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Weather & Climate in Jamestown, WA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Jamestown experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 39°F in January while summers reach 61°F in July. The area gets 274 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 16.9 inches (drier than the 38-inch national average). The area receives 1.4 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 26 feet.
Temperature
39°F Jan (4°C)
61°F Jul (16°C)
| Annual Average | 48.9°F |
| 9% below US avg | |
| January Average | 39°F (4°C) |
| July Average | 61°F (16°C) |
| Sunny Days | 274 days/yr |
Geography
| Elevation | 26 ft (8 m) |
| Area | 0.2 sq mi (0.6 km²) |
| Population Density | 705/sq mi |
| Coordinates | 48.1228°N, 123.0910°W |
| Timezone | America/Los_Angeles |
| County | San Juan County County |
| Nearest Airport | Jefferson County International (TWD) 14 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 35.4 / 100 |
| Social Vulnerability | 61.0 / 100 |
| Community Resilience | 95.8 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | Relatively Low |
| Tsunami | Very Low |
| Volcano | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
669 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 | 112 km | 52 km |
| Jul 3, 1999 | 8 km N of Satsop, Washington | M5.8 | 120 km | 40 km |
| May 3, 1996 | 8 km NNE of Lake Marcel-Stillwater, Washington | M5.4 | 99 km | 4 km |
| Jan 29, 1995 | 3 km WSW of Des Moines, Washington | M5.0 | 98 km | 15 km |
| Jun 10, 2001 | 18 km N of Satsop, Washington | M5.0 | 111 km | 40 km |
| Apr 14, 1990 | 4 km ENE of Deming, Washington | M5.0 | 106 km | 12 km |
| Jun 23, 1997 | 2 km NE of Enetai, Washington | M4.9 | 70 km | 13 km |
| Apr 25, 2003 | 26 km W of Brinnon, Washington | M4.8 | 52 km | 51 km |
| Jan 30, 2009 | 6 km ESE of Lofall, Washington | M4.7 | 53 km | 62 km |
| Jul 12, 2019 | 2 km S of Roosevelt, Washington | M4.6 | 85 km | 29 km |
| Mar 3, 2025 | 2025 Orcas Island, Washington | M4.5 | 58 km | 16 km |
| Jun 24, 1997 | 19 km SSW of Gibsons, Canada | M4.4 | 130 km | 3 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 103 km | 0 km |
| Jul 22, 2001 | 4 km WSW of DuPont, Washington | M4.3 | 119 km | 52 km |
| Jun 18, 1994 | 11 km SE of Skykomish, Washington | M4.3 | 147 km | -1 km |
| Sep 21, 2002 | 9 km SW of Friday Harbor, Washington | M4.1 | 40 km | 23 km |
| Feb 23, 2017 | 11 km NE of Hoodsport, Washington | M4.1 | 72 km | 15 km |
| Apr 3, 1990 | 3 km ENE of Deming, Washington | M4.0 | 104 km | 1 km |
| Jun 15, 1994 | 1 km WNW of Hoodsport, Washington | M4.0 | 80 km | 44 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 102 km | 3 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
14 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 injury.
| Date | Rating | Distance | Path | Fatalities |
| Dec 12, 1969 | EF3 | 86 km | 3.8 mi | 0 |
| Dec 18, 2018 | EF2 | 76 km | 1.4 mi | 0 |
| May 13, 1986 | EF2 | 78 km | 0.3 mi | 0 |
| Nov 24, 1970 | EF2 | 66 km | 0.3 mi | 0 |
| Oct 18, 2019 | EF1 | 96 km | 0.7 mi | 0 |
| Jan 18, 2015 | EF1 | 96 km | 4.1 mi | 0 |
| May 18, 2005 | EF1 | 63 km | 0.2 mi | 0 |
| Dec 22, 1971 | EF1 | 99 km | 0.5 mi | 0 |
| Oct 26, 1971 | EF1 | 89 km | 3.0 mi | 0 |
| Sep 28, 1962 | EF1 | 91 km | 0.1 mi | 0 |
| Jun 5, 2004 | EF0 | 64 km | 0.1 mi | 0 |
| Jun 11, 2001 | EF0 | 72 km | — | 0 |
| Aug 24, 1997 | EF0 | 77 km | 0.5 mi | 0 |
| Apr 9, 1991 | EF0 | 65 km | 0.8 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 | 105 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 33 km |
| 1949 | PUGET SOUND, WA | Meteorological | 2.4 m | — | 101 km |
| 1949 | PUGET SOUND, WA | Eruption + Earthquake | — | 8 | 112 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 55 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
4 volcanoes within 200 km. Closest: Baker (119 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 119 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 147 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 173 km |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 192 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
7 wildfires (100+ acres) recorded within 100 km. Largest: DELABARRE (4,176 acres, 2023).
| Year | Name | Acres Burned | Distance |
| 2023 | DELABARRE | 4,176 | 47 km |
| 2018 | MAPLE | 3,547 | 61 km |
| 2015 | PARADISE | 2,818 | 70 km |
| 2016 | HAYES TWO | 2,679 | 42 km |
| 2011 | BIG HUMP | 1,400 | 48 km |
| 1985 | BEAVER | 1,107 | 68 km |
| 2006 | BEAR GULCH II | 1,037 | 71 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 5.2 in | |
| February | 41°F (5°C) | 3.9 in | |
| March | 43°F (6°C) | 3.5 in | |
| April | 47°F (8°C) | 2.3 in | |
| May | 52°F (11°C) | 1.9 in | |
| June | 56°F (14°C) | 1.5 in | |
| July | 61°F (16°C) | 0.9 in | Driest |
| August | 61°F (16°C) | 1.1 in | Warmest |
| September | 57°F (14°C) | 1.4 in | |
| October | 50°F (10°C) | 3.0 in | |
| November | 43°F (6°C) | 5.6 in | |
| December | 39°F (4°C) | 5.9 in | Coldest, Wettest |
Jamestown has a seasonal temperature swing of 23°F / from 39°F in December to 61°F in August. Total annual precipitation is 36.3 inches, with December being the wettest month (5.9") and July the driest (0.9").