Weather & Climate in Sunnyslope, WA

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

Sunnyslope experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 30°F in January while summers reach 73°F in July. The area gets 273 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 13.6 inches (drier than the 38-inch national average). The area receives 39.5 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 28 / among the cleanest air in the country. The city sits at an elevation of 1,958 feet.

Temperature

30°F Jan (-1°C) 73°F Jul (23°C)

Annual Average	51.4°F
	5% below US avg
January Average	30°F (-1°C)
July Average	73°F (23°C)
Sunny Days	273 days/yr

Geography

Elevation	1,958 ft (597 m)
Area	3.9 sq mi (10.0 km²)
Population Density	459/sq mi
Coordinates	47.5048°N, 120.3532°W
Timezone	America/Los_Angeles
County	Chelan County County
Nearest Airport	Grant County International (MWH) 53 miles away

Precipitation & Snow

Annual Rainfall 13.6"

64% below US avg

Snowfall 39.5"

Wettest Month (Dec) 4.29"

Driest Month (Jul) 0.55"

Air Quality

AQI Median	28.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Moderate
Risk Score	90.9 / 100
Social Vulnerability	48.6 / 100
Community Resilience	70.4 / 100

Hazard Breakdown

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

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

Earthquake History

493 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.4.

May 3, 1996	8 km NNE of Lake Marcel-Stillwater, Washington	M5.4	118 km	4 km
Jun 24, 1997	16 km WNW of Malott, Washington	M4.6	102 km	10 km
Jul 12, 2019	2 km S of Roosevelt, Washington	M4.6	131 km	29 km
Jun 18, 1994	11 km SE of Skykomish, Washington	M4.3	70 km	-1 km
Jun 27, 2013	25 km N of Leavenworth, Washington	M4.3	44 km	8 km
Feb 18, 2015	15 km ENE of Cle Elum, Washington	M4.2	41 km	4 km
Sep 1, 2015	15 km N of Nespelem Community, Washington	M4.2	134 km	9 km
May 20, 1995	15 km NNE of Ashford, Washington	M4.1	139 km	12 km
Aug 16, 2004	16 km ENE of Packwood, Washington	M4.0	126 km	-1 km
Oct 9, 1998	20 km S of White Swan, Washington	M4.0	147 km	2 km
Aug 8, 2023	9 km NNE of Snoqualmie, Washington	M3.9	107 km	16 km
Sep 10, 1994	2 km SE of Enumclaw, Washington	M3.9	127 km	17 km
Apr 15, 1991	4 km SE of Pateros, Washington	M3.9	69 km	11 km
Sep 12, 2015	3 km NE of North Bend, Washington	M3.9	105 km	19 km
Mar 29, 2010	10 km NE of Cliffdell, Washington	M3.8	72 km	1 km
Jan 1, 1997	14 km NNE of Selah, Washington	M3.7	81 km	18 km
Jul 4, 1997	8 km NNE of Waterville, Washington	M3.7	33 km	7 km
Jul 13, 1995	13 km ENE of Ashford, Washington	M3.7	138 km	7 km
Sep 4, 2011	14 km N of Richland, Washington	M3.7	147 km	2 km
Apr 6, 2025	12 km E of Greenwater, Washington	M3.7	93 km	9 km

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

Tornado History

11 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.

Date	Rating	Distance	Path	Fatalities
Apr 5, 1972	EF2	96 km	0.1 mi	0
May 30, 1987	EF1	84 km	1.0 mi	0
May 1, 2024	EF0	53 km	0.4 mi	0
May 26, 2023	EF0	79 km	0.4 mi	0
Jul 22, 2016	EF0	77 km	0.2 mi	0
May 19, 2010	EF0	97 km	0.2 mi	0
May 9, 2005	EF0	99 km	0.2 mi	0
May 19, 2004	EF0	10 km	0.3 mi	0
May 9, 1999	EF0	95 km	—	0
Jul 4, 1992	EF0	25 km	0.1 mi	0
Jul 1, 1979	EF0	85 km	0.1 mi	0

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

Nearby Volcanoes

4 volcanoes within 200 km. Closest: Glacier Peak (88 km).

Name	Type	Elevation	Last Eruption	Distance
Glacier Peak	Stratovolcano	3,213 m (10,541 ft)	1700	88 km
Rainier	Stratovolcano	4,392 m (14,409 ft)	1450	129 km
Adams	Stratovolcano	3,742 m (12,277 ft)	950	168 km
Baker	Stratovolcano(es)	3,285 m (10,778 ft)	1880	178 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: CARLTON COMPLEX (276,249 acres, 2014).

Year	Name	Acres Burned	Distance
2014	CARLTON COMPLEX	276,249	88 km
2020	PEARL HILL	217,720	64 km
1994	TYEE CREEK	123,618	35 km
2021	SCHNEIDER SPRINGS	114,743	93 km
2013	COLOCKUM TARPS	79,279	40 km
2020	EVANS CANYON	76,288	78 km
1996	COLD CREEK	72,859	95 km
2015	WOLVERINE	66,329	73 km
2018	BOYLSTON	66,292	75 km
2012	TABLE MOUNTAIN COMPLEX	65,887	28 km
2015	BLACK CANYON	61,379	57 km
2001	REX CREEK COMPLEX (REX CREEK)	54,456	74 km
2018	CRESCENT MOUNTAIN	53,258	98 km
2017	NORSE PEAK	51,017	97 km
2024	RETREAT	44,681	100 km
2018	COUGAR CREEK	42,681	36 km
2002	DEER POINT	41,348	58 km
2017	JOLLY MOUNTAIN	38,159	50 km
2004	POT PEAK-SISI RIDGE COMPLEX	37,603	54 km
1988	DINKELMAN	36,246	15 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	30°F (-1°C)	4.1 in
February	30°F (-1°C)	2.6 in
March	37°F (3°C)	1.9 in
April	44°F (6°C)	1.3 in
May	51°F (11°C)	1.1 in
June	58°F (15°C)	1.0 in
July	73°F (23°C)	0.6 in	Warmest, Driest
August	65°F (18°C)	0.8 in
September	57°F (14°C)	0.9 in
October	46°F (8°C)	1.6 in
November	33°F (1°C)	3.5 in
December	25°F (-4°C)	4.3 in	Coldest, Wettest

Sunnyslope has a seasonal temperature swing of 48°F / from 25°F in December to 73°F in July. Total annual precipitation is 23.6 inches, with December being the wettest month (4.3") and July the driest (0.6").

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