In earlier papers (Model Atmospheres I and II), a procedure was developed for determining the most probable vertical temperature profile associated with the occurrence of 1% world-wide temperature extremes at mandatory-pressure levels, and at stations where such extremes are known to exist. The same technique based upon the use of the stepwise multiple regression analysis was employed in this study to determine vertically consistent atmospheres corresponding to known oceanic extremes. Cold open-ocean extremes were found to exist up to 300 mb primarily near the Labrador coast at OSV 'B', while the warm-open ocean extremes were found to exist in the vicinity of Majuro atoll of the Marshall Islands. The warmest of all sea-extremes for near-port conditions was found to exist in the Persian Gulf (near Station Bahrain). (Modified author abstract)