Delaware Climate Information

The State of Delaware lies along the Atlantic coast of the United States, occupying the northern two-thirds of the Delmarva Peninsula. It is the second smallest of the United States with a land area of 1,982 mi². It is surrounded by water bodies including the Atlantic Ocean and Delaware Bay to the east, and Chesapeake Bay to the west.

The State is situated in a transition zone between humid subtropical climate conditions to the south and humid continental conditions to the north. The moderating effects of the surrounding water bodies lessen temperature extremes compared to nearby interior locations. Even so, the State has a continental climate, with cold winter temperatures, hot summers and ample precipitation throughout the year. However, annual precipitation amounts can vary greatly from one year to another.

Mean annual temperatures across the State range from 54.0 ° F in northern New Castle County to 58.1 ° F along the Atlantic coast of southern Delaware. Average annual precipitation is approximately 45” statewide.

The State is often affected by seasonally occurring severe weather including winter and spring nor-easters that can drop heavy snow and cause coastal flooding, autumn tropical systems with high winds, coastal flooding and heavy rainfall and spring and summer severe thunderstorms.

Delaware Climate Normals

All-Time Climate Extremes for DE

Variable Value Location Date Station ID Status
24-hr Precipitation 8.50 in. Dover July 13, 1975 072730 E
24-hr Snow Fall 25.0 in. Dover February 19, 1979 072730 E
Snow Depth 25 in. Bridgeville February 19, 1979 071330 N1
Wilmington NCC AP February 18, 2003 13781
Maximum Temperature 110 °F Millsboro July 21, 1930 076020 E
Minimum Temperature -17 °F Millsboro January 17, 1893 076020 E

Credit: NOAA Climate Services and Monitoring Division. For more information, please visit

E - Value is unchanged from previous extremes tables last updated by NCDC between 1998 and 2006. Value exceeds all other valid values.
N - Value is changed from extremes tables last updated by NCDC between 1998 and 2006. Value exceeds all other valid values.
1 - Value ties values from earlier dates.

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Delaware Environmental Observing System
Delaware Geological Survey
UD College of Earth, Ocean, and Environment