Since almost all of Delaware is a part of the Atlantic Coastal Plain, the climate is moderated by the effects of the ocean.  Delaware flooding is very common along with rising flood water.  The state is somewhat of a transitional zone between a humid subtropical climate and a continental climate. Despite its small size (roughly 100 miles from its northernmost to southernmost points), there is significant variation in mean temperature and amount of snowfall between Sussex County and New Castle County. The southern portion of the State has a somewhat milder climate and a longer growing season than the northern portion of the State. Furthermore, the transitional climate of Delaware supports a surprising variety of vegetation. At Trap Pond State Park in Sussex County, bald cypress grow—this is thought to be one of the northernmost stands of these trees. The vegetation in New Castle County, on the other hand, is more typical of that of the northeastern United States. All parts of Delaware have relatively hot, humid summers. While Sussex and Kent Counties are considered to fall in the humid subtropical climate zone, there is some debate about whether northern New Castle County falls in the humid subtropical climate zone or warm continental climate.

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