Weather & Climate in Chantilly, VA

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

Chantilly enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 34°F in January while summers reach 77°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 43.2 inches. The area receives 21.0 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 35. The city sits at an elevation of 295 feet.

Temperature

34°F Jan (1°C) 77°F Jul (25°C)

Annual Average	55.7°F
	3% above US avg
January Average	34°F (1°C)
July Average	77°F (25°C)
Sunny Days	293 days/yr

Geography

Elevation	295 ft (90 m)
Area	12.1 sq mi (31.4 km²)
Population Density	1,979/sq mi
Coordinates	38.8892°N, 77.4421°W
Timezone	America/New_York
County	Fairfax city County
Nearest Airport	Washington Dulles International (IAD) 3 miles away

Precipitation & Snow

Annual Rainfall 43.2"

14% above US avg

Snowfall 21.0"

Wettest Month (May) 3.98"

Driest Month (Feb) 2.68"

Air Quality

AQI Median	35.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very Low
Risk Score	5.3 / 100
Social Vulnerability	10.6 / 100
Community Resilience	75.8 / 100

Hazard Breakdown

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

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

Earthquake History

45 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.8.

Aug 23, 2011	11 km SSW of Mineral, Virginia	M5.8	117 km	6 km
Aug 25, 2011	8 km SW of Mineral, Virginia	M4.5	114 km	7 km
Aug 24, 2011	11 km SSW of Mineral, Virginia	M4.2	117 km	0 km
Mar 15, 1991	7 km NNW of Goochland, Virginia	M3.8	134 km	16 km
May 5, 2003	Virginia	M3.6	148 km	13 km
Jul 16, 2010	5 km NNW of Barnesville, Maryland	M3.6	41 km	7 km
Aug 24, 2011	16 km NNW of Goochland, Virginia	M3.4	126 km	0 km
Sep 1, 2011	7 km SSW of Mineral, Virginia	M3.4	113 km	3 km
Sep 22, 2001	5 km E of Pantops, Virginia	M3.2	127 km	0 km
Jan 30, 2012	9 km SSE of Louisa, Virginia	M3.1	115 km	3 km
Jun 3, 2010	4 km ENE of Franklintown, Pennsylvania	M3.1	139 km	2 km
Jan 17, 2016	3 km NE of Ranson, West Virginia	M3.0	58 km	5 km
Oct 2, 2010	10 km NNW of Ashland, Virginia	M3.0	115 km	19 km
Oct 12, 2011	9 km S of Louisa, Virginia	M3.0	116 km	4 km
Mar 26, 2012	13 km S of Louisa, Virginia	M3.0	119 km	9 km
Apr 24, 2009	1 km S of Franklintown, Pennsylvania	M2.9	135 km	1 km
Sep 15, 2019	5 km ESE of East Berlin, Pennsylvania	M2.8	124 km	5 km
Aug 23, 2011	9 km SSW of Mineral, Virginia	M2.8	115 km	0 km
Mar 15, 2015	6 km SW of Mineral, Virginia	M2.8	112 km	5 km
Apr 21, 1998	1 km NNW of Free Union, Virginia	M2.8	126 km	2 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	230 km
2003	Isabel	Category 1	75 mph	245 km
1999	Floyd	Category 1	—	261 km
1986	Charley	Category 1	81 mph	257 km
1985	Gloria	Category 2	98 mph	261 km

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

Tornado History

465 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 9 fatalities, 369 injuries.

Date	Rating	Distance	Path	Fatalities
Apr 28, 2002	EF4	44 km	38.0 mi	3
Sep 24, 2001	EF4	59 km	10.0 mi	0
Sep 17, 2004	EF3	52 km	9.0 mi	0
Sep 24, 2001	EF3	40 km	17.5 mi	2
Jul 19, 1996	EF3	79 km	2.2 mi	0
Oct 18, 1990	EF3	80 km	3.5 mi	0
May 22, 1983	EF3	92 km	2.0 mi	0
Sep 5, 1979	EF3	34 km	17.9 mi	1
Jan 26, 1978	EF3	45 km	0.7 mi	1
Mar 21, 1976	EF3	99 km	5.6 mi	0
Apr 1, 1973	EF3	14 km	9.8 mi	0
Jun 9, 1961	EF3	79 km	0.1 mi	0
Sep 1, 2021	EF2	73 km	11.4 mi	0
Nov 2, 2018	EF2	56 km	5.5 mi	0
Jul 23, 2017	EF2	95 km	2.4 mi	0
May 8, 2008	EF2	59 km	3.4 mi	0
Sep 17, 2004	EF2	80 km	7.0 mi	0
Sep 17, 2004	EF2	7 km	15.0 mi	0
Sep 17, 2004	EF2	42 km	8.0 mi	0
Sep 17, 2004	EF2	30 km	4.0 mi	0

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

Wildfire History

13 wildfires (100+ acres) recorded within 100 km. Largest: PINNACLES (24,792 acres, 2000).

Year	Name	Acres Burned	Distance
2000	PINNACLES	24,792	82 km
2019	UNNAMED	2,460	99 km
2012	NEIGHBOR MTN FIRE	1,986	83 km
2011	SMITH RUN FIRE	1,908	64 km
1999	BOOTEN GAP	1,652	99 km
2006	CARDINAL	1,345	100 km
2012	POINT 2	1,126	78 km
2024	ROCKY BRANCH	1,018	80 km
2024	SERENITY RIDGE FIRE	877	94 km
1999	NCO	816	38 km
2019	KENNEDY PEAK	769	90 km
1984	UNNAMED	696	77 km
2022	UNNAMED	618	93 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	34°F (1°C)	2.8 in	Coldest
February	36°F (2°C)	2.7 in	Driest
March	45°F (7°C)	3.4 in
April	55°F (13°C)	3.1 in
May	64°F (18°C)	4.0 in	Wettest
June	73°F (23°C)	3.7 in
July	77°F (25°C)	3.5 in	Warmest
August	76°F (24°C)	3.7 in
September	69°F (20°C)	3.6 in
October	57°F (14°C)	3.2 in
November	47°F (8°C)	3.4 in
December	38°F (3°C)	3.1 in

Chantilly has a seasonal temperature swing of 43°F / from 34°F in January to 77°F in July. Total annual precipitation is 40.1 inches, with May being the wettest month (4.0") and February the driest (2.7").

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