Height of individual waves observed once in 20 years in January, April, June and October

Conventions: Mean height h(m), period of sea waves t(s)
Reference: Hydrometeorology and Hydrochemistry of Seas (1992). Volume VI The Caspian Sea. Issue 1 Hydrometeorological regime. Eds. F.S. Terziev, A.N. Kosarev, A.A. Kerimov.

Height of individual waves observed once in 20 years
Height of individual waves observed once in 20 years in January
Height of individual waves observed once in 20 years in April
Height of individual waves observed once in 20 years in June
Height of individual waves observed once in 20 years in October