Heat in Delaware

Events

216

Deaths

8

Injuries

51

Damage

None recorded

• Heat in Delaware, July 4 to 6, 19994 deaths · 10 injured · 4 eventsA very strong and oppressive high pressure system that extended from the surface to aloft gave Delaware a brutal heat wave that included the entire Independence Day weekend. There were four heat related deaths, two in New Castle County, two in Sussex County.
• Heat in Delaware, August 1 to 3, 20062 deaths · 5 injured · 4 eventsA strong area of high pressure anchored over the East Coast and the western Atlantic, resulted in a stretch of excessive heat for the entire region to start off August 2006.
• Excessive Heat and Heat in Delaware, July 15 to 20, 20131 death · 7 eventsThe most oppressive hot spell of the summer season affected Delaware from July 15th through the 20th. Widespread high temperatures reached into the mid 90s and the most oppressive days (combination of heat and humidity) occurred on the 18th and 19th.
• Heat in Delaware, June 18 to 19, 20141 death · 4 eventsThe first back-to-back days with high temperatures of 90 degrees or higher occurred across Delaware on the 17th and 18th. High temperatures were in the lower to mid 90s both days with the hottest weather on the 18th.
• Heat in Delaware, June 25 to 26, 19981 death · 3 eventsA two day hot spell brought some of the highest temperatures of the summer to the Delmarva Peninsula and ended abruptly with severe thunderstorms during the late afternoon and early evening of the 26th. The excessive heat caused the death of an 84-year-old Wilmington woman.
• Heat in Delaware, July 23 to 31, 199910 injured · 3 eventsA run of consecutive days with high temperatures in the 90s started in Delaware on July 23rd. It lasted as long as 16 days in some areas through August 7th.
• Heat in Delaware, July 20 to 24, 19988 injured · 4 eventsA heat wave affected Delaware during the work week of July 20th. The hottest day for the heat wave and the summer (in central and southern Delaware) was the 22nd. There were at least eight heat related injuries throughout the state.
• Heat in Delaware, June 8, 19968 injured · 1 eventThe combination of high temperatures near 90F and excessive humidity levels caused eight persons to suffer heat exhaustion during a day-long country music festival in Frawley Stadium near Wilmington.
• Heat in Delaware, June 7 to 9, 19995 injured · 4 eventsA large high pressure system over the southeastern United States pumped in a hot and humid air mass across the Delmarva Peninsula for three days. The hottest day was the 8th.
• Excessive Heat and Heat in Delaware, June 8 to 9, 20114 injured · 4 eventsUnseasonably hot weather for early June culminated on the 9th with high temperatures in the upper 90s and afternoon heat indices of around 105F in Delaware. While high temperatures were nearly the same on the 8th, humidity levels were higher on the 9th.
• Heat in Delaware, August 16 to 17, 19973 injured · 4 eventsThe weekend of August 16th and 17th brought some of the hottest and most humid air of the summer into Delaware. High temperatures in most places reached around 100 degrees, while dew point temperatures (an indication of how humid the air mass is) were well into the 70s.
• Heat in Delaware, December 1 to 6, 20018 eventsA strong ridge of high pressure over the western Atlantic Ocean and adjacent parts of the United States brought unseasonably and record breaking warm weather from November 30th through December 6th to Delaware.
• Heat in Delaware, May 19 to 21, 19964 eventsThe first and for many locations the only heat wave of the season occurred during the end of May. For many locations this heat wave contained the hottest temperatures of the year. No heat related deaths or injuries were reported.
• Heat in Delaware, July 12 to 19, 19974 eventsThe longest and hottest heat wave of the summer of 1997 brought up to 8 straight days of high temperatures of 90 degrees or higher to Delaware along with oppressive humidity and limited rainfall.
• Heat in Delaware, June 21 to 26, 19974 eventsThe first heat wave of 1997 brought the warmest weather in two years to the Delmarva Peninsula. The highest temperatures reached near or around the 100 degree mark in many places on the 25th and 26th.
• Heat in Delaware, January 3 to 6, 19974 eventsA persistent west to southwest flow throughout the start of 1997 led to unseasonably warm weather from the 3rd through the 6th across Delaware. The warmest days statewide were the 3rd and the 5th.
• Heat in Delaware, February 26 to 28, 19974 eventsA persistent west to southwest flow of air throughout the Eastern United States brought unseasonably warm air into Delaware from the afternoon of February 26th through March 2nd.
• Heat in Delaware, February 19 to 22, 19974 eventsA persistent west to southwest flow at all levels of the atmosphere brought unseasonably warm weather into the Northeast from the afternoon of the 19th through the 22nd. This warm spell ended rather abruptly with a strong cold frontal passage on the 22nd.
• Heat in Delaware, February 28, 19974 eventsFebruary 1997 was an unseasonably warm month for the Middle Atlantic States including Delaware. The monthly mean temperature of 38.9 degrees at the New Castle County Airport was 5.5 degrees above normal and the 8th warmest February of this century.
• Heat in Delaware, March 1 to 2, 19974 eventsA persistent west to southwest flow of air throughout the Eastern United States brought unseasonably warm air into Delaware from the afternoon of February 26th through March 2nd.
• Heat in Delaware, September 27, 19984 eventsA southwest flow of air brought another piece of the unseasonably hot air that affected the southern United States over the past couple of months over the area. High temperatures reached record breaking levels across much of the Delmarva Peninsula on the 27th.
• Heat in Delaware, November 28 to 30, 19984 eventsA very strong and persistent ridge of high pressure at all levels of the atmosphere remained anchored across the western Atlantic Ocean and the Middle and South Atlantic States from November 28th through December 7th.
• Heat in Delaware, January 31, 19984 eventsCourtesy of the warm spell at the start of the month and the lack of any prolonged invasions of arctic air the rest of the month, January 1998 was one of the ten warmest Januarys on record for the state of Delaware.
• Heat in Delaware, December 1 to 7, 19984 eventsA very strong and persistent ridge of high pressure at all levels of the atmosphere remained anchored across the western Atlantic Ocean and the Middle and South Atlantic States from November 28th through December 7th.
• Heat in Delaware, January 4 to 9, 19984 eventsA high pressure system over the Western Atlantic, in a position normally seen during the summer months, gave the Delmarva Peninsula six days of unseasonably warm weather during early January.

Heat everywhereEvery kind of event in Delaware

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.