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Weather & Climate in Sisco Heights, WA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sisco Heights experiences four distinct seasons with an average annual temperature of 49°F (10°C). Winters average 38°F in January while summers reach 63°F in July. The area gets 233 sunny days per year, above the national average. Annual precipitation totals 49.0 inches (wetter than the 38-inch national average). The area receives 4.3 inches of snow annually. 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 416 feet.
Temperature
38°F Jan (3°C)
63°F Jul (17°C)
| Annual Average | 49.1°F |
| 9% below US avg | |
| January Average | 38°F (3°C) |
| July Average | 63°F (17°C) |
| Sunny Days | 233 days/yr |
Geography
| Elevation | 416 ft (127 m) |
| Area | 4.8 sq mi (12.5 km²) |
| Population Density | 213/sq mi |
| Coordinates | 48.1177°N, 122.1105°W |
| Timezone | America/Los_Angeles |
| County | Island County County |
| Nearest Airport | Seattle Paine Field International (PAE) 17 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 78.0 / 100 |
| Social Vulnerability | 36.8 / 100 |
| Community Resilience | 80.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Relatively High |
| Coastal Flood | Relatively Moderate |
| Tsunami | Very Low |
| Volcano | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
701 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.8.
| Feb 28, 2001 | 7 km SSE of Longbranch, Washington | M6.8 | 117 km | 52 km |
| May 3, 1996 | 8 km NNE of Lake Marcel-Stillwater, Washington | M5.4 | 43 km | 4 km |
| Jun 10, 2001 | 18 km N of Satsop, Washington | M5.0 | 148 km | 40 km |
| Jan 29, 1995 | 3 km WSW of Des Moines, Washington | M5.0 | 84 km | 15 km |
| Apr 14, 1990 | 4 km ENE of Deming, Washington | M5.0 | 81 km | 12 km |
| Jun 23, 1997 | 2 km NE of Enetai, Washington | M4.9 | 67 km | 13 km |
| Apr 25, 2003 | 26 km W of Brinnon, Washington | M4.8 | 98 km | 51 km |
| Jan 30, 2009 | 6 km ESE of Lofall, Washington | M4.7 | 51 km | 62 km |
| Jul 12, 2019 | 2 km S of Roosevelt, Washington | M4.6 | 28 km | 29 km |
| Mar 3, 2025 | 2025 Orcas Island, Washington | M4.5 | 75 km | 16 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 80 km | 0 km |
| Jun 18, 1994 | 11 km SE of Skykomish, Washington | M4.3 | 84 km | -1 km |
| Jul 22, 2001 | 4 km WSW of DuPont, Washington | M4.3 | 122 km | 52 km |
| Jun 27, 2013 | 25 km N of Leavenworth, Washington | M4.3 | 111 km | 8 km |
| Feb 18, 2015 | 15 km ENE of Cle Elum, Washington | M4.2 | 140 km | 4 km |
| Sep 21, 2002 | 9 km SW of Friday Harbor, Washington | M4.1 | 86 km | 23 km |
| May 20, 1995 | 15 km NNE of Ashford, Washington | M4.1 | 138 km | 12 km |
| Feb 23, 2017 | 11 km NE of Hoodsport, Washington | M4.1 | 99 km | 15 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 79 km | 3 km |
| Jun 15, 1994 | 1 km WNW of Hoodsport, Washington | M4.0 | 111 km | 44 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
17 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 injury.
| Date | Rating | Distance | Path | Fatalities |
| Dec 12, 1969 | EF3 | 72 km | 3.8 mi | 0 |
| Dec 18, 2018 | EF2 | 79 km | 1.4 mi | 0 |
| May 13, 1986 | EF2 | 12 km | 0.3 mi | 0 |
| Nov 24, 1970 | EF2 | 7 km | 0.3 mi | 0 |
| Jan 18, 2015 | EF1 | 95 km | 4.1 mi | 0 |
| May 18, 2005 | EF1 | 14 km | 0.2 mi | 0 |
| Dec 22, 1971 | EF1 | 82 km | 0.5 mi | 0 |
| Oct 26, 1971 | EF1 | 22 km | 3.0 mi | 0 |
| Sep 28, 1962 | EF1 | 70 km | 0.1 mi | 0 |
| Jun 16, 2006 | EF0 | 40 km | 0.5 mi | 0 |
| Jun 5, 2004 | EF0 | 16 km | 0.1 mi | 0 |
| Apr 27, 2004 | EF0 | 98 km | 2.7 mi | 0 |
| Jun 11, 2001 | EF0 | 65 km | — | 0 |
| Aug 24, 1997 | EF0 | 22 km | 0.5 mi | 0 |
| Jun 23, 1996 | EF0 | 96 km | 0.4 mi | 0 |
| Apr 9, 1991 | EF0 | 68 km | 0.8 mi | 0 |
| Aug 18, 1964 | EF0 | 69 km | 5.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
5 tsunamis recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1894 | PUYALLUP RIVER DELTA, TACOMA, WA | Meteorological | 3.0 m | 2 | 96 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 104 km |
| 1949 | PUGET SOUND, WA | Meteorological | 2.4 m | — | 96 km |
| 1949 | PUGET SOUND, WA | Eruption + Earthquake | — | 8 | 112 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 20 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
3 volcanoes within 200 km. Closest: Glacier Peak (74 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 74 km |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 77 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 143 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: BOLT CREEK (15,211 acres, 2022).
| Year | Name | Acres Burned | Distance |
| 2022 | BOLT CREEK | 15,211 | 65 km |
| 2023 | AIRPLANE LAKE | 7,576 | 80 km |
| 2023 | SOURDOUGH | 7,517 | 99 km |
| 2015 | GOODELL | 6,624 | 91 km |
| 2022 | SUIATTLE RIVER | 4,400 | 58 km |
| 2016 | BUCK CREEK | 4,199 | 91 km |
| 2022 | IRVING PEAK | 3,983 | 85 km |
| 2018 | MAPLE | 3,547 | 98 km |
| 2003 | MINERAL PARK | 3,010 | 82 km |
| 2022 | MCALLISTER CREEK | 2,581 | 95 km |
| 2003 | MAPLE | 2,420 | 94 km |
| 2022 | BOULDER LAKE | 2,347 | 60 km |
| 2020 | DOWNEY CREEK | 2,324 | 70 km |
| 2022 | LOCH KATRINE | 2,163 | 64 km |
| 2023 | DOME PEAK | 1,873 | 84 km |
| 2011 | BIG HUMP | 1,400 | 88 km |
| 2021 | NASON | 1,353 | 92 km |
| 2001 | REX CREEK COMPLEX (GLORY MOUNTAIN) | 1,331 | 91 km |
| 1990 | WHITE RIVER | 1,319 | 77 km |
| 1998 | UNNAMED | 1,174 | 66 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 38°F (3°C) | 6.1 in | Coldest |
| February | 42°F (5°C) | 4.5 in | |
| March | 45°F (7°C) | 4.8 in | |
| April | 49°F (9°C) | 3.9 in | |
| May | 54°F (12°C) | 3.1 in | |
| June | 59°F (15°C) | 2.6 in | |
| July | 63°F (17°C) | 1.6 in | Driest |
| August | 64°F (18°C) | 1.7 in | Warmest |
| September | 59°F (15°C) | 2.8 in | |
| October | 51°F (10°C) | 4.2 in | |
| November | 43°F (6°C) | 6.7 in | Wettest |
| December | 39°F (4°C) | 6.6 in |
Sisco Heights has a seasonal temperature swing of 26°F / from 38°F in January to 64°F in August. Total annual precipitation is 48.4 inches, with November being the wettest month (6.7") and July the driest (1.6").