From AMS Glossary
The character of the seasonal distribution of rainfall at any place.
The chief rainfall regimes, as defined by W. G. Kendrew (1961), are equatorial, tropical, monsoonal, oceanic and continental westerlies, and Mediterranean.
Kendrew, W. G. 1961. Climates of the Continents. 5th ed., Oxford, Clarendon Press, . 608 pp.