In general, the climate of the ice cap regions of the world; thus, it requires temperatures sufficiently cold so that the annual accumulation of snow and ice is never exceeded by ablation. The perpetu
al frost climate is one of the polar climates in W. Köppen's climatic classification and is characterized by a warmest-month mean temperature of less than 0C (32F). It is designated by letter code EF and is equivalent to the frost climate of C. W. Thornthwaite's classifications and to Nordenskjöld's (1928) high arctic climate. (Also called frost climate, ice-cap climate.)
A galaxy cluster of about 12,000 members about 250 million light-years (redshift z = 0.0176) away, covering 4° of sky in the constellation Perseus. It is dominated by elliptical galaxies. At its cente
r lies the radio source Perseus A. Also known as Abell 426 (Abell catalog).