Seattle Boeing Fld, 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 Seattle Boeing Fld's primary NOAA station, SEATTLE BOEING FLD.
The climate verdict for Seattle Boeing Fld
A compact 25.8°F seasonal swing gives Seattle Boeing Fld, Washington a steadier-than-extreme annual shape. NOAA reports an annual average of 54°F. Its climate comfort score of 73/100 (good) lands mid-pack nationally, exceeding 66% of station-mapped location scores.
- 54°F
- annual average temperature (NOAA normal)
- 73/100
- comfort score, above 66% of station-mapped location scores
- 36.5"
- yearly precipitation total
- 249 days
- frost-free growing season
Seattle Boeing Fld: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00024234 · Seattle Boeing Fld, WA 54°F mean · 36.5" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 54°F
- RANK-MID #3,842
- PHOTO-FINISH ≈ Kent
- PRCP-MID 36.5"
- SWING-NARROW 26°F
- COMF-MID 73/100
- LOAD-HEAT 4,341 HDD
- STN-1 USW00024234
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Kent, WA (+ 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 WA station list.
- Seattle Boeing… (this station) 54°F
- Cold Renton, WA 54°F
- Hot Kent, WA 54°F
- Near Seattle, WA 54°F
- Near Tacoma, WA 54°F
Climate Living Index · Seattle Boeing Fld
Seattle Boeing Fld: 85/100 · grade A
Seattle Boeing Fld publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals); 1 missing weight rescale to 100.
PlainClimate-derived for Seattle Boeing Fld, not an official NOAA rating. Rankings still use Comfort Score 73/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Summer moisture balance | 52.2°F mean dew point | 97/100 · A |
| Precipitation balance | 36.5 in · 1.5 from 35 in | 93/100 · A |
| Frost-free season | 249 days/year | 88/100 · A |
| Annual temperature balance | 53.8°F · 13.7° from 67.5°F | 55/100 · C |
Seattle Boeing Fld · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Seattle Boeing Fld is a temperate Köppen climate: Csb
Coldest-month mean 42.0°F and warmest-month mean 67.8°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
- 67.8°F
- Coldest month
- 42.0°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 Seattle Boeing Fld sits across the climate record
Three NOAA fields for Seattle Boeing Fld's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 56th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 51st percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 94%
- Warmest-to-coldest month gap for Seattle Boeing Fld is compact versus 6,861 complete station-years.
How Seattle Boeing Fld compares across U.S. station-mapped locations
Seattle Boeing Fld's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
73 Top 34% score exceeds 66% 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%). Below this entry.
- 70–80: 650 station-mapped locations (11%). This entry sits in this band.
- 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
Seattle Boeing Fld's measured station temperature trend
MethodologyAcross 47 complete annual observations from 1948 to 2025, SEATTLE BOEING FLD warmed at a fitted rate of 0.15°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Seattle Boeing Fld primary station fitted change +0.15 °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 | 49°F (9°C) | 37°F (3°C) | 43°F (6°C) | 5.2" | 7.0 | 0.0 |
| February | 51°F (10°C) | 37°F (3°C) | 44°F (7°C) | 3.7" | 7.0 | 0.0 |
| March | 55°F (13°C) | 39°F (4°C) | 47°F (8°C) | 3.9" | 3.0 | 0.0 |
| April | 60°F (15°C) | 44°F (6°C) | 52°F (11°C) | 2.9" | 0.3 | 0.0 |
| May | 67°F (19°C) | 49°F (10°C) | 58°F (14°C) | 2.0" | 0.2 | 0.0 |
| June | 71°F (22°C) | 54°F (12°C) | 63°F (17°C) | 1.2" | 0.0 | 0.5 |
| July | 77°F (25°C) | 58°F (14°C) | 67°F (20°C) | 0.6" | 0.0 | 1.5 |
| August | 77°F (25°C) | 58°F (15°C) | 68°F (20°C) | 0.8" | 0.0 | 1.1 |
| September | 72°F (22°C) | 54°F (12°C) | 63°F (17°C) | 1.4" | 0.0 | 0.0 |
| October | 61°F (16°C) | 46°F (8°C) | 54°F (12°C) | 3.5" | 0.3 | 0.0 |
| November | 53°F (12°C) | 40°F (4°C) | 46°F (8°C) | 5.8" | 4.2 | 0.0 |
| December | 48°F (9°C) | 36°F (2°C) | 42°F (6°C) | 5.5" | 7.9 | 0.0 |
The year, day by day
The calendar barely moves in Seattle Boeing Fld: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 36°F near December 19 and 79°F near July 26.
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 December 19.
Where the wet dates fall
The likeliest wet date is January 3, when 62% of years recorded at least a hundredth of an inch. The driest is July 27 at 11%. Summed across the calendar, that is about 154 wet dates a year.
The widest day
July 17 carries the biggest normal gap between afternoon and dawn, 20°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Seattle Boeing Fld.
Where Seattle Boeing Fld Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 20°F.
Seattle Boeing Fld 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
18.9 days with precipitation
15.9 days with precipitation
17.7 days with precipitation
14.8 days with precipitation
11.4 days with precipitation
8.5 days with precipitation
3.4 days with precipitation
4.0 days with precipitation
8.5 days with precipitation
14.8 days with precipitation
18.0 days with precipitation
18.3 days with precipitation
Seattle Boeing Fld's wet season runs through the cold months
December, January and February carry 39% of the year's precipitation here, while June through August contribute 7%. 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 25.8°F seasonal spread.
- Wettest month
- November, 5.8"
- Driest month
- July, 0.6"
- Wettest three months
- November, December, January (45% 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.
How Seattle Boeing Fld's precipitation splits across the calendar
About 154 days a year record measurable precipitation here, carrying 36.5" between them, or roughly 0.24 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.
Frost Dates & Growing Season
First Fall Freeze
November 17
50% probability date
Last Spring Freeze
March 13
50% probability date
Growing Season
249 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,341
Higher = more heating needed
Cooling Degree Days
282
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 78% | 6.0 | N/A | N/A |
| February | 73% | 6.0 | 30% | 39% |
| March | 70% | 6.5 | 30% | 40% |
| April | 65% | 6.3 | 26% | 32% |
| May | 64% | 5.9 | 27% | 32% |
| June | 61% | 5.5 | 39% | 22% |
| July | 61% | 5.3 | 51% | 18% |
| August | 64% | 5.1 | 48% | 15% |
| September | 72% | 4.9 | 52% | 22% |
| October | 78% | 5.4 | N/A | N/A |
| November | 79% | 5.8 | N/A | N/A |
| December | 80% | 5.6 | N/A | N/A |
Nationwide similar cities
Other rankable U.S. places outside WA closest to Seattle Boeing Fld 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 (54°F here).
- Ashland, KY 54°F · 0.0°F off
- Cheviot, OH 54°F · 0.0°F off
- Emporia, KS 54°F · 0.0°F off
- Eskridge, KS 54°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (36.5" here), excluding temperature-peer places.
- Red Rock, OK 36.5" · 0.0" off
- Tipton, IA 36.5" · 0.0" off
- Albia, IA 36.5" · 0.0" off
- Colo, IA 36.5" · 0.0" off
Data-derived climate profile
How Seattle Boeing Fld's climate pattern fits together
heating led · moderate · low swing
Heating is the larger measured load in Seattle Boeing Fld, at 4,341 degree days versus 282 for cooling. Unlike a strongly continental record, however, its 25.8°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
The frost-free window extends for about 249 days. That is a long calendar measure, but it is not a forecast and does not combine heat, rainfall, soil, or local elevation into a planting recommendation.
Temperature varies within a narrow 25.8°F band across the normal year. August and December mark the typical warm and cold ends of the calendar. The annual average is 54°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
Seattle Boeing Fld's 36.5 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Seattle Boeing Fld'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 Seattle Boeing Fld, not an official NOAA class or a year-ahead forecast.
Questions about Seattle Boeing Fld's climate
How much rain does Seattle Boeing Fld get? ▼
How much energy does heating and cooling require in Seattle Boeing Fld? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Seattle Boeing Fld's primary station: SEATTLE BOEING FLD (USW00024234). 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 Seattle Boeing Fld; 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 Seattle Boeing Fld 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.