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Weather & Climate in Lake Bosworth, WA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Lake Bosworth experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 35°F in January while summers reach 66°F in July. The area gets 166 sunny days per year, below the national average of 205. Annual precipitation totals 83.1 inches (wetter than the 38-inch national average). 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 625 feet.
Temperature
35°F Jan (2°C)
66°F Jul (19°C)
| Annual Average | 49.6°F |
| 8% below US avg | |
| January Average | 35°F (2°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 166 days/yr |
Geography
| Elevation | 625 ft (191 m) |
| Area | 1.3 sq mi (3.4 km²) |
| Population Density | 248/sq mi |
| Coordinates | 48.0555°N, 121.9820°W |
| Timezone | America/Los_Angeles |
| County | Snohomish County County |
| Nearest Airport | Seattle Paine Field International (PAE) 18 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.9 / 100 |
| Social Vulnerability | 13.4 / 100 |
| Community Resilience | 77.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Relatively High |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively High |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very High |
| Coastal Flood | Relatively Moderate |
| Tsunami | Very Low |
| Volcano | Relatively Moderate |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
744 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 | 115 km | 52 km |
| May 3, 1996 | 8 km NNE of Lake Marcel-Stillwater, Washington | M5.4 | 34 km | 4 km |
| Jan 29, 1995 | 3 km WSW of Des Moines, Washington | M5.0 | 80 km | 15 km |
| Apr 14, 1990 | 4 km ENE of Deming, Washington | M5.0 | 89 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 | 104 km | 51 km |
| Jan 30, 2009 | 6 km ESE of Lofall, Washington | M4.7 | 54 km | 62 km |
| Jul 12, 2019 | 2 km S of Roosevelt, Washington | M4.6 | 21 km | 29 km |
| Mar 3, 2025 | 2025 Orcas Island, Washington | M4.5 | 87 km | 16 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 88 km | 0 km |
| Jun 18, 1994 | 11 km SE of Skykomish, Washington | M4.3 | 72 km | -1 km |
| Jul 22, 2001 | 4 km WSW of DuPont, Washington | M4.3 | 120 km | 52 km |
| Jun 27, 2013 | 25 km N of Leavenworth, Washington | M4.3 | 100 km | 8 km |
| Feb 18, 2015 | 15 km ENE of Cle Elum, Washington | M4.2 | 129 km | 4 km |
| May 20, 1995 | 15 km NNE of Ashford, Washington | M4.1 | 131 km | 12 km |
| Sep 21, 2002 | 9 km SW of Friday Harbor, Washington | M4.1 | 97 km | 23 km |
| Feb 23, 2017 | 11 km NE of Hoodsport, Washington | M4.1 | 101 km | 15 km |
| Jun 15, 1994 | 1 km WNW of Hoodsport, Washington | M4.0 | 114 km | 44 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 87 km | 3 km |
| Apr 3, 1990 | 3 km ENE of Deming, Washington | M4.0 | 88 km | 1 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
19 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 injury.
| Date | Rating | Distance | Path | Fatalities |
| Dec 12, 1969 | EF3 | 69 km | 3.8 mi | 0 |
| Dec 18, 2018 | EF2 | 78 km | 1.4 mi | 0 |
| May 13, 1986 | EF2 | 19 km | 0.3 mi | 0 |
| Nov 24, 1970 | EF2 | 17 km | 0.3 mi | 0 |
| Jan 18, 2015 | EF1 | 93 km | 4.1 mi | 0 |
| Sep 6, 2009 | EF1 | 97 km | 9.6 mi | 0 |
| May 18, 2005 | EF1 | 26 km | 0.2 mi | 0 |
| Jun 27, 2001 | EF1 | 99 km | 2.3 mi | 0 |
| May 31, 1997 | EF1 | 98 km | 0.5 mi | 0 |
| Dec 22, 1971 | EF1 | 77 km | 0.5 mi | 0 |
| Oct 26, 1971 | EF1 | 11 km | 3.0 mi | 0 |
| Sep 28, 1962 | EF1 | 66 km | 0.1 mi | 0 |
| Jun 16, 2006 | EF0 | 28 km | 0.5 mi | 0 |
| Jun 5, 2004 | EF0 | 28 km | 0.1 mi | 0 |
| Jun 11, 2001 | EF0 | 65 km | — | 0 |
| Aug 24, 1997 | EF0 | 17 km | 0.5 mi | 0 |
| Jun 23, 1996 | EF0 | 93 km | 0.4 mi | 0 |
| Apr 9, 1991 | EF0 | 70 km | 0.8 mi | 0 |
| Aug 18, 1964 | EF0 | 62 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 | 92 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 113 km |
| 1949 | PUGET SOUND, WA | Meteorological | 2.4 m | — | 94 km |
| 1949 | PUGET SOUND, WA | Eruption + Earthquake | — | 8 | 110 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 28 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
3 volcanoes within 200 km. Closest: Glacier Peak (65 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 65 km |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 81 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 135 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: WOLVERINE (66,329 acres, 2015).
| Year | Name | Acres Burned | Distance |
| 2015 | WOLVERINE | 66,329 | 99 km |
| 2022 | BOLT CREEK | 15,211 | 53 km |
| 2014 | CHIWAUKUM COMPLEX | 14,511 | 97 km |
| 2006 | TINPAN | 9,044 | 96 km |
| 2023 | AIRPLANE LAKE | 7,576 | 70 km |
| 2023 | SOURDOUGH | 7,517 | 98 km |
| 2015 | GOODELL | 6,624 | 89 km |
| 2022 | MINNOW RIDGE | 5,458 | 97 km |
| 2017 | JACK CREEK | 5,184 | 100 km |
| 2022 | SUIATTLE RIVER | 4,400 | 52 km |
| 2016 | BUCK CREEK | 4,199 | 82 km |
| 2022 | IRVING PEAK | 3,983 | 74 km |
| 1994 | ROUND MTN | 3,403 | 96 km |
| 2003 | MINERAL PARK | 3,010 | 78 km |
| 2022 | MCALLISTER CREEK | 2,581 | 92 km |
| 2003 | MAPLE | 2,420 | 84 km |
| 2022 | BOULDER LAKE | 2,347 | 55 km |
| 2020 | DOWNEY CREEK | 2,324 | 63 km |
| 2022 | LOCH KATRINE | 2,163 | 53 km |
| 2020 | CHIKAMIN | 1,948 | 96 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 35°F (2°C) | 8.9 in | Coldest |
| February | 40°F (4°C) | 6.6 in | |
| March | 42°F (6°C) | 6.7 in | |
| April | 47°F (8°C) | 5.2 in | |
| May | 52°F (11°C) | 4.0 in | |
| June | 57°F (14°C) | 3.1 in | |
| July | 66°F (19°C) | 1.9 in | Warmest, Driest |
| August | 62°F (17°C) | 2.1 in | |
| September | 57°F (14°C) | 3.6 in | |
| October | 49°F (10°C) | 5.8 in | |
| November | 42°F (5°C) | 9.6 in | Wettest |
| December | 37°F (3°C) | 9.4 in |
Lake Bosworth has a seasonal temperature swing of 30°F / from 35°F in January to 66°F in July. Total annual precipitation is 66.8 inches, with November being the wettest month (9.6") and July the driest (1.9").