Jacob Conser House · Photo: Ian Poellet · CC BY-SA 3.0Midwinter lows in Jefferson stay above those of 81% of U.S. towns
The warmest part of a July day comes in at 82° on average. Only 48° separates winter nights from summer afternoons. By July afternoons alone, it runs cooler than 78% of U.S. towns. Garden chairs stay out from May to October, the months with highs of 64–83°.
A year in Jefferson at a glance
Each month’s typical high and low, and what it brings.
What stands out about Jefferson’s climate
Compared with towns across the U.S., with Jefferson’s place in Oregon beside it.
What a year in Jefferson feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 222 frost-free days a year
In half of years the last 32° night comes by March 29 and the first by November 6. Frost and day counts come from NOAA’s station at Stayton, OR, 11 miles from the town’s center, 180 ft higher.
The 2023 USDA map puts Jefferson’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 18°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 3 inches of snow a winter
Snow, measured at Corvallis State Univ, OR, falls mostly in February. Precipitation (rain plus melted snow) adds up to 43 inches a year; December is the wettest month and July the driest. Rain or snow falls on about 168 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Jefferson
95% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Stayton, OR.
Living with Jefferson’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
222 frost-free days in zone 8b. The last frost comes by Mar 29 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 6.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Jefferson from natural hazards, earthquakes are the largest share (79%); heat waves, cold waves, winter storms and ice storms together are 3%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Jefferson and similar climates
TownRatings has no climate map of the towns around Jefferson yet.
Climates most like Jefferson’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Jefferson, OR | 36° | 82° | 43" | 2.9" |
| Healdsburg, CA | 38° | 85° | 41" | 0.0" |
| Orting, WA | 35° | 78° | 40" | 5.6" |
| Brigantine, NJ | 28° | 83° | 45" | 10" |
| Swannanoa, NC | 27° | 83° | 48" | 2.1" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Jefferson averaged 1.1° warmer than the 1900s. The biggest change is in January (+2.5°).
A smaller shift than in 71% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Jefferson compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Jefferson’s place among Oregon’s.
Jefferson weather by month
Highs, lows and precipitation from NOAA’s grid at Jefferson’s center; snow, wet days and snow on the ground from Corvallis State Univ, OR. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 48° | 36° | 6.4" | 0.5" | 21 | 1 | 36° – 46° |
| February | 51° | 36° | 4.6" | 1.6" | 18 | 1 | 38° – 49° |
| March | 56° | 38° | 4.9" | 0.1" | 20 | 0 | 44° – 51° |
| April | 61° | 41° | 3.4" | 0.0" | 18 | 0 | 47° – 56° |
| May | 68° | 46° | 2.5" | 0.0" | 13 | 0 | 52° – 61° |
| June | 74° | 50° | 1.5" | 0.0" | 8 | 0 | 57° – 68° |
| July | 82° | 53° | 0.4" | 0.0" | 3 | 0 | 62° – 71° |
| August | 83° | 53° | 0.5" | 0.0" | 3 | 0 | 65° – 71° |
| September | 77° | 49° | 1.6" | 0.0" | 7 | 0 | 60° – 66° |
| October | 64° | 43° | 3.7" | 0.0" | 15 | 0 | 49° – 59° |
| November | 53° | 38° | 6.3" | 0.0" | 21 | 0 | 40° – 51° |
| December | 46° | 35° | 7.3" | 0.7" | 22 | 0 | 35° – 45° |
| Year | 64° | 43° | 43.0" | 2.9" | 168 | 1 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 40° to 51°. September is the most reliable, staying within 6°.
Where Jefferson’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Jefferson’s center.
- Snow: Corvallis State Univ, OR.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Stayton, OR, 11 miles from the town’s center, 180 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Jefferson’s climate
What is the weather like in Jefferson?
A typical July afternoon reaches 82°, a January night drops to 36°, and about 3 inches of snow falls in a normal winter. Milder January nights than 81% of U.S. towns; cooler July afternoons than 78% of U.S. towns.
How cold does it get in Jefferson in winter?
December nights average 35°. About 51 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 35°.
How much snow does Jefferson get?
About 2.9 inches in a normal winter at Corvallis State Univ, OR, most of it in February, with snow on the ground about 1 days a year.
How hot does it get in Jefferson?
July, with a typical high of 82° and a low of 53°. About 12 days a year reach 90° (Stayton, OR).
When is the first and last frost in Jefferson?
In half of years the last spring frost (32°) comes by March 29 and the first fall frost by November 6, about 222 frost-free days, at Stayton, OR.
What growing zone is Jefferson in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 18°.
What is the best time of year to visit Jefferson?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Jefferson getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 71% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Jefferson.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.