Sedro-woolley, WA 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 Sedro-woolley's primary NOAA station, SEDRO-WOOLLEY.
The climate verdict for Sedro-woolley
Water is the standout signal in Sedro-woolley, Washington: 48.5 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 51°F. Its climate comfort score of 68/100 (good) lands mid-pack nationally, exceeding 56% of station-mapped location scores.
- 51°F
- annual average temperature (NOAA normal)
- 68/100
- comfort score, above 56% of station-mapped location scores
- 48.5"
- annual precipitation · 6" snow
- 224 days
- frost-free days per growing season
Sedro-woolley: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00457507 · Sedro-woolley, WA 51°F mean · 48.5" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 51°F
- RANK-MID #3,156
- PHOTO-FINISH ≈ Bellingham
- PRCP-MID 48.5"
- SWING-NARROW 25°F
- COMF-MID 68/100
- LOAD-HEAT 5,070 HDD
- STN-1 USC00457507
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Bellingham, WA ( -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 WA station list.
- Hot Centralia, WA 52°F
- Sedro-woolley (this station) 51°F
- Cold Bellingham, WA 51°F
- Near Everett Snohomi…, WA 51°F
- Near Shelton Sanders…, WA 51°F
Climate Living Index · Sedro-woolley
Sedro-woolley: 70/100 · grade B
Sedro-woolley publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Sedro-woolley, 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 | 224 days/year | 79/100 · B |
| Snowfall burden | 5.7 inches/year | 70/100 · B |
| Precipitation balance | 48.5 in · 13.5 from 35 in | 52/100 · D |
| Annual temperature balance | 51.3°F · 16.2° from 67.5°F | 46/100 · D |
Sedro-woolley · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Sedro-woolley is a temperate Köppen climate: Csb
Coldest-month mean 39.5°F and warmest-month mean 64.0°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
- 64.0°F
- Coldest month
- 39.5°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 Sedro-woolley sits across the climate record
Three NOAA fields for Sedro-woolley's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 46th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 23% wettest
- Sedro-woolley's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 95%
- Warmest-to-coldest month gap for Sedro-woolley is compact versus 6,861 complete station-years.
How Sedro-woolley compares across U.S. station-mapped locations
Sedro-woolley'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
Sedro-woolley's measured station temperature trend
MethodologyAcross 84 complete annual observations from 1897 to 2025, SEDRO-WOOLLEY warmed at a fitted rate of 0.11°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Sedro-woolley primary station fitted change +0.11 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 46°F (8°C) | 35°F (2°C) | 40°F (5°C) | 6.2" | 0.6" | 12.2 | 0.0 |
| February | 49°F (9°C) | 35°F (2°C) | 42°F (5°C) | 4.1" | 0.2" | 9.6 | 0.0 |
| March | 53°F (12°C) | 38°F (3°C) | 45°F (7°C) | 4.8" | 0.4" | 5.0 | 0.0 |
| April | 58°F (15°C) | 41°F (5°C) | 50°F (10°C) | 4.2" | 0.0" | 1.3 | 0.0 |
| May | 65°F (18°C) | 47°F (8°C) | 56°F (13°C) | 3.5" | 0.0" | 0.2 | 0.0 |
| June | 69°F (20°C) | 51°F (10°C) | 60°F (15°C) | 2.6" | 0.0" | 0.0 | 0.0 |
| July | 75°F (24°C) | 53°F (12°C) | 64°F (18°C) | 1.3" | 0.0" | 0.0 | 0.4 |
| August | 75°F (24°C) | 53°F (12°C) | 64°F (18°C) | 1.6" | 0.0" | 0.0 | 0.1 |
| September | 70°F (21°C) | 49°F (10°C) | 59°F (15°C) | 2.9" | 0.0" | 0.0 | 0.0 |
| October | 60°F (15°C) | 43°F (6°C) | 51°F (11°C) | 5.0" | 0.1" | 1.4 | 0.0 |
| November | 50°F (10°C) | 39°F (4°C) | 45°F (7°C) | 7.0" | 0.7" | 5.6 | 0.0 |
| December | 45°F (7°C) | 34°F (1°C) | 40°F (4°C) | 5.5" | 3.7" | 11.0 | 0.0 |
The year, day by day
The calendar barely moves in Sedro-woolley: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 34°F near December 20 and 76°F near July 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 34°F around December 20.
Where the wet dates fall
The likeliest wet date is November 19, when 69% of years recorded at least a hundredth of an inch. The driest is July 31 at 19%. Summed across the calendar, that is about 186 wet dates a year.
The widest day
August 4 carries the biggest normal gap between afternoon and dawn, 23°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Sedro-woolley.
Where Sedro-woolley Stands Nationally
Days and nights track unusually close together; the widest normal swing, about 23°F, is narrower than most stations record.
Sedro-woolley earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 0.6"
19.6 days with precipitation
Snow: 0.2"
17.2 days with precipitation
Snow: 0.4"
20.1 days with precipitation
17.1 days with precipitation
13.9 days with precipitation
12.6 days with precipitation
6.8 days with precipitation
7.0 days with precipitation
12.2 days with precipitation
Snow: 0.1"
17.8 days with precipitation
Snow: 0.7"
21.2 days with precipitation
Snow: 3.7"
20.5 days with precipitation
Sedro-woolley spreads its precipitation across the year
Neither half of the year dominates here: June through August take 11% of the annual total and December through February 32%, with neither reaching the 35% that would mark a distinct wet season. Sedro-woolley has no dry season to plan around, though it does carry an unusually narrow 24.5°F seasonal spread.
The gap between the wettest and driest month still matters: November averages 7.0" and July 1.3". The three wettest months together take 38% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
How Sedro-woolley's precipitation splits across the calendar
About 186 days a year record measurable precipitation here, carrying 48.5" between them, or roughly 0.26 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Snow reaches Sedro-woolley, but rarely amounts to much
The normals record 5.7 inches of snow a year here, most likely in December. That is a real but marginal amount: enough that snow is part of the local record, not enough to define the winter.
A figure in this range usually reflects a handful of events that melt quickly rather than a season of accumulation; about 3 days a year record any measurable snow at all.
NOAA 1991-2020 normals. An average across thirty years can smooth away a single heavy winter, so a small annual figure does not mean a significant snowfall is impossible.
Frost Dates & Growing Season
First Fall Freeze
November 6
50% probability date
Last Spring Freeze
March 27
50% probability date
Growing Season
224 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,070
Higher = more heating needed
Cooling Degree Days
86
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside WA closest to Sedro-woolley 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).
- Aurora, NE 51°F · 0.0°F off
- Barnesville, OH 51°F · 0.0°F off
- Cashtown, PA 51°F · 0.0°F off
- Danbury, CT 51°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (48.5" here), excluding temperature-peer places.
- Jefferson City, TN 48.5" · 0.0" off
- Bamberg, SC 48.5" · 0.0" off
- Hartsville, SC 48.5" · 0.0" off
- Hawkinsville, GA 48.5" · 0.0" off
Data-derived climate profile
How Sedro-woolley's climate pattern fits together
heating led · wet · low swing
Heating is the larger measured load in Sedro-woolley, at 5,070 degree days versus 86 for cooling. Unlike a strongly continental record, however, its 24.5°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
Sedro-woolley's frost-free season lasts about 224 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
Sedro-woolley's 24.5°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, Sedro-woolley carries 48.5 inches of precipitation in a normal year, inside PlainClimate's wet range. Annual snowfall totals 5.7 inches. 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 Sedro-woolley'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 Sedro-woolley, not an official NOAA class or a year-ahead forecast.
Questions about Sedro-woolley's climate
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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 Sedro-woolley's primary station: SEDRO-WOOLLEY (USC00457507). 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 5363210). Match rule for Sedro-woolley: 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 Sedro-woolley 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.