Corvallis, Oregon climate: Normal weather by month, frost dates and records
Corvallis's normal year runs from 34°F December nights to 84°F August afternoons, with 43.0 inches of precipitation and 3 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.6°C, December lows of 1°C, August highs of 29°C, 1,093 mm of precipitation a year.
- NOAA stationCorvallis State University
- Station IDUSC00351862
- Location44.63°N 123.19°W
- Elevation225 ft (69 m)
- From the center6 miles
- Population61,993
On October 23, the normal high in Corvallis is 62°F and the normal low 41°F, and the chance of measurable rain or snow is 52%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Corvallis.
- Jan 47° 34°
- Feb 51° 35°
- Mar 56° 37°
- Apr 61° 40°
- May 68° 45°
- Jun 74° 49°
- Jul 83° 52°
- Aug 84° 51°
- Sep 78° 48°
- Oct 65° 42°
- Nov 53° 38°
- Dec 47° 34°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Corvallis each month?
August is the warmest month, with normal highs of 84°F; December the coldest, with normal lows of 34°F. The most precipitation falls in December (7.71 in), the least in July (0.34 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 47°F | 34°F | 40.9°F | 6.46 | 0.5 | 21 | <1 | 12 | 9 h 10 min |
| February | 51°F | 35°F | 43.0°F | 4.80 | 1.6 | 18 | <1 | 11 | 10 h 30 min |
| March | 56°F | 37°F | 46.5°F | 4.95 | 0.1 | 20 | <1 | 7 | 11 h 50 min |
| April | 61°F | 40°F | 50.2°F | 3.29 | 0.0 | 18 | <1 | 3 | 13 h 30 min |
| May | 68°F | 45°F | 56.3°F | 2.31 | 0.0 | 13 | <1 | <1 | 14 h 50 min |
| June | 74°F | 49°F | 61.2°F | 1.34 | 0.0 | 8 | 2 | <1 | 15 h 30 min |
| July | 83°F | 52°F | 67.5°F | 0.34 | 0.0 | 3 | 7 | <1 | 15 h 20 min |
| August | 84°F | 51°F | 67.6°F | 0.39 | 0.0 | 3 | 7 | <1 | 14 h 10 min |
| September | 78°F | 48°F | 62.9°F | 1.49 | 0.0 | 7 | 3 | <1 | 12 h 40 min |
| October | 65°F | 42°F | 53.5°F | 3.50 | 0.0 | 15 | <1 | 2 | 11 h |
| November | 53°F | 38°F | 45.4°F | 6.46 | 0.0 | 21 | <1 | 7 | 9 h 40 min |
| December | 47°F | 34°F | 40.3°F | 7.71 | 0.7 | 22 | <1 | 13 | 8 h 50 min |
| Year (annual) | 64°F | 42°F | 52.9°F | 43.04 | 2.9 | 168 | 18 | 54 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 9°C | 1°C | 4.9°C | 164 mm | 1 cm |
| February | 11°C | 2°C | 6.1°C | 122 mm | 4 cm |
| March | 13°C | 3°C | 8.1°C | 126 mm | 0 cm |
| April | 16°C | 4°C | 10.1°C | 84 mm | 0 cm |
| May | 20°C | 7°C | 13.5°C | 59 mm | 0 cm |
| June | 23°C | 9°C | 16.2°C | 34 mm | 0 cm |
| July | 28°C | 11°C | 19.7°C | 9 mm | 0 cm |
| August | 29°C | 11°C | 19.8°C | 10 mm | 0 cm |
| September | 25°C | 9°C | 17.2°C | 38 mm | 0 cm |
| October | 18°C | 6°C | 11.9°C | 89 mm | 0 cm |
| November | 12°C | 3°C | 7.4°C | 164 mm | 0 cm |
| December | 8°C | 1°C | 4.6°C | 196 mm | 2 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00351862; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Corvallis?
Normal highs sit between 65°F and 85°F in May, June, July, August, September and October. Of those, July has the fewest days with rain (3).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00351862.
When is the last frost in Corvallis?
In Corvallis, the last spring frost (32°F) comes after April 17 in half of years and after May 8 in one year in ten; the first autumn frost comes before October 28 in half of years and before October 5 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 171 year in 10 after May 8; 9 in 10 after March 22
- First autumn frost, half of years before
- October 281 year in 10 before October 5; 9 in 10 before November 19
NOAA puts the median frost-free season at 194 days, and the season without a hard freeze (28°F) at 259 days.
A hard freeze (28°F) comes after March 1 in half of springs and before November 17 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Corvallis in zone 8b across its 2 ZIP code areas (8b in 97330, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Corvallis's NOAA station is in zone 8b: the coldest night of a typical year reaches 18°F (29 complete years).
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00351862; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Corvallis ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Corvallis's 2 ZIP code areas are all in zone 8b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Corvallis?
In a normal year in Corvallis, 18 days a year reach 90°F (1 of them 100°F or more), 54 nights fall to 32°F or colder and 168 days bring measurable precipitation.
- Days at 90°F or more
- 18a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 54a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 168a normal year
- Days with 1 inch of snow or more
- 1a normal year
The highest temperature in this station's record (since 1893) is 110°F, on June 29, 2021; the lowest is −8°F, on December 25, 1924.
The wettest calendar year on that record is 1996, with 73.21 in; the snowiest season is 1968–69, with 27.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00351862; records: ACIS (NOAA Regional Climate Centers), station USC00351862. Records use complete months only; a month missing more than three days is left out.
How sunny is Corvallis?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Corvallis, 3.9 kWh per square metre a day. July is the sunniest month (87%) and December the cloudiest (54%). Among the 459 U.S. places of 50,000 or more, that ranks tied 352nd (with 32 others) in sunshine.
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 57% | 1.3 |
| February | 61% | 2.2 |
| March | 61% | 3.2 |
| April | 66% | 4.5 |
| May | 71% | 5.7 |
| June | 74% | 6.3 |
| July | 87% | 7.1 |
| August | 86% | 6.1 |
| September | 81% | 4.5 |
| October | 70% | 2.8 |
| November | 59% | 1.5 |
| December | 54% | 1.1 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Corvallis need?
A normal year in Corvallis brings 4,670 heating degree days, 13% fewer than the median U.S. place (5,373), and 291 cooling degree days, 68% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,278 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 749 | 0 |
| February | 615 | 0 |
| March | 572 | 0 |
| April | 444 | 0 |
| May | 276 | 6 |
| June | 142 | 28 |
| July | 30 | 107 |
| August | 28 | 107 |
| September | 104 | 41 |
| October | 358 | 1 |
| November | 588 | 0 |
| December | 766 | 0 |
| Year (annual) | 4,670 | 291 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00351862. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Corvallis been warmer than normal lately?
2024 averaged 53.8°F, 0.9°F above the 1991-2020 normal of 52.9°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 53.9°F | +1.0°F | 42.72 | 9.8 |
| 2022 | 52.8°F | −0.1°F | 39.70 | 0.0 |
| 2023 | 53.5°F | +0.6°F | 35.93 | 1.8 |
| 2024 | 53.8°F | +0.9°F | 48.16 | 2.7 |
Over 108 complete years from 1891 to 2024, the station's annual mean temperature rose at a fitted 1.5°F per century (+0.09°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00351862; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Corvallis's climate compare?
Corvallis is warmer than 65 of the other 104 places with their own NOAA record in Oregon, and wetter than 58. Across the 7,247 U.S. stations with normals, its annual mean of 52.9°F is warmer than 53%.
In the Köppen classification computed from these normals, Corvallis is Csb: temperate, dry-summer, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Corvallis share this climate record?
7 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Albany, ORalso near: Lebanon (12 mi, 54.9°F a year); Stayton (18 mi, 52.8°F a year)57,156 people · 5 mi E
- Philomath, OR5,795 people · 11 mi SW
- Millersburg, OR3,541 people · 7 mi NE
- Tangent, OR1,253 people · 7 mi SE
- Adair Village, OR1,028 people · 3 mi NW
- Peoria, OR173 people · 13 mi S
- Blodgett, OR0 people · 16 mi W
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Corvallis's other NOAA stations record?
2 more NOAA stations keep 1991-2020 normals in or near Corvallis. This page uses Corvallis State University; the others differ by site and elevation:
| Station | From the center | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Corvallis (10 mi SSW) USW00004236 | 11 mi S | 312 ft | 52.2°F | 34°F | 82°F | 41.5 | – | April 11 |
| Corvallis Water Bureau USC00351877 | 10 mi SW | 592 ft | 49.8°F | 28°F | 82°F | 68.8 | 5 | May 15 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Corvallis's climate
What is the coldest month in Corvallis?
December, with a normal high of 47°F and a normal low of 34°F. The warmest is August (84°F by day, 51°F at night).
Does it snow in Corvallis?
Yes: 3 inches in a normal year, falling on 2 days with 0.1 inch or more, the most in February (1.6 inches).
What is the rainiest month in Corvallis?
December, with 7.71 in of precipitation in a normal year; the driest is July with 0.34 in.
What plant hardiness zone is Corvallis in?
The USDA's 2023 map puts Corvallis in zone 8b across its 2 ZIP code areas (8b in 97330, the largest). By the same method at Corvallis's NOAA station, the coldest night of a typical year reaches 18°F (29 years, 1991-2020): zone 8b.
How late can frost come in Corvallis?
In half of years the last 32°F night comes after April 17; in one year in ten it comes after May 8. Waiting until May 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Lebanon, OR16 miles from this station, 54.9°F a year
- Falls City, OR19 miles from this station, 50.9°F a year
- Salem, OR21 miles from this station, 54.1°F a year
- Stayton, OR21 miles from this station, 52.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made