 On 9 February 2020, a temperature of was recorded on the island, which is the highest temperature ever recorded for the Antarctic region, breaking the previous record of recorded at Signy Island on 30 January 1982.The rocks making up Seymour Island date mainly from the Late Cretaceous to the Eocene.Successively younger rock formations found on the island are the López de Bertodano Formation (Cretaceous to early Paleocene) Sobral Formation and Cross Valley Formation (Paleocene) and La Meseta Formation (Eocene).