Photo: Stevedrone91 · CC BY-SA 4.0Oregon’s winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 84°, a January night drops to 13°, and about 32 inches of snow falls in a normal winter.
A year in Oregon at a glance
Each month’s typical high and low, and what it brings.
What stands out about Oregon’s climate
Compared with towns across the U.S., with Oregon’s place in Illinois beside it.
What a year in Oregon feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 161 frost-free days a year
In half of years the last 32° night comes by April 29 and the first by October 7. Frost and day counts come from NOAA’s station at Polo 5nw, IL, 14 miles from the town’s center, 150 ft higher.
The 2023 USDA map puts Oregon’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −15°. 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 32 inches of snow a winter
Snow, measured at Oregon, IL, falls mostly in January. Precipitation (rain plus melted snow) adds up to 39 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 88 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Oregon
89% 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 Polo 5nw, IL.
Living with Oregon’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
161 frost-free days in zone 5b. The last frost comes by Apr 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 Oct 7.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 0.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Oregon from natural hazards, river flooding is the largest share (61%); heat waves, cold waves, winter storms and ice storms together are 16%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Oregon and similar climates
TownRatings has no climate map of the towns around Oregon yet.
Climates most like Oregon’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 |
|---|---|---|---|---|
| Oregon, IL | 13° | 84° | 39" | 32" |
| Grinnell, IA | 12° | 84° | 38" | 31" |
| Garrett, IN | 17° | 83° | 38" | 30" |
| Sayre, PA | 17° | 84° | 37" | 35" |
| Ghent, NY | 16° | 84° | 42" | 31" |
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 Oregon averaged 1.2° warmer than the 1900s. The biggest change is in December (+2.6°).
A smaller shift than in 61% 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 Oregon compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Oregon’s place among Illinois’.
Oregon weather by month
Highs, lows and precipitation from NOAA’s grid at Oregon’s center; snow, wet days and snow on the ground from Oregon, IL. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 29° | 13° | 1.7" | 13.6" | 7 | 12° – 34° |
| February | 34° | 17° | 1.7" | 6.7" | 6 | 12° – 37° |
| March | 47° | 28° | 2.4" | 3.0" | 7 | 29° – 52° |
| April | 60° | 37° | 3.8" | 0.8" | 8 | 40° – 55° |
| May | 72° | 49° | 4.6" | 0.0" | 10 | 54° – 67° |
| June | 81° | 59° | 5.1" | 0.0" | 9 | 66° – 74° |
| July | 84° | 62° | 4.1" | 0.0" | 7 | 67° – 79° |
| August | 82° | 60° | 4.0" | 0.0" | 7 | 65° – 77° |
| September | 76° | 52° | 3.6" | 0.0" | 7 | 58° – 69° |
| October | 63° | 41° | 3.0" | 0.0" | 7 | 47° – 58° |
| November | 47° | 30° | 2.5" | 1.5" | 6 | 30° – 48° |
| December | 35° | 19° | 2.0" | 6.7" | 7 | 13° – 38° |
| Year | 59° | 39° | 38.5" | 32.3" | 88 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 13° to 38°. June is the most reliable, staying within 8°.
Where Oregon’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 Oregon’s center.
- Snow: Oregon, IL (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Polo 5nw, IL, 14 miles from the town’s center, 150 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 Oregon’s climate
What is the weather like in Oregon?
A typical July afternoon reaches 84°, a January night drops to 13°, and about 32 inches of snow falls in a normal winter. Colder January nights than 89% of U.S. towns; cooler July afternoons than 63% of U.S. towns.
How cold does it get in Oregon in winter?
January nights average 13°. About 138 nights a year reach 32° or below and 13 reach 0° or below. In the coldest January of the last 30 years the month averaged 12°.
How much snow does Oregon get?
About 32 inches in a normal winter at Oregon, IL, most of it in January.
How hot does it get in Oregon?
July, with a typical high of 84° and a low of 62°. About 17 days a year reach 90° (Polo 5nw, IL).
When is the first and last frost in Oregon?
In half of years the last spring frost (32°) comes by April 29 and the first fall frost by October 7, about 161 frost-free days, at Polo 5nw, IL.
What growing zone is Oregon in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −15°.
What is the best time of year to visit Oregon?
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 Oregon getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 61% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Oregon.
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.