The summer time solstice (June 21) is handed, however temperatures proceed rising for about one other month due to the cumulative impact of the summer time season. Why does the identical impact proceed after the winter solstice (Dec. 21), when temperatures don’t begin their upswing for an additional month?
Chicago’s temperatures proceed rising for about 5 weeks after the summer time solstice as a result of, on common, incoming warmth from daylight continues to be larger than warmth misplaced into area. Incoming warmth (within the Northern Hemisphere) reaches its most on the summer time solstice, then begins reducing, however it takes about 5 weeks for it to be overtaken by (outgoing) warmth loss. The other happens on the winter solstice (about Dec. 21). Incoming warmth begins to extend after the winter solstice, however warmth misplaced into area continues to be higher than incoming warmth for an additional month.