In the paper problems of wave climate description and modelling are considered. Wave climate is considered as ensemble of conditions of spatio-temporal wave fields characterized by frequency-directional spectra. Such approach with reference to shipbuilding is caused by expansion of the nomenclature of characteristics of wave and a wind, which are necessary for construction and operation of engineering offshore constructions, and operation of ships. Using of expanded set of wave and wind characteristics takes possibility to introduce term “scenario” of wave weather much more correctly and to use it for estimation of navigation safety.