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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.
Winter Temperatures. Preliminary data indicates that Delawareâs winter temperature was below the 1981-2010 normal for the third time in the last five years.The Statewide mean winter temperature of 34.9Â°F was 1.4Â°F below the 30-year normal of 36.3Â°F.Although slightly cooler than normal, this winterâs temperature was actually near the middle of all winters since records began in 1895 (Figure 1).he Statewide mean winter temperature of 34.9Â°F was 1.4Â°F below the 30-year normal of 36.3Â°F. Although slightly cooler than normal, this winterâs temperature was actually near the middle of all winters since records began in 1895 (Figure 1).