Delaware's First Frost: What You Need to Know

Delaware is bracing for its first frost of the year. The National Weather Service has issued a frost advisory for most of the state, excluding the beaches in Sussex. This advisory is in effect from 2 a. m. to 9 a. m. on October 25. Frost forms when temperatures drop to 32 degrees or lower. This can be harmful to sensitive outdoor plants. If left uncovered, these plants may not survive the cold. The National Weather Service warns that frost can develop when temperatures are between 38 and 42 degrees. Areas with temperatures between 33 and 37 degrees may see patchy frost. Widespread frost is likely when temperatures drop to 32 degrees or below. The upcoming weather forecast for Delaware looks chilly. Wilmington, Dover, and Georgetown are expected to see lows in the 30s and 40s. Highs will range from the mid-50s to low 60s. The cold weather is expected to stick around through the weekend and into next week. Several factors contribute to frost formation. Clear skies allow heat to escape into the atmosphere. Light winds create a thin layer of super-cooled air near the ground. Cool temperatures with moisture promote ice crystal development. Local topography also plays a role. Cold air settles in valleys, making frost more likely in these areas. The first frost in Delaware usually occurs in late October or early November. However, the exact date can vary depending on the location. For example, the average first frost in Bear is October 28, while in Hockessin, it's October 19. Delaware has seen some notably cold Octobers in the past. The coldest October on record was in 1907, with an average temperature of 51 degrees. Other chilly Octobers include 1895, 1988, and 1925. These months saw average temperatures ranging from 51 to 52 degrees.