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Delaware enjoys a mild year-round climate with average monthly temperatures ranging from 78 degrees in summer to 32 degrees in winter.limate: Delaware enjoys a mild year-round climate with average monthly temperatures ranging from 78 degrees in summer to 32 degrees in winter. Temperatures along the coastline are usually warmer in winter and cooler, and more comfortable in summer.
The average length of the growing season based on minimum temperatures higher than 32 F, ranges from about 175 to 195 days. The lowest temperature of record for Delaware is -17 F, at Millsboro on January 17, 1893, came in a month which is quite likely the coldest ever known in Delaware and surrounding areas. Record Coldest year in Delaware - 1904 / Avg temperature 51.35 degrees. 2  Delaware average Summer temperature (June, July, August) - 74.2 F degrees, 16th warmest U.S. summer state. 3  Delaware average Winter temperature (December, January, February) - 36.1 F degrees, 34th coldest U.S. winter state.