Cottage Grove Dam, OR Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Cottage Grove Dam's primary NOAA station, COTTAGE GROVE DAM.
The climate verdict for Cottage Grove Dam
Water is the standout signal in Cottage Grove Dam, Oregon: 47.6 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 52°F. Its climate comfort score of 68/100 (good) lands mid-pack nationally, exceeding 56% of station-mapped location scores.
- 52°F
- yearly average temperature, NOAA normal
- 68/100
- comfort score, above 56% of station-mapped location scores
- 47.6"
- yearly precipitation total
- 203 days
- frost-free days per growing season
Cottage Grove Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00351902 · Cottage Grove Dam, OR 52°F mean · 47.6" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 52°F
- RANK-MID #3,431
- PHOTO-FINISH ≈ Corvallis
- PRCP-MID 47.6"
- SWING-NARROW 27°F
- COMF-MID 68/100
- LOAD-HEAT 4,886 HDD
- STN-1 USC00351902
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Corvallis, OR (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every OR station list.
- Cottage Grove D… (this station) 52°F
- Hot Foster Dam, OR 52°F
- Near Corvallis, OR 52°F
- Near Cottage Grove, OR 52°F
- Near Idleyld Park, OR 52°F
Climate Living Index · Cottage Grove Dam
Cottage Grove Dam: 70/100 · grade B
Cottage Grove Dam publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Cottage Grove Dam, not an official NOAA rating. Rankings still use Comfort Score 68/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Frost-free season | 203 days/year | 66/100 · C |
| Precipitation balance | 47.6 in · 12.6 from 35 in | 56/100 · C |
| Annual temperature balance | 52.2°F · 15.3° from 67.5°F | 50/100 · D |
Cottage Grove Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Cottage Grove Dam is a temperate Köppen climate: Csb
Coldest-month mean 39.6°F and warmest-month mean 66.8°F place this station in temperate, dry-summer, warm summer climates (Csb). Class Csb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, dry-summer, warm summer.
- Köppen code
- Csb
- Group
- Temperate
- Warmest month
- 66.8°F
- Coldest month
- 39.6°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Cottage Grove Dam sits across the climate record
Three NOAA fields for Cottage Grove Dam's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 50th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 25% wettest
- Cottage Grove Dam's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 93%
- Warmest-to-coldest month gap for Cottage Grove Dam is compact versus 6,861 complete station-years.
How Cottage Grove Dam compares across U.S. station-mapped locations
Cottage Grove Dam's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
68 Top 44% score exceeds 56% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). This entry sits in this band.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Cottage Grove Dam's measured station temperature trend
MethodologyAcross 60 complete annual observations from 1945 to 2025, COTTAGE GROVE DAM warmed at a fitted rate of 0.20°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Cottage Grove Dam primary station fitted change +0.20 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 48°F (9°C) | 34°F (1°C) | 41°F (5°C) | 6.3" | 13.4 | 0.0 |
| February | 51°F (11°C) | 34°F (1°C) | 43°F (6°C) | 5.1" | 11.8 | 0.0 |
| March | 56°F (13°C) | 36°F (2°C) | 46°F (8°C) | 5.5" | 9.3 | 0.0 |
| April | 60°F (16°C) | 39°F (4°C) | 49°F (10°C) | 4.7" | 2.0 | 0.0 |
| May | 67°F (19°C) | 44°F (6°C) | 55°F (13°C) | 3.1" | 0.4 | 0.2 |
| June | 72°F (22°C) | 48°F (9°C) | 60°F (16°C) | 1.7" | 0.0 | 1.0 |
| July | 81°F (27°C) | 52°F (11°C) | 66°F (19°C) | 0.5" | 0.0 | 4.0 |
| August | 82°F (28°C) | 51°F (11°C) | 67°F (19°C) | 0.5" | 0.0 | 4.5 |
| September | 77°F (25°C) | 48°F (9°C) | 62°F (17°C) | 1.6" | 0.0 | 2.1 |
| October | 65°F (18°C) | 42°F (6°C) | 53°F (12°C) | 3.9" | 1.4 | 0.1 |
| November | 53°F (12°C) | 37°F (3°C) | 45°F (7°C) | 6.4" | 8.2 | 0.0 |
| December | 46°F (8°C) | 33°F (1°C) | 40°F (4°C) | 8.4" | 14.6 | 0.0 |
The year, day by day
The calendar barely moves in Cottage Grove Dam: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 33°F near December 25 and 83°F near July 29.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 33°F around December 25.
The widest day
August 5 carries the biggest normal gap between afternoon and dawn, 31°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Cottage Grove Dam.
Monthly Precipitation
Average monthly rainfall
Cottage Grove Dam's wet season runs through the cold months
December, January and February carry 42% of the year's precipitation here, while June through August contribute 6%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows an unusually narrow 27.2°F seasonal spread.
- Wettest month
- December, 8.4"
- Driest month
- July, 0.5"
- Wettest three months
- December, November, January (44% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
Frost Dates & Growing Season
First Fall Freeze
November 1
50% probability date
Last Spring Freeze
April 12
50% probability date
Growing Season
203 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,886
Higher = more heating needed
Cooling Degree Days
231
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside OR closest to Cottage Grove Dam on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (52°F here).
- Athens, WV 52°F · 0.0°F off
- Crescent City, CA 52°F · 0.0°F off
- Delphi, IN 52°F · 0.0°F off
- Fort Madison, IA 52°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (47.6" here), excluding temperature-peer places.
- Stony Creek, VA 47.6" · 0.0" off
- Cooperstown, NY 47.6" · 0.0" off
- Dover, DE 47.6" · 0.0" off
- Harrisburg, IL 47.6" · 0.0" off
Data-derived climate profile
How Cottage Grove Dam's climate pattern fits together
heating led · wet · low swing
Heating is the larger measured load in Cottage Grove Dam, at 4,886 degree days versus 231 for cooling. Unlike a strongly continental record, however, its 27.2°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
Cottage Grove Dam's frost-free season lasts about 203 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
Cottage Grove Dam's 27.2°F seasonal spread is compact even though precipitation is abundant. August and December mark the typical warm and cold ends of the calendar. The annual average is 52°F. Temperature is relatively steady; the monthly rows show how rain and snow observations vary across the calendar.
Alongside its heating load, Cottage Grove Dam carries 47.6 inches of precipitation in a normal year, inside PlainClimate's wet range. Snowfall is not added to the interpretation because its annual value is missing. That distinction matters because a wet annual total can arrive as rain, snow, or a mixture at different times.
These labels group NOAA 1991-2020 normals from Cottage Grove Dam's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Cottage Grove Dam, not an official NOAA class or a year-ahead forecast.
Questions about Cottage Grove Dam's climate
How much rain does Cottage Grove Dam get? ▼
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Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Cottage Grove Dam's primary station: COTTAGE GROVE DAM (USC00351902). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Cottage Grove Dam; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Cottage Grove Dam comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.