Cottage Grove, Oregon climate: Normal weather by month, frost dates and records
Cottage Grove's normal year runs from 33°F December nights to 82°F July afternoons, with 46.5 inches of precipitation and 3 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.3°C, December lows of 1°C, July highs of 28°C, 1,180 mm of precipitation a year.
- NOAA stationCottage Grove (2 mi E)
- Station IDUSC00351897
- Location43.79°N 123.03°W
- Elevation595 ft (181 m)
- Population10,690
On October 23, the normal high in Cottage Grove is 61°F and the normal low 40°F, and the chance of measurable rain or snow is 56%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Cottage Grove.
- Jan 48° 33°
- Feb 52° 34°
- Mar 56° 35°
- Apr 61° 38°
- May 68° 44°
- Jun 73° 48°
- Jul 82° 51°
- Aug 83° 50°
- Sep 77° 46°
- Oct 64° 41°
- Nov 53° 37°
- Dec 47° 33°
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 Cottage Grove each month?
July is the warmest month, with normal highs of 82°F; December the coldest, with normal lows of 33°F. The most precipitation falls in December (7.57 in), the least in July (0.40 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 48°F | 33°F | 40.7°F | 6.57 | 0.9 | 21 | <1 | 12 | 9 h 20 min |
| February | 52°F | 34°F | 42.7°F | 4.86 | 1.1 | 18 | <1 | 11 | 10 h 30 min |
| March | 56°F | 35°F | 45.8°F | 5.24 | 0.3 | 20 | <1 | 9 | 11 h 50 min |
| April | 61°F | 38°F | 49.7°F | 4.46 | 0.0 | 18 | <1 | 3 | 13 h 20 min |
| May | 68°F | 44°F | 55.6°F | 3.11 | 0.0 | 13 | <1 | <1 | 14 h 40 min |
| June | 73°F | 48°F | 60.5°F | 1.67 | 0.0 | 9 | 2 | <1 | 15 h 30 min |
| July | 82°F | 51°F | 66.6°F | 0.40 | 0.0 | 3 | 6 | <1 | 15 h 10 min |
| August | 83°F | 50°F | 66.5°F | 0.53 | 0.0 | 3 | 6 | <1 | 14 h |
| September | 77°F | 46°F | 61.3°F | 1.54 | 0.0 | 6 | 2 | <1 | 12 h 30 min |
| October | 64°F | 41°F | 52.6°F | 3.75 | 0.0 | 16 | <1 | 2 | 11 h 10 min |
| November | 53°F | 37°F | 45.0°F | 6.77 | 0.0 | 21 | <1 | 7 | 9 h 40 min |
| December | 47°F | 33°F | 40.0°F | 7.57 | 0.4 | 22 | <1 | 13 | 9 h |
| Year (annual) | 64°F | 41°F | 52.3°F | 46.47 | 2.7 | 170 | 16 | 59 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 9°C | 1°C | 4.8°C | 167 mm | 2 cm |
| February | 11°C | 1°C | 5.9°C | 123 mm | 3 cm |
| March | 13°C | 2°C | 7.7°C | 133 mm | 1 cm |
| April | 16°C | 3°C | 9.8°C | 113 mm | 0 cm |
| May | 20°C | 6°C | 13.1°C | 79 mm | 0 cm |
| June | 23°C | 9°C | 15.8°C | 42 mm | 0 cm |
| July | 28°C | 11°C | 19.2°C | 10 mm | 0 cm |
| August | 28°C | 10°C | 19.2°C | 13 mm | 0 cm |
| September | 25°C | 8°C | 16.3°C | 39 mm | 0 cm |
| October | 18°C | 5°C | 11.4°C | 95 mm | 0 cm |
| November | 12°C | 3°C | 7.2°C | 172 mm | 0 cm |
| December | 8°C | 1°C | 4.4°C | 192 mm | 1 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00351897; 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 Cottage Grove?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. 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 USC00351897.
When is the last frost in Cottage Grove?
In Cottage Grove, the last spring frost (32°F) comes after April 24 in half of years and after May 10 in one year in ten; the first autumn frost comes before October 25 in half of years and before September 30 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 241 year in 10 after May 10; 9 in 10 after March 31
- First autumn frost, half of years before
- October 251 year in 10 before September 30; 9 in 10 before November 16
NOAA puts the median frost-free season at 183 days, and the season without a hard freeze (28°F) at 239 days.
A hard freeze (28°F) comes after March 23 in half of springs and before November 18 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Cottage Grove in zone 8b in ZIP code 97424, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Cottage Grove's NOAA station is in zone 8b: the coldest night of a typical year reaches 18°F (27 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 USC00351897; 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.
How hot and how cold does it get in Cottage Grove?
In a normal year in Cottage Grove, 16 days a year reach 90°F (1 of them 100°F or more), 59 nights fall to 32°F or colder and 170 days bring measurable precipitation.
- Days at 90°F or more
- 16a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 59a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 170a normal year
- Days with 1 inch of snow or more
- 1a normal year
The highest temperature in this station's record (since 1916) is 105°F, on June 28, 2021; the lowest is −4°F, on December 13, 1919.
The wettest calendar year on that record is 1950, with 63.09 in; the snowiest season is 1949–50, with 48.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00351897; records: ACIS (NOAA Regional Climate Centers), station USC00351897. Records use complete months only; a month missing more than three days is left out.
How sunny is Cottage Grove?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Cottage Grove, 4.0 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (55%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 59% | 1.5 |
| February | 62% | 2.3 |
| March | 63% | 3.4 |
| April | 67% | 4.7 |
| May | 72% | 5.9 |
| June | 76% | 6.6 |
| July | 88% | 7.3 |
| August | 88% | 6.3 |
| September | 83% | 4.8 |
| October | 72% | 3.0 |
| November | 60% | 1.6 |
| December | 55% | 1.2 |
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 Cottage Grove need?
A normal year in Cottage Grove brings 4,854 heating degree days, 10% fewer than the median U.S. place (5,373), and 225 cooling degree days, 75% 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 2,107 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 752 | 0 |
| February | 623 | 0 |
| March | 595 | 0 |
| April | 459 | 0 |
| May | 295 | 5 |
| June | 157 | 22 |
| July | 40 | 88 |
| August | 38 | 85 |
| September | 135 | 24 |
| October | 386 | 0 |
| November | 599 | 0 |
| December | 775 | 0 |
| Year (annual) | 4,854 | 225 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00351897. 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 Cottage Grove been warmer than normal lately?
2024 averaged 53.0°F, 0.7°F above the 1991-2020 normal of 52.3°F. 3 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 53.5°F | +1.2°F | 40.20 | 7.2 |
| 2023 | 52.9°F | +0.6°F | 34.99 | 0.5 |
| 2024 | 53.0°F | +0.7°F | 52.57 | 0.0 |
Over 86 complete years from 1918 to 2024, the station's annual mean temperature rose at a fitted 1.7°F per century (+0.10°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00351897; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Cottage Grove's climate compare?
Cottage Grove is warmer than 56 of the other 104 places with their own NOAA record in Oregon, and wetter than 62. Across the 7,247 U.S. stations with normals, its annual mean of 52.3°F is warmer than 51%.
In the Köppen classification computed from these normals, Cottage Grove 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 Cottage Grove share this climate record?
Creswell has no NOAA station with 1991-2020 normals of its 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.
- Creswell, OR5,615 people · 9 mi N
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 Cottage Grove's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Cottage Grove. This page uses Cottage Grove (2 mi E); the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Cottage Grove Dam USC00351902 | 5 mi S | 831 ft | 52.2°F | 34°F | 81°F | 47.6 | – | April 12 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Cottage Grove's climate
What is the coldest month in Cottage Grove?
December, with a normal high of 47°F and a normal low of 33°F. The warmest is July (82°F by day, 51°F at night).
Does it snow in Cottage Grove?
Yes: 3 inches in a normal year, falling on 2 days with 0.1 inch or more, the most in February (1.1 inches).
What is the rainiest month in Cottage Grove?
December, with 7.57 in of precipitation in a normal year; the driest is July with 0.40 in.
What plant hardiness zone is Cottage Grove in?
The USDA's 2023 map puts Cottage Grove in zone 8b in ZIP code 97424, the nearest ZIP area. By the same method at Cottage Grove's NOAA station, the coldest night of a typical year reaches 18°F (27 years, 1991-2020): zone 8b.
How late can frost come in Cottage Grove?
In half of years the last 32°F night comes after April 24; in one year in ten it comes after May 10. Waiting until May 10 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Cottage Grove in OctoberThis month day by day, its records and recent years
- Oregon climateThe statewide normals and every place in the state
- Dorena, OR3 miles from this station, 52.0°F a year
- Lookout Point Dam, OR16 miles from this station, 53.4°F a year
- Drain, OR17 miles from this station, 54.1°F a year
- Fern Ridge-Veneta, OR25 miles from this station, 52.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made