It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, said: Hell complained to its Lord, saying: O my Lord! Some parts of me are consuming other parts, so allow me to breathe. Allah Almighty allowed it to breathe twice every year: once in the winter and once in the summer. The intense cold you feel is from the severe cold of Hell, and the intense heat you feel is from the heat or steam of Hell.