Interannual variability of hail-days in the Andes region since 1885

Using documentary sources, a series of the annual number of hail-days in a region near Mendoza, Argentina was constructed. The analysis of the temporal series by means of singular spectrum analysis (SSA) and the maximum entropy method (MEM) found that the number of hail-days exhibits a similar interannual variability as the global surface temperature [M. Ghil, R. Vautard, Nature 350 (1991) 324-327]. The oscillations exhibit interdecadal periods of 22 years and interannual oscillations of about 4 and 8 years.