Photo: Kingofthedead · Public domainBethany’s winters are milder and less snowy than most of the U.S.
A typical July afternoon reaches 81°, a January night drops to 35°, and about 4 inches of snow falls in a normal winter.
A year in Bethany at a glance
Each month’s typical high and low, and what it brings.
What stands out about Bethany’s climate
Compared with towns across the U.S., with Bethany’s place in Oregon beside it.
What a year in Bethany feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 280 frost-free days a year
In half of years the last 32° night comes by February 25 and the first by December 1. Day counts come from NOAA’s station at Nature Park-beaverton, OR, 4 miles from the town’s center, at about the same height; frost dates and degree days from Portland Kgw-tv, OR, 8 miles away.
The 2023 USDA map puts Bethany’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 19°. 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 4 inches of snow a winter
Snow, measured at Portland Kgw-tv, OR, is heaviest from January through February, about 1 inches a month. Precipitation (rain plus melted snow) adds up to 39 inches a year; December is the wettest month and July the driest. Rain or snow falls on about 155 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Bethany
90% 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 Portland Kgw-tv, OR.
Living with Bethany’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
280 frost-free days in zone 8b. The last frost comes by Feb 25 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Dec 1.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 7.2 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Bethany from natural hazards, earthquakes are the largest share (43%); heat waves, cold waves, winter storms and ice storms together are 13%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Bethany and its neighbors
Every town next door is within a degree of Bethany in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Bethany’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 |
|---|---|---|---|---|
| Bethany, OR | 35° | 81° | 39" | 3.6" |
| Scotts Valley, CA | 39° | 79° | 37" | 0.0" |
| Kirkland, WA | 36° | 76° | 37" | 3.8" |
| Brigantine, NJ | 28° | 83° | 45" | 10" |
| Swannanoa, NC | 27° | 83° | 48" | 2.1" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Bethany averaged 1.2° warmer than the 1900s. The biggest change is in January (+2.9°).
A smaller shift than in 60% 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 Bethany compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Bethany’s place among Oregon’s.
Bethany weather by month
Highs, lows and precipitation from NOAA’s grid at Bethany’s center; snow, wet days and snow on the ground from Portland Kgw-tv, OR. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 47° | 35° | 5.7" | 1.3" | 20 | 1 | 34° – 46° |
| February | 51° | 35° | 4.2" | 1.4" | 16 | 1 | 37° – 48° |
| March | 56° | 38° | 4.1" | 0.0" | 18 | 0 | 44° – 52° |
| April | 61° | 41° | 2.9" | 0.0" | 17 | 0 | 47° – 56° |
| May | 68° | 46° | 2.2" | 0.0" | 12 | 0 | 52° – 61° |
| June | 73° | 51° | 1.4" | 0.0" | 9 | 0 | 58° – 68° |
| July | 81° | 55° | 0.4" | 0.0" | 3 | 0 | 62° – 72° |
| August | 82° | 55° | 0.5" | 0.0" | 3 | 0 | 65° – 71° |
| September | 76° | 51° | 1.4" | 0.0" | 7 | 0 | 60° – 66° |
| October | 63° | 44° | 3.3" | 0.0" | 13 | 0 | 49° – 58° |
| November | 52° | 39° | 5.8" | 0.0" | 19 | 0 | 40° – 51° |
| December | 46° | 35° | 6.8" | 0.9" | 20 | 0 | 36° – 43° |
| Year | 63° | 44° | 38.7" | 3.6" | 155 | 2 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 34° to 46°. September is the most reliable, staying within 6°.
Where Bethany’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 Bethany’s center.
- Snow: Portland Kgw-tv, OR.
- Frost dates, heating and cooling: Portland Kgw-tv, OR, 8 miles away.
- Freezing nights, 90° and 100° days: Nature Park-beaverton, OR, 4 miles from the town’s center, at about the same height; 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 Bethany’s climate
What is the weather like in Bethany?
A typical July afternoon reaches 81°, a January night drops to 35°, and about 4 inches of snow falls in a normal winter. Milder January nights than 81% of U.S. towns; cooler July afternoons than 87% of U.S. towns.
How cold does it get in Bethany in winter?
December nights average 35°. About 10 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 36°.
How much snow does Bethany get?
About 3.6 inches in a normal winter at Portland Kgw-tv, OR, heaviest from January through February, about 1 inches a month, with snow on the ground about 2 days a year.
How hot does it get in Bethany?
July, with a typical high of 81° and a low of 55°. About 16 days a year reach 90° and 1 reach 100° (Portland Kgw-tv, OR).
When is the first and last frost in Bethany?
In half of years the last spring frost (32°) comes by February 25 and the first fall frost by December 1, about 280 frost-free days, at Portland Kgw-tv, OR.
What growing zone is Bethany in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 19°.
What is the best time of year to visit Bethany?
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 Bethany getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 60% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Bethany.
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.