-47 °F 0 on January 22, 1947, up to 91 °F 0 on June 27, 1953. The coldest month has been January 1947 and December 1942 with a mean temperature of -6.5 F 1 , while the warmest month was July 2019 at 63.2 F 1 ; the annual mean temperature has ranged from 28.2 F 1 in 1956 to 42.1 F 1 in 2019.

Iliamna receives 25.01 inch 0 of annual precipitation, mostly between summer and fall. September 1961 was the wettest month, with 11.02 inch 0 of precipitation, and there were many