central Europe (called ‘for Poland’), was proposed by Lityński. He calculated the pressure difference between latitudes 40° and 65°N on the zone 0-35°E. This paper presents the characteristics of the zonal index based on Lityński’s concept and the NCEP/NCAR grid data. A statistically significant increase (1948-2016) occurs in mean values of the zonal index for winter and for the entire year, as well as in the standard deviation and 99 percentile of zonal index. The annual course of the zonal index is evident.

Variability of the zonal circulation index over Central Europe according to the Lityński method