Weather & Climate in Henlopen Acres, DE

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Henlopen Acres enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 38°F in January while summers reach 79°F in July. The area gets 293 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 47.3 inches (wetter than the 38-inch national average). The area receives 10.5 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 17 feet.

Temperature

38°F Jan (3°C) 79°F Jul (26°C)

Annual Average	58.5°F
	8% above US avg
January Average	38°F (3°C)
July Average	79°F (26°C)
Sunny Days	293 days/yr

Geography

Elevation	17 ft (5 m)
Area	0.3 sq mi (0.7 km²)
Population Density	735/sq mi
Coordinates	38.7256°N, 75.0850°W
Timezone	America/New_York
County	Sussex County County
Nearest Airport	Salisbury-Ocean City Wicomico Regional (SBY) 35 miles away

Precipitation & Snow

Annual Rainfall 47.3"

24% above US avg

Snowfall 10.5"

Wettest Month (Aug) 4.21"

Driest Month (Feb) 3.15"

Air Quality

AQI Median	41.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Moderate
Risk Score	94.2 / 100
Social Vulnerability	70.4 / 100
Community Resilience	59.8 / 100

Hazard Breakdown

Tornado	Relatively Low
Hurricane	Relatively High
Earthquake	Relatively Low
Wildfire	Relatively Low
Flood	Relatively Moderate
Hail	Relatively Low
Strong Wind	Relatively High
Heat Wave	Relatively Moderate
Winter Weather	Very High
Lightning	Relatively High
Ice Storm	Relatively Moderate
Drought	Relatively Moderate
Cold Wave	Relatively High
Landslide	Very Low
Coastal Flood	Very High

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

7 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.2.

Oct 23, 1990	3 km W of Hancocks Bridge, New Jersey	M3.2	95 km	10 km
Jul 1, 2009	3 km ESE of Pennsville, New Jersey	M2.8	108 km	5 km
Oct 28, 1994	1 km E of Mount Vernon, Maryland	M2.7	146 km	—
Jan 25, 2015	4 km ESE of Downingtown, Pennsylvania	M2.6	150 km	2 km
Jul 5, 1996	2 km NW of Chester Heights, Pennsylvania	M2.6	136 km	18 km
Feb 9, 2023	29 km E of Greenbackville, Virginia	M2.6	77 km	11 km
Feb 26, 1993	2 km SW of Marlton, New Jersey	M2.5	129 km	5 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Hurricane History

10 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.

Year	Name	Category	Max Wind	Closest
2014	Arthur	Category 1	92 mph	187 km
2012	Sandy	Category 2	92 mph	171 km
2011	Irene	Category 1	75 mph	70 km
2010	Earl	Category 1	86 mph	279 km
1999	Floyd	Category 1	—	232 km
1998	Bonnie	Category 1	86 mph	236 km
1993	Emily	Category 3	115 mph	218 km
1991	Bob	Category 3	115 mph	168 km
1986	Charley	Category 1	81 mph	148 km
1985	Gloria	Category 2	98 mph	62 km

Source: NOAA IBTrACS (Category 1+, 1980–2026).

Tornado History

137 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 4 fatalities, 92 injuries.

Date	Rating	Distance	Path	Fatalities
Apr 1, 2023	EF3	48 km	14.3 mi	1
Aug 4, 2020	EF2	55 km	35.8 mi	0
Aug 4, 2020	EF2	66 km	1.3 mi	0
Aug 4, 2020	EF2	75 km	3.8 mi	0
Apr 15, 2019	EF2	47 km	6.2 mi	0
May 18, 1995	EF2	81 km	10.0 mi	0
Jul 31, 1992	EF2	50 km	4.0 mi	0
May 10, 1990	EF2	84 km	0.5 mi	0
Jul 21, 1987	EF2	82 km	0.5 mi	0
Jul 18, 1984	EF2	44 km	1.5 mi	0
Jul 21, 1983	EF2	74 km	1.0 mi	2
Jun 9, 1977	EF2	48 km	0.2 mi	0
Mar 21, 1976	EF2	91 km	0.2 mi	0
Jul 13, 1975	EF2	87 km	1.5 mi	0
Aug 27, 1971	EF2	26 km	28.7 mi	0
Jul 30, 1971	EF2	92 km	8.3 mi	0
Nov 4, 1970	EF2	90 km	0.5 mi	0
Jan 27, 1967	EF2	54 km	0.5 mi	0
May 6, 1956	EF2	62 km	0.2 mi	0
Aug 12, 1955	EF2	22 km	2.7 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

1 tsunami recorded within 500 km.

Year	Location	Cause	Max Wave	Deaths	Distance
1840	PHILADELPHIA, PENNSYLVANIA	Earthquake	—	—	120 km

Source: NOAA/NCEI Historical Tsunami Database.

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: BESTPITCH (7,743 acres, 2017).

Year	Name	Acres Burned	Distance
2017	BESTPITCH	7,743	88 km
2004	RETAINING ECOLOGICAL HEALTH	5,678	94 km
2014	BLACKWATER MARSH WUI BURNS FY14	5,433	92 km
2005	MARSH RX-FWS	4,380	90 km
2007	GUINEA MARSH	4,173	86 km
2009	DOCTORS CREEK	3,686	86 km
1999	FB R O C I	3,525	92 km
2019	MDBWR-FY19-RX-MDWHS SUPPORT	3,197	92 km
2011	COMPARTMENT J	2,775	92 km
2005	ISLAND CREEK	2,729	86 km
2004	UNNAMED	2,156	86 km
1992	UNNAMED	2,038	87 km
2005	VEGETATION RESEARCH	1,926	86 km
2011	THOROFARE	1,850	86 km
1987	UNNAMED	1,692	94 km
2004	ROBBINS FIRE	1,612	94 km
1988	SLAU BCH 2	1,578	26 km
2020	SPLIT DITCH	1,518	66 km
2004	BLACKWATER HAZARD FUEL REDUCTION	1,518	96 km
2014	RAILROAD	1,431	66 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	38°F (3°C)	3.7 in
February	37°F (3°C)	3.2 in	Coldest, Driest
March	44°F (7°C)	4.1 in
April	53°F (12°C)	3.4 in
May	63°F (17°C)	3.7 in
June	71°F (22°C)	3.3 in
July	79°F (26°C)	3.6 in	Warmest
August	75°F (24°C)	4.2 in	Wettest
September	69°F (21°C)	3.5 in
October	58°F (15°C)	3.3 in
November	49°F (9°C)	3.2 in
December	40°F (4°C)	3.6 in

Henlopen Acres has a seasonal temperature swing of 42°F / from 37°F in February to 79°F in July. Total annual precipitation is 42.8 inches, with August being the wettest month (4.2") and February the driest (3.2").

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