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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.
Annual average temperatures, precipitation, snowfall, humidity and sunshine at cities and towns throughout Delaware are listed below.n the table below, the average number of Sunny Days in Delaware is the total days in a year when the sky is mostly clear. This includes the days when cloud covers up to 30% of the sky during daylight hours.