All Countries
Weather & Climate in Jefferson, OR
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Jefferson experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 41°F in January while summers reach 68°F in July. The area gets 251 sunny days per year, above the national average. Annual precipitation totals 43.0 inches. The area receives 2.9 inches of snow annually. Air quality is rated Good with a median AQI of 26 / among the cleanest air in the country. 79% of days have good air quality. The city sits at an elevation of 237 feet.
Temperature
41°F Jan (5°C)
68°F Jul (20°C)
| Annual Average | 52.9°F |
| 2% below US avg | |
| January Average | 41°F (5°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 251 days/yr |
Geography
| Elevation | 237 ft (72 m) |
| Area | 0.8 sq mi (2.0 km²) |
| Population Density | 3,856/sq mi |
| Coordinates | 44.7166°N, 123.0060°W |
| Timezone | America/Los_Angeles |
| County | Polk County County |
| Nearest Airport | Mahlon Sweet Field (EUG) 42 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 26.0 |
| Rating | Good |
| Good Days % | 79.0% |
| Unhealthy Days | 1 |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 72.8 / 100 |
| Social Vulnerability | 18.2 / 100 |
| Community Resilience | 64.5 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
178 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 | 47 km | 20 km |
| Jul 12, 2004 | 30 km W of Yachats, Oregon | M4.9 | 125 km | 29 km |
| Aug 19, 2004 | 19 km W of Newport, Oregon | M4.7 | 103 km | 27 km |
| Jun 29, 2002 | 6 km ENE of Government Camp, Oregon | M4.5 | 124 km | 5 km |
| Jul 4, 2015 | 16 km ENE of Springfield, Oregon | M4.1 | 71 km | 8 km |
| Jun 6, 2021 | 6 km NE of Government Camp, Oregon | M3.9 | 124 km | 4 km |
| Apr 24, 2003 | 3 km NW of North Portland, Oregon | M3.9 | 104 km | 17 km |
| Apr 15, 2017 | 43 km WNW of Yachats, Oregon | M3.9 | 132 km | 38 km |
| Feb 8, 1995 | 9 km ESE of Hubbard, Oregon | M3.8 | 53 km | 24 km |
| Jun 29, 2002 | 7 km NE of Government Camp, Oregon | M3.8 | 125 km | 5 km |
| Aug 3, 2006 | 2 km WNW of Cherry Grove, Washington | M3.8 | 125 km | 14 km |
| Jun 8, 1993 | 5 km ESE of Scotts Mills, Oregon | M3.7 | 48 km | 19 km |
| Mar 20, 2012 | 29 km WNW of Yachats, Oregon | M3.7 | 121 km | 33 km |
| Jan 31, 2013 | 3 km ENE of Amboy, Washington | M3.7 | 142 km | 6 km |
| Jul 3, 1992 | 57 km W of Waldport, Oregon | M3.6 | 142 km | 21 km |
| Feb 24, 1999 | 8 km WSW of Molalla, Oregon | M3.6 | 52 km | 34 km |
| May 19, 2019 | 3 km ESE of Rose Lodge, Oregon | M3.6 | 73 km | 44 km |
| Sep 8, 2012 | 8 km N of Scotts Mills, Oregon | M3.5 | 51 km | 24 km |
| Aug 2, 1996 | 4 km S of Scotts Mills, Oregon | M3.5 | 41 km | 29 km |
| Jul 22, 1991 | 8 km N of Bethany, Oregon | M3.5 | 103 km | 19 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
50 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 3 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Dec 14, 2010 | EF2 | 17 km | 5.0 mi | 0 |
| Dec 8, 1993 | EF2 | 63 km | 6.0 mi | 0 |
| Sep 1, 2017 | EF1 | 28 km | 0.7 mi | 0 |
| Jun 13, 2013 | EF1 | 58 km | 0.3 mi | 0 |
| Jun 21, 2003 | EF1 | 20 km | 0.3 mi | 0 |
| Oct 9, 2000 | EF1 | 57 km | 0.1 mi | 0 |
| Oct 9, 2000 | EF1 | 75 km | 0.1 mi | 0 |
| Nov 12, 1991 | EF1 | 76 km | 0.2 mi | 0 |
| Nov 24, 1989 | EF1 | 80 km | 0.3 mi | 0 |
| Mar 8, 1960 | EF1 | 12 km | 1.0 mi | 0 |
| Apr 12, 1957 | EF1 | 94 km | 2.5 mi | 0 |
| Dec 6, 1951 | EF1 | 62 km | 0.3 mi | 0 |
| Oct 31, 2024 | EF0 | 83 km | 0.2 mi | 0 |
| Jun 18, 2023 | EF0 | 47 km | 0.3 mi | 0 |
| Oct 24, 2022 | EF0 | 50 km | 0.0 mi | 0 |
| Oct 22, 2022 | EF0 | 100 km | 0.9 mi | 0 |
| Jun 13, 2020 | EF0 | 88 km | 2.0 mi | 0 |
| Sep 8, 2019 | EF0 | 100 km | 0.1 mi | 0 |
| Jul 1, 2019 | EF0 | 98 km | 1.6 mi | 0 |
| Oct 29, 2018 | EF0 | 94 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Nearby Volcanoes
12 volcanoes within 200 km. Closest: Sand Mountain Field (93 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Sand Mountain Field | Pyroclastic cone(s) | 1,664 m (5,459 ft) | -950 | 93 km |
| Jefferson | Stratovolcano | 3,199 m (10,495 ft) | 950 | 95 km |
| Belknap | Shield(s) | 2,095 m (6,873 ft) | 480 | 104 km |
| Three Sisters | Complex | 3,159 m (10,364 ft) | 440 | 118 km |
| Hood | Stratovolcano | 3,426 m (11,240 ft) | 1866 | 126 km |
| Bachelor | Stratovolcano | 2,763 m (9,065 ft) | -5800 | 133 km |
| West Crater | Volcanic field | 1,329 m (4,360 ft) | -5750 | 148 km |
| Davis Lake | Volcanic field | 2,163 m (7,096 ft) | -2790 | 159 km |
| Indian Heaven | Shield(s) | 1,806 m (5,925 ft) | -6250 | 164 km |
| St. Helens | Stratovolcano | 2,549 m (8,363 ft) | 2008 | 177 km |
| Cinnamon Butte | Pyroclastic cone(s) | 1,956 m (6,417 ft) | Unknown | 179 km |
| Newberry | Shield | 2,434 m (7,986 ft) | 690 | 180 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: LIONSHEAD (197,732 acres, 2020).
| Year | Name | Acres Burned | Distance |
| 2020 | LIONSHEAD | 197,732 | 92 km |
| 2020 | BEACHIE CREEK | 194,619 | 52 km |
| 2020 | HOLIDAY FARM | 174,390 | 74 km |
| 2020 | RIVERSIDE | 138,190 | 77 km |
| 2023 | BEDROCK | 31,692 | 90 km |
| 2021 | GALES | 31,655 | 96 km |
| 2021 | BULL COMPLEX | 26,233 | 78 km |
| 2023 | LOOKOUT | 25,103 | 88 km |
| 2017 | WHITEWATER | 11,758 | 89 km |
| 2018 | TERWILLIGER | 11,400 | 97 km |
| 2017 | JONES | 10,260 | 88 km |
| 2011 | SHADOW LAKE | 6,866 | 99 km |
| 2014 | 36 PIT | 5,838 | 83 km |
| 2006 | CASCADE CREST COMPLEX (PUZZLE) | 5,400 | 94 km |
| 1987 | ROCKHOUSE | 5,011 | 44 km |
| 2003 | CLARK | 4,905 | 88 km |
| 2017 | AVENUE | 4,323 | 97 km |
| 2010 | SCOTT MOUNTAIN | 3,361 | 100 km |
| 2011 | MOTHER LODE | 2,881 | 74 km |
| 2001 | DARK LAKE | 2,724 | 99 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 6.7 in | |
| February | 43°F (6°C) | 5.4 in | |
| March | 47°F (8°C) | 4.7 in | |
| April | 50°F (10°C) | 2.8 in | |
| May | 56°F (13°C) | 2.2 in | |
| June | 61°F (16°C) | 1.5 in | |
| July | 68°F (20°C) | 0.6 in | Warmest, Driest |
| August | 66°F (19°C) | 0.8 in | |
| September | 62°F (17°C) | 1.5 in | |
| October | 54°F (12°C) | 3.2 in | |
| November | 45°F (7°C) | 6.9 in | |
| December | 40°F (5°C) | 7.5 in | Coldest, Wettest |
Jefferson has a seasonal temperature swing of 27°F / from 40°F in December to 68°F in July. Total annual precipitation is 43.7 inches, with December being the wettest month (7.5") and July the driest (0.6").