AbstractResults of 6‐year concurrent observations of Schumann resonance at the Ukrainian “Akademik Vernadsky” Antarctic station (65.25°N, 64.25°W) and at SOUSY Arctic facility (Svalbard 78.15°N, 16.05°E) are analyzed and compared. Measurements were performed simultaneously by using similar techniques and the calibrated digital equipment. The long‐term records of two orthogonal horizontal magnetic field components demonstrated seasonal and interannual changes in the peak frequency and intensity of the first Schumann resonance mode. The analysis of the annual variations of these parameters in different hemispheres allowed us to select the “electromagnetic seasons.” We suggest that each “electromagnetic season” corresponds to the characteristic pattern of diurnal peak frequency variation determined by lightning the source‐observer configuration. This configuration is unique for each observation point and varies from one season to another in line with the seasonal latitudinal north‐south drift of world thunderstorms. Our observation has demonstrated the different duration of “electromagnetic seasons” in the Arctic and Antarctic. To study the formal reason of this discrepancy, the final data were processed using the singular value decomposition (SVD) algorithm, which allowed us to identify the principal components (PCs) of the time series. The implementation of this technique to peak frequency variation showed the phase shift between the semiannual PCs at the Southern and Northern Hemispheres that explains the different duration of “electromagnetic seasons.” The SVD of the first Schumann resonance mode intensity demonstrated the phase shift between annual variations in different hemispheres and complicated the behavior of other PCs that deserve a separate study.