Excessive Heat in Maryland

Events

282

Deaths

19

Injuries

2

Damage

None recorded

• Excessive Heat and Heat in Maryland, July 3, 20189 deaths · 17 eventsAn upper-level high along with surface high over the western Atlantic led to hot and humid conditions.
• Excessive Heat and Heat in Maryland, July 5, 20123 deaths · 6 eventsUpper-level high provided plenty of subsidence while a southerly flow continued over the area due to surface high pressure off the coast. The subsidence and southerly flow caused hot and humid conditions.
• Excessive Heat in Maryland, July 22, 20112 deaths · 14 eventsStrong upper-level high pressure built over the region during the 22nd. Surface high pressure over the Atlantic Ocean caused moist air to move into the region from the south.
• Excessive Heat in Maryland, June 9, 20082 deaths · 2 eventsA strong ridge of high pressure set up across the eastern United States for several days in early to mid June. High temperatures reached into the mid to upper 90s across lower southern Maryland on June 9.
• Excessive Heat and Heat in Maryland, July 20, 20191 death · 17 eventsTemperatures from the mid 90s to the lower 100s combined with dew points near 70 degrees to create dangerously high heat index values.
• Excessive Heat and Heat in Maryland, July 21, 20191 death · 17 eventsTemperatures from the mid 90s to around 100 degrees combined with dew points in the 70s to create dangerously high heat index values.
• Excessive Heat and Heat in Maryland, July 8, 20121 death · 7 eventsUpper-level high pressure built overhead while surface high pressure moved off the coast. A southerly flow combined with sunshine and subsidence for hot and humid conditions.
• Excessive Heat in Maryland, June 23 to 24, 20101 death · 5 eventsUnseasonably hot and humid weather enveloped the Maryland Eastern Shore on the 23rd and 24th. It culminated on the 24th with maximum temperatures of 95 to 100 degrees and afternoon heat indices of around 105F.
• Excessive Heat and Damaging Winds in Maryland, June 2, 20003 injured · $141,000 · 9 eventsDuring a hot and humid afternoon, a cold front crossed the region. This front triggered thunderstorms, some of which produced damaging winds, hail, and frequent lightning across central Maryland. In Carroll County, a wind gust of 45 MPH was recorded at Millers.
• Excessive Heat and Damaging Winds in Maryland, July 18, 2012$24,000 · 52 kt wind · 18 eventsA surface trough combined with moderate instability caused showers and thunderstorms to develop. There was enough instability for thunderstorms to produce damaging wind gusts and large hail.
• Excessive Heat and Heat in Maryland, July 19, 201917 eventsTemperatures from the mid 90s to near 100 degrees combined with dew points near 70 degrees to create dangerously high heat index values.
• Excessive Heat and Heat in Maryland, July 25, 201616 eventsA southwesterly flow around high pressure over the Atlantic pumped in plenty of moisture while hot conditions persisted due to an upper-level ridge of high pressure. The heat and humidity caused dangerous heat indices.
• Excessive Heat and Heat in Maryland, August 13, 201616 eventsA southerly flow around high pressure ushered in unseasonably hot and humid conditions.
• Excessive Heat and Heat in Maryland, July 15 to 20, 201315 eventsThe most oppressive hot spell of the summer season affected the Eastern Shore 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.
• Excessive Heat and Heat in Maryland, July 20, 202015 eventsA ridge of high pressure developed over the eastern United States and western Atlantic, allowing a southwesterly flow to bring plenty of tropical air northward. High temperatures plus high humidity resulted in heat indices in the 100-115 degree range.
• Excessive Heat in Maryland, January 2 to 4, 200014 eventsHigh pressure off the Southeast U.S. coast turned winds southerly over the Mid-Atlantic region on the 2nd, starting a conveyer belt of warm air that would remain over the region through the 4th. With ample sunshine, high temperatures reached the middle 60s to lower 70s.
• Excessive Heat and Heat in Maryland, July 21, 201113 eventsUpper-level high pressure provided enough subsidence to cause hot conditions on the 21st. Surface high pressure over the Atlantic caused moist air to move into the region from the south.
• Excessive Heat and Heat in Maryland, June 29, 201213 eventsPlenty of moisture from the Gulf of Mexico caused high humidity during the 29th. Upper-level high pressure along with sunshine caused extremely hot conditions. The combination of the heat and humidity caused heat indices to be near or above 105 degrees.
• Excessive Heat and Heat in Maryland, July 26, 201213 eventsHigh pressure off the coast allowed for a hot and humid air mass to remain over the Mid-Atlantic.
• Excessive Heat and Heat in Maryland, July 19, 201313 eventsHigh pressure was located over much of the eastern United States for a consecutive day and light southerly flow persisted all week which led to above normal temperatures and dew points in the mid 70s.
• Excessive Heat in Maryland, July 16, 202412 eventsHot and humid conditions overspread much of the region on July 15 and July 16, resulting in the hottest temperatures of the Summer in 2024. Heat index values reached and exceeded 100 to 110, with daily record high temperatures tied and set.
• Excessive Heat in Maryland, July 28, 202311 eventsThe combination of a strong upper-level high pressure over the central United States and moist southwest winds resulted in hot and humid conditions across the Mid-Atlantic that produced excessive heat conditions.
• Excessive Heat in Maryland, June 23, 202511 eventsA large area of high pressure across the region brought extreme heat and humidity to the Mid-Atlantic.
• Excessive Heat in Maryland, June 24, 20257 eventsA large area of high pressure across the region brought extreme heat and humidity to the Mid-Atlantic.
• Excessive Heat in Maryland, March 31, 20005 eventsMarch 2000 was an unseasonably warm and wet month across the Maryland Eastern Shore. The statewide monthly average temperature of 47.6 degrees was the 7th warmest March on record since 1895. Precipitation was above normal throughout the state, especially along the Eastern Shore.

Excessive Heat everywhereEvery kind of event in Maryland

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.