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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.
Delaware-Climate. Delaware's climate is temperate and humid. The normal daily mean temperature in Wilmington is 54Â°F (12Â°C), ranging from 31Â°F (â1Â°C) in January to 76Â°F (24Â°C) in July.Both the record low and the record high temperatures for the state were established at Millsboro: â17Â°F (â27Â°C) on 17 January 1893 and 110Â°F (43Â°C) on 21 July 1930.The average annual precipitation (1971â2000) was 42.8 in (108.7 cm) during 1971â2000; about 21 in (53 cm) of snow falls each year.he normal daily mean temperature in Wilmington is 54Â°F (12Â°C), ranging from 31Â°F (â1Â°C) in January to 76Â°F (24Â°C) in July.