Weather & Climate in Severn, MD

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

Severn enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 34°F in January while summers reach 78°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 45.0 inches. The area receives 19.3 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 180 feet.

Temperature

34°F Jan (1°C) 78°F Jul (26°C)

Annual Average	56.2°F
	4% above US avg
January Average	34°F (1°C)
July Average	78°F (26°C)
Sunny Days	293 days/yr

Geography

Elevation	180 ft (55 m)
Area	18.3 sq mi (47.5 km²)
Population Density	3,165/sq mi
Coordinates	39.1355°N, 76.6956°W
Timezone	America/New_York
County	Baltimore city County
Nearest Airport	Baltimore/Washington International Thurgood Marshall (BWI) 3 miles away

Precipitation & Snow

Annual Rainfall 45.0"

18% above US avg

Snowfall 19.3"

Wettest Month (May) 4.53"

Driest Month (Feb) 2.91"

Air Quality

AQI Median	41.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	95.0 / 100
Social Vulnerability	74.1 / 100
Community Resilience	78.8 / 100

Hazard Breakdown

Tornado	Relatively High
Hurricane	Relatively Moderate
Earthquake	Relatively Moderate
Wildfire	Very Low
Flood	Relatively High
Hail	Relatively Moderate
Strong Wind	Relatively High
Heat Wave	Relatively High
Winter Weather	Very High
Lightning	Relatively High
Ice Storm	Relatively Moderate
Drought	No Rating
Cold Wave	Relatively High
Landslide	Very Low
Coastal Flood	Relatively Moderate

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

Earthquake History

28 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.6.

Jan 16, 1994	2 km W of Sinking Spring, Pennsylvania	M4.6	144 km	5 km
Jan 16, 1994	0 km E of Sinking Spring, Pennsylvania	M4.2	145 km	5 km
Jul 16, 2010	5 km NNW of Barnesville, Maryland	M3.6	63 km	7 km
Oct 23, 1990	3 km W of Hancocks Bridge, New Jersey	M3.2	111 km	10 km
Jun 3, 2010	4 km ENE of Franklintown, Pennsylvania	M3.1	108 km	2 km
Jan 17, 2016	3 km NE of Ranson, West Virginia	M3.0	100 km	5 km
Nov 14, 1997	0 km S of Rothsville, Pennsylvania	M3.0	119 km	5 km
Apr 24, 2009	1 km S of Franklintown, Pennsylvania	M2.9	107 km	1 km
Jan 16, 1994	0 km SSE of Sinking Spring, Pennsylvania	M2.9	144 km	5 km
Sep 15, 2019	5 km ESE of East Berlin, Pennsylvania	M2.8	90 km	5 km
May 10, 1993	1 km NW of Whitfield, Pennsylvania	M2.8	147 km	5 km
Jul 1, 2009	3 km ESE of Pennsville, New Jersey	M2.8	119 km	5 km
Oct 25, 2009	4 km ENE of Franklintown, Pennsylvania	M2.8	110 km	1 km
Mar 15, 1993	5 km W of Columbia, Maryland	M2.7	21 km	5 km
Oct 28, 1994	1 km E of Mount Vernon, Maryland	M2.7	20 km	-
Mar 11, 1995	0 km ENE of Landisville, Pennsylvania	M2.7	110 km	5 km
Jan 25, 2015	4 km ESE of Downingtown, Pennsylvania	M2.6	131 km	2 km
Jan 13, 1990	6 km ENE of Eldersburg, Maryland	M2.6	36 km	5 km
Jun 25, 2021	2 km SE of Woodlawn, Maryland	M2.6	19 km	3 km
Jan 18, 1994	3 km SE of Clay, Pennsylvania	M2.6	125 km	5 km

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

Hurricane History

5 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.

Year	Name	Category	Max Wind	Closest
2011	Irene	Category 1	75 mph	187 km
2003	Isabel	Category 1	75 mph	285 km
1999	Floyd	Category 1	-	265 km
1986	Charley	Category 1	81 mph	233 km
1985	Gloria	Category 2	98 mph	207 km

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

Tornado History

485 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 12 fatalities, 466 injuries.

Date	Rating	Distance	Path	Fatalities
Apr 28, 2002	EF4	77 km	38.0 mi	3
Apr 28, 2002	EF3	87 km	18.0 mi	0
Sep 24, 2001	EF3	34 km	17.5 mi	2
Jul 19, 1996	EF3	47 km	2.2 mi	0
May 22, 1983	EF3	79 km	2.0 mi	0
Jun 7, 1980	EF3	93 km	1.5 mi	0
Sep 5, 1979	EF3	52 km	17.9 mi	1
Jan 26, 1978	EF3	88 km	0.7 mi	1
Apr 1, 1973	EF3	66 km	9.8 mi	0
Jun 9, 1961	EF3	10 km	0.1 mi	0
Apr 5, 1952	EF3	78 km	17.5 mi	0
Sep 1, 2021	EF2	33 km	11.4 mi	0
Sep 1, 2021	EF2	94 km	5.9 mi	0
Nov 2, 2018	EF2	47 km	5.5 mi	0
Jul 23, 2017	EF2	36 km	2.4 mi	0
Sep 18, 2004	EF2	69 km	2.0 mi	0
Sep 17, 2004	EF2	71 km	15.0 mi	0
Sep 17, 2004	EF2	79 km	3.0 mi	0
Sep 17, 2004	EF2	85 km	4.0 mi	0
May 2, 2002	EF2	83 km	4.5 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	-	-	148 km

Source: NOAA/NCEI Historical Tsunami Database.

Wildfire History

14 wildfires (100+ acres) recorded within 100 km. Largest: RETAINING ECOLOGICAL HEALTH (5,678 acres, 2004).

Year	Name	Acres Burned	Distance
2004	RETAINING ECOLOGICAL HEALTH	5,678	99 km
2014	BLACKWATER MARSH WUI BURNS FY14	5,433	100 km
2005	MARSH RX-FWS	4,380	99 km
1987	UNNAMED	1,692	98 km
2004	BLACKWATER HAZARD FUEL REDUCTION	1,518	92 km
2006	UNNAMED	1,260	99 km
1999	FB A 3	1,156	98 km
2011	COMPARTMENT E42 AND 43	991	97 km
1999	NCO	816	88 km
2007	UNNAMED	782	98 km
2007	L 1 J 2 FB B 1 FB F 1	736	100 km
2007	UNNAMED	713	99 km
2001	A 1 M 2	594	93 km
2005	A 1	561	93 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	34°F (1°C)	3.4 in	Coldest
February	36°F (2°C)	2.9 in	Driest
March	44°F (7°C)	4.0 in
April	54°F (12°C)	3.4 in
May	64°F (18°C)	4.5 in	Wettest
June	72°F (22°C)	3.7 in
July	78°F (26°C)	4.2 in	Warmest
August	75°F (24°C)	4.0 in
September	69°F (20°C)	4.0 in
October	57°F (14°C)	3.4 in
November	47°F (8°C)	3.6 in
December	38°F (3°C)	3.5 in

Severn has a seasonal temperature swing of 44°F / from 34°F in January to 78°F in July. Total annual precipitation is 44.5 inches, with May being the wettest month (4.5") and February the driest (2.9").

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