Corvallis, OR climate
Corvallis has mild winters and pleasant summers. A typical July afternoon reaches 83°, a January night drops to 35°, and about 4 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Corvallis feels like
Winter
Spring
Summer
Fall
Corvallis weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 48° | 35° | 6.4" | 0.5" | 17 | 0 | 36° – 45° |
| February | 52° | 36° | 5.0" | 1.9" | 16 | 1 | 38° – 49° |
| March | 57° | 37° | 5.2" | 0.6" | 19 | 0 | 43° – 53° |
| April | 62° | 40° | 3.3" | 0 | 16 | 0 | 47° – 56° |
| May | 69° | 45° | 2.1" | 0 | 11 | 0 | 53° – 61° |
| June | 75° | 49° | 1.1" | 0 | 8 | 0 | 57° – 68° |
| July | 83° | 52° | 0.3" | 0 | 2 | 0 | 63° – 72° |
| August | 84° | 52° | 0.4" | 0 | 3 | 0 | 65° – 72° |
| September | 78° | 49° | 1.3" | 0 | 7 | 0 | 60° – 66° |
| October | 65° | 43° | 3.3" | 0 | 13 | 0 | 50° – 59° |
| November | 53° | 38° | 6.2" | 0.1" | 17 | 0 | 40° – 51° |
| December | 47° | 35° | 7.6" | 0.8" | 19 | 1 | 35° – 45° |
| Year | 64° | 43° | 42.0" | 3.9" | 147 | 3 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Corvallis
Corvallis gets 42 inches of rain and melted snow a year. December is the wettest month and July the driest. Rain or snow falls on about 147 days a year.
About 194 frost-free days a year
In half of years the last 32° night comes by April 17 and the first one by October 28. That leaves about 194 frost-free days for gardens, longer than 68% of U.S. towns.
Heating and cooling a home in Corvallis
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Corvallis, 94% of that work is heating and 6% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Corvallis compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Corvallis averaged 1.1° warmer than the 1900s. The biggest change is in January (+2.5°). The shift is smaller than in 62% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Corvallis’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 38° to 49°. September is the most reliable, staying within 6°.
Common questions about Corvallis’s climate
What is the coldest month in Corvallis?
December, with a typical high of 47° and a low of 35°.
What is the hottest month in Corvallis?
August, with a typical high of 84° and a low of 52°. About 18 days a year reach 90°.
How much snow does Corvallis get?
About 4 inches in a normal winter, most of it in February.
When is the first frost in Corvallis?
In half of years the first 32° night comes by October 28, and the last spring frost by April 17.
What is the rainiest month in Corvallis?
December, with 7.6 inches of rain and melted snow. The year totals 42 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Corvallis itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Corvallis 1.9 Sse, OR (2 mi, snow) and Corvallis State Univ, OR (6 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.