Weather & Climate in Dilley, OR

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

Dilley experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 41°F in January while summers reach 69°F in July. The area gets 258 sunny days per year, above the national average. Air quality is rated Good with a median AQI of 32. The city sits at an elevation of 185 feet.

Temperature

41°F Jan (5°C) 69°F Jul (20°C)

Annual Average	53.7°F
	1% below US avg
January Average	41°F (5°C)
July Average	69°F (20°C)
Sunny Days	258 days/yr

Geography

Elevation	185 ft (56 m)
Area	0.8 sq mi (1.9 km²)
Population Density	275/sq mi
Coordinates	45.4917°N, 123.1223°W
Timezone	America/Los_Angeles
County	Washington County County
Nearest Airport	Portland International (PDX) 26 miles away

Precipitation & Snow

Wettest Month (Dec) 8.54"

Driest Month (Jul) 0.59"

Air Quality

AQI Median	32.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	96.0 / 100
Social Vulnerability	13.0 / 100
Community Resilience	74.3 / 100

Hazard Breakdown

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

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

Earthquake History

949 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.6.

Mar 25, 1993	4 km E of Scotts Mills, Oregon	M5.6	65 km	20 km
Aug 19, 2004	19 km W of Newport, Oregon	M4.7	130 km	27 km
Jun 29, 2002	6 km ENE of Government Camp, Oregon	M4.5	113 km	5 km
Feb 14, 2011	31 km S of Morton, Washington	M4.3	113 km	4 km
Jun 6, 2021	6 km NE of Government Camp, Oregon	M3.9	113 km	4 km
Oct 1, 2004	37 km NNE of Amboy, Washington	M3.9	106 km	-1 km
Apr 24, 2003	3 km NW of North Portland, Oregon	M3.9	34 km	17 km
Jan 3, 2018	37 km SSE of Morton, Washington	M3.9	118 km	10 km
Feb 8, 1995	9 km ESE of Hubbard, Oregon	M3.8	51 km	24 km
Jun 29, 2002	7 km NE of Government Camp, Oregon	M3.8	114 km	5 km
Aug 3, 2006	2 km WNW of Cherry Grove, Washington	M3.8	53 km	14 km
Oct 1, 2004	36 km NNE of Amboy, Washington	M3.7	106 km	-2 km
Aug 23, 2013	24 km SSE of Mossyrock, Washington	M3.7	109 km	14 km
Jun 8, 1993	5 km ESE of Scotts Mills, Oregon	M3.7	66 km	19 km
Jan 31, 2013	3 km ENE of Amboy, Washington	M3.7	73 km	6 km
Jul 31, 2006	37 km NNE of Amboy, Washington	M3.6	107 km	-1 km
Jul 25, 2006	37 km NNE of Amboy, Washington	M3.6	107 km	-1 km
Aug 5, 2006	37 km NNE of Amboy, Washington	M3.6	107 km	-1 km
Sep 30, 2004	37 km NNE of Amboy, Washington	M3.6	107 km	-1 km
Feb 24, 1999	8 km WSW of Molalla, Oregon	M3.6	54 km	34 km

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

Tornado History

73 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 6 fatalities, 305 injuries.

Date	Rating	Distance	Path	Fatalities
Apr 5, 1972	EF3	40 km	8.7 mi	6
Oct 14, 2016	EF2	69 km	0.7 mi	0
Dec 14, 2010	EF2	75 km	5.0 mi	0
Dec 8, 1993	EF2	27 km	6.0 mi	0
Dec 10, 2015	EF1	55 km	0.8 mi	0
Oct 23, 2014	EF1	72 km	1.3 mi	0
Jun 13, 2013	EF1	31 km	0.3 mi	0
Jan 10, 2008	EF1	40 km	10.1 mi	0
Jun 21, 2003	EF1	72 km	0.3 mi	0
Oct 9, 2000	EF1	47 km	0.1 mi	0
Oct 9, 2000	EF1	55 km	0.1 mi	0
Nov 12, 1991	EF1	30 km	0.2 mi	0
Nov 12, 1991	EF1	58 km	0.2 mi	0
Jun 29, 1989	EF1	56 km	1.6 mi	0
Mar 28, 1985	EF1	78 km	0.2 mi	0
Oct 13, 1984	EF1	56 km	3.0 mi	0
Aug 16, 1978	EF1	37 km	0.2 mi	0
Dec 12, 1975	EF1	57 km	2.0 mi	0
Oct 3, 1967	EF1	95 km	0.5 mi	0
Mar 8, 1960	EF1	83 km	1.0 mi	0

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

Tsunami History

1 tsunami recorded within 500 km. Highest wave on record: 250.0 m (820 ft).

Year	Location	Cause	Max Wave	Deaths	Distance
1980	WASHINGTON	Explosion	250.0 m	61	107 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

10 volcanoes within 200 km. Closest: West Crater (92 km).

Name	Type	Elevation	Last Eruption	Distance
West Crater	Volcanic field	1,329 m (4,360 ft)	-5750	92 km
St. Helens	Stratovolcano	2,549 m (8,363 ft)	2008	107 km
Hood	Stratovolcano	3,426 m (11,240 ft)	1866	112 km
Indian Heaven	Shield(s)	1,806 m (5,925 ft)	-6250	112 km
Jefferson	Stratovolcano	3,199 m (10,495 ft)	950	138 km
Adams	Stratovolcano	3,742 m (12,277 ft)	950	149 km
Sand Mountain Field	Pyroclastic cone(s)	1,664 m (5,459 ft)	-950	155 km
Belknap	Shield(s)	2,095 m (6,873 ft)	480	168 km
Rainier	Stratovolcano	4,392 m (14,409 ft)	1450	184 km
Three Sisters	Complex	3,159 m (10,364 ft)	440	185 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

13 wildfires (100+ acres) recorded within 100 km. Largest: BEACHIE CREEK (194,619 acres, 2020).

Year	Name	Acres Burned	Distance
2020	BEACHIE CREEK	194,619	91 km
2020	RIVERSIDE	138,190	81 km
2017	EAGLE CREEK	48,816	93 km
2020	BIG HOLLOW	24,243	96 km
2014	36 PIT	5,838	79 km
1987	ROCKHOUSE	5,011	71 km
2022	SIOUXON	2,551	93 km
2020	ECHO MTN COMPLEX	2,161	83 km
2023	CAMP CREEK	2,056	81 km
2022	NAKIA CREEK	1,737	68 km
2020	DOWTY RD	1,424	60 km
1991	FALLS	1,389	76 km
1987	87552212	1,166	80 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	41°F (5°C)	7.8 in
February	42°F (6°C)	6.3 in
March	46°F (8°C)	5.3 in
April	49°F (10°C)	3.3 in
May	55°F (13°C)	2.2 in
June	60°F (15°C)	1.5 in
July	69°F (20°C)	0.6 in	Warmest, Driest
August	65°F (18°C)	0.8 in
September	61°F (16°C)	1.8 in
October	52°F (11°C)	3.5 in
November	44°F (7°C)	7.6 in
December	39°F (4°C)	8.5 in	Coldest, Wettest

Dilley has a seasonal temperature swing of 29°F / from 39°F in December to 69°F in July. Total annual precipitation is 49.1 inches, with December being the wettest month (8.5") and July the driest (0.6").

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