The regional features of the annual cycle climatic seasons structure defined according to the meteorological stations of Northern Eurasia, and also current trends in the duration of the annual cycle growing season are described in the article. During the search of connection between the seasonal rhythm and the solar activity rhythm must be taken into account not only the regional climatic features of the seasons annual cycle structure, but also the progress features of each element of the solar activity rhythms. The great increase in the duration of the summer season phases in the beginning of the second quarter of 11-year cycle of solar activity, which is followed by reducing of these phases and the new increase at the peak of the cycle have been found out by the authors. At the beginning of the fourth quarter of 11-year cycle of solar activity happens relatively sharp reducing of phases’ duration. In the western seashore and southern regions of Western Siberia one can observe the increase of growing season duration up to 18 days; and up to 1 day for the northeastern regions (Anadyr). In the northern seashore areas, a year growing season reduction for 2 days (Naryan-Mar), 11 days (Khatanga) and 14 days (Dixon) is observed.