Coos Bay, OR Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Coos Bay's primary NOAA station, COOS BAY 8 SW.
The climate verdict for Coos Bay
Water is the standout signal in Coos Bay, Oregon: 65.3 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 51°F. At 45/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 16% of scores.
- 51°F
- annual average temperature (NOAA normal)
- 45/100
- comfort score, above 16% of station-mapped location scores
- 65.3"
- yearly precipitation total
- 199 days
- growing season, frost-free days
Coos Bay: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00004141 · Coos Bay, OR 51°F mean · 65.3" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-WET · SWING-NARROW · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 51°F
- RANK-MID #2,882
- PHOTO-FINISH ≈ Newport
- PRCP-WET 65.3"
- SWING-NARROW 14°F
- COMF-LOW 45/100
- LOAD-HEAT 5,295 HDD
- STN-1 USW00004141
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Newport, OR (+ 0.1 °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.
- Coos Bay (this station) 51°F
- Hot Naselle, WA 51°F
- Near Newport, OR 51°F
- Cold Florence, OR 50°F
- Near Clearwater, WA 50°F
Climate Living Index · Coos Bay
Coos Bay: 56/100 · grade C
Coos Bay publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Coos Bay, not an official NOAA rating. Rankings still use Comfort Score 45/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Frost-free season | 199 days/year | 64/100 · C |
| Annual temperature balance | 50.5°F · 17.0° from 67.5°F | 43/100 · D |
| Precipitation balance | 65.3 in · 30.3 from 35 in | 0/100 · F |
Coos Bay · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Coos Bay is a temperate Köppen climate: Csb
Coldest-month mean 43.8°F and warmest-month mean 58.0°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
- 58.0°F
- Coldest month
- 43.8°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 Coos Bay sits across the climate record
Three NOAA fields for Coos Bay's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 42nd percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 3% wettest
- Coos Bay's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 99%
- Warmest-to-coldest month gap for Coos Bay is compact versus 6,861 complete station-years.
How Coos Bay compares across U.S. station-mapped locations
Coos Bay's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
45 16th percentile score exceeds 16% 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%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 52°F (11°C) | 36°F (2°C) | 44°F (7°C) | 10.7" | 11.0 | 0.0 |
| February | 54°F (12°C) | 37°F (3°C) | 45°F (7°C) | 8.5" | 9.6 | 0.0 |
| March | 56°F (13°C) | 38°F (3°C) | 47°F (8°C) | 8.4" | 7.8 | 0.0 |
| April | 57°F (14°C) | 39°F (4°C) | 48°F (9°C) | 5.5" | 3.4 | 0.0 |
| May | 60°F (15°C) | 44°F (7°C) | 52°F (11°C) | 2.9" | 0.6 | 0.0 |
| June | 62°F (17°C) | 47°F (8°C) | 55°F (13°C) | 2.5" | 0.0 | 0.0 |
| July | 64°F (18°C) | 51°F (10°C) | 57°F (14°C) | 0.5" | 0.0 | 0.0 |
| August | 66°F (19°C) | 50°F (10°C) | 58°F (14°C) | 0.5" | 0.0 | 0.0 |
| September | 66°F (19°C) | 47°F (8°C) | 56°F (13°C) | 1.8" | 0.0 | 0.2 |
| October | 63°F (17°C) | 42°F (5°C) | 52°F (11°C) | 4.2" | 3.0 | 0.0 |
| November | 56°F (13°C) | 39°F (4°C) | 48°F (9°C) | 9.0" | 6.3 | 0.0 |
| December | 51°F (11°C) | 36°F (2°C) | 44°F (7°C) | 10.9" | 12.1 | 0.0 |
The year, day by day
The calendar barely moves in Coos Bay: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 36°F near January 1 and 67°F near August 30.
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 36°F around January 1.
Where the wet dates fall
The likeliest wet date is March 23, when 70% of years recorded at least a hundredth of an inch. The driest is July 27 at 23%. Summed across the calendar, that is about 181 wet dates a year.
The widest day
October 8 carries the biggest normal gap between afternoon and dawn, 21°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Coos Bay.
Where Coos Bay Stands Nationally
This is one of the wettest normals climates ranked: about 65 inches of precipitation in a normal year, a total fewer than one station in ten surpasses.
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 21°F.
Coos Bay earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
18.2 days with precipitation
19.3 days with precipitation
20.8 days with precipitation
19.0 days with precipitation
15.6 days with precipitation
11.9 days with precipitation
7.1 days with precipitation
8.2 days with precipitation
7.9 days with precipitation
14.2 days with precipitation
18.5 days with precipitation
20.1 days with precipitation
Coos Bay's wet season runs through the cold months
December, January and February carry 46% of the year's precipitation here, while June through August contribute 5%. 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 14.2°F seasonal spread.
- Wettest month
- December, 10.9"
- Driest month
- August, 0.5"
- Wettest three months
- December, January, November (47% 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.
When it rains in Coos Bay, it arrives in quantity
65.3" of precipitation falls across only about 181 wet days here, averaging 0.36 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 181 a year, 50% of all days
- Average depth per wet day
- 0.36 inches
- Most wet days
- March, about 21
- Fewest wet days
- July, about 7
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Frost Dates & Growing Season
First Fall Freeze
October 31
50% probability date
Last Spring Freeze
April 15
50% probability date
Growing Season
199 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,295
Higher = more heating needed
Cooling Degree Days
0
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside OR closest to Coos Bay 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 (51°F here).
- Chenoa, IL 51°F · 0.0°F off
- Columbus, NE 51°F · 0.0°F off
- Crook, CO 51°F · 0.0°F off
- Fremont, NE 51°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (65.3" here), excluding temperature-peer places.
- Franklin, LA 65.3" · 0.1" off
- Houma, LA 65.4" · 0.1" off
- Jeanerette, LA 65.5" · 0.1" off
- Cleveland, GA 65.2" · 0.2" off
Data-derived climate profile
How Coos Bay's climate pattern fits together
heating led · wet · low swing
Heating is the larger measured load in Coos Bay, at 5,295 degree days versus 0 for cooling. Unlike a strongly continental record, however, its 14.2°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
Coos Bay's frost-free season lasts about 199 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
Coos Bay's 14.2°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 51°F. Temperature is relatively steady; the monthly rows show how rain and snow observations vary across the calendar.
Alongside its heating load, Coos Bay carries 65.3 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 Coos Bay'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 Coos Bay, not an official NOAA class or a year-ahead forecast.
Questions about Coos Bay's climate
How much rain does Coos Bay get? ▼
How much energy does heating and cooling require in Coos Bay? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Coos Bay's primary station: COOS BAY 8 SW (USW00004141). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 4115250). Match rule for Coos Bay: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Coos Bay 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.