Arlington, WA Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Arlington's primary NOAA station, ARLINGTON.
The climate verdict for Arlington
Water is the standout signal in Arlington, Washington: 49.0 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 49°F. Its climate comfort score of 69/100 (good) lands mid-pack nationally, exceeding 65% of station-mapped location scores.
- 49°F
- yearly average temperature, NOAA normal
- 69/100
- comfort score, above 65% of station-mapped location scores
- 49.0"
- annual precipitation · 4" snow
- 180 days
- growing season, frost-free days
Arlington: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00450257 · Arlington, WA 49°F mean · 49.0" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 49°F
- RANK-COOL #2,470
- PHOTO-FINISH ≈ Sequim
- PRCP-MID 49.0"
- SWING-NARROW 26°F
- COMF-MID 69/100
- LOAD-HEAT 5,834 HDD
- STN-1 USC00450257
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Sequim, WA ( -0.2 °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 Monroe, WA 50°F
- Arlington (this station) 49°F
- Cold Humptulips Salm…, WA 49°F
- Near Sequim, WA 49°F
- Near Vernonia, OR 49°F
Climate Living Index · Arlington
Arlington: 52/100 · grade D
Arlington publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Arlington, not an official NOAA rating. Rankings still use Comfort Score 69/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Snowfall burden | 4.3 inches/year | 72/100 · B |
| Normal heat + freeze calendar | 128 calendar days | 60/100 · C |
| Precipitation balance | 49.0 in · 14.0 from 35 in | 51/100 · D |
| Frost-free season | 180 days/year | 50/100 · D |
| Annual temperature balance | 49.1°F · 18.4° from 67.5°F | 36/100 · F |
Arlington · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Arlington is a temperate Köppen climate: Csb
Coldest-month mean 37.0°F and warmest-month mean 62.6°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
- 62.6°F
- Coldest month
- 37.0°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 Arlington sits across the climate record
Three NOAA fields for Arlington's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 36th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 22% wettest
- Arlington's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 94%
- Warmest-to-coldest month gap for Arlington is compact versus 6,861 complete station-years.
How Arlington compares across U.S. station-mapped locations
Arlington's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
69 Top 35% score exceeds 65% 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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 47°F (9°C) | 29°F (-2°C) | 38°F (3°C) | 5.9" | 0.8" | 17.6 | 0.0 |
| February | 51°F (10°C) | 28°F (-2°C) | 39°F (4°C) | 4.4" | 0.7" | 17.6 | 0.0 |
| March | 54°F (12°C) | 32°F (0°C) | 43°F (6°C) | 5.0" | 0.4" | 15.2 | 0.0 |
| April | 60°F (15°C) | 35°F (2°C) | 48°F (9°C) | 4.3" | 0.0" | 5.2 | 0.1 |
| May | 67°F (19°C) | 41°F (5°C) | 54°F (12°C) | 3.4" | 0.0" | 0.4 | 0.1 |
| June | 71°F (22°C) | 45°F (7°C) | 58°F (15°C) | 2.7" | 0.0" | 0.0 | 0.6 |
| July | 77°F (25°C) | 48°F (9°C) | 63°F (17°C) | 1.1" | 0.0" | 0.0 | 2.0 |
| August | 78°F (25°C) | 47°F (8°C) | 62°F (17°C) | 1.3" | 0.0" | 0.0 | 2.2 |
| September | 72°F (22°C) | 42°F (6°C) | 57°F (14°C) | 2.5" | 0.0" | 0.3 | 0.2 |
| October | 61°F (16°C) | 37°F (3°C) | 49°F (9°C) | 4.9" | 0.0" | 5.1 | 0.0 |
| November | 52°F (11°C) | 31°F (0°C) | 42°F (5°C) | 7.2" | 0.2" | 12.7 | 0.0 |
| December | 46°F (8°C) | 28°F (-2°C) | 37°F (3°C) | 6.2" | 2.2" | 19.4 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 79°F around July 27, short of 90°F on every date, while 128 dates carry a normal low at or below freezing, the coldest 28°F near February 10.
The freezing stretch
The normal low stays at or below 32°F into March 18, then returns to freezing around November 12, covering 128 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is November 22, when 67% of years recorded at least a hundredth of an inch. The driest is July 31 at 18%. Summed across the calendar, that is about 176 wet dates a year.
The widest day
August 30 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 Arlington.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 0.8"
19.9 days with precipitation
Snow: 0.7"
16.2 days with precipitation
Snow: 0.4"
19.3 days with precipitation
16.5 days with precipitation
13.2 days with precipitation
11.8 days with precipitation
6.3 days with precipitation
6.0 days with precipitation
9.9 days with precipitation
16.4 days with precipitation
Snow: 0.2"
20.2 days with precipitation
Snow: 2.2"
20.4 days with precipitation
Arlington 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 34%, with neither reaching the 35% that would mark a distinct wet season. Arlington has no dry season to plan around, though it does carry an unusually narrow 25.6°F seasonal spread.
The gap between the wettest and driest month still matters: November averages 7.2" and July 1.1". The three wettest months together take 39% 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 Arlington's precipitation splits across the calendar
About 176 days a year record measurable precipitation here, carrying 49.0" between them, or roughly 0.28 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 Arlington, but rarely amounts to much
The normals record 4.3 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 2 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
October 19
50% probability date
Last Spring Freeze
April 22
50% probability date
Growing Season
180 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,834
Higher = more heating needed
Cooling Degree Days
55
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside WA closest to Arlington 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 (49°F here).
- Byers, CO 49°F · 0.0°F off
- Crystal Lake, IL 49°F · 0.0°F off
- Greenfield, IA 49°F · 0.0°F off
- Lockport, NY 49°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (49.0" here), excluding temperature-peer places.
- Greenville, MS 49.0" · 0.0" off
- Kite, GA 49.0" · 0.0" off
- Cannelton, IN 49.0" · 0.0" off
- Elkin, NC 49.0" · 0.0" off
Data-derived climate profile
How Arlington's climate pattern fits together
heating led · wet · low swing
Heating is the larger measured load in Arlington, at 5,834 degree days versus 55 for cooling. Unlike a strongly continental record, however, its 25.6°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
Arlington's frost-free season lasts about 180 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
Arlington's 25.6°F seasonal spread is compact even though precipitation is abundant. July and December mark the typical warm and cold ends of the calendar. The annual average is 49°F. Temperature is relatively steady; the monthly rows show how rain and snow observations vary across the calendar.
Alongside its heating load, Arlington carries 49.0 inches of precipitation in a normal year, inside PlainClimate's wet range. Annual snowfall totals 4.3 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 Arlington'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 Arlington, not an official NOAA class or a year-ahead forecast.
Questions about Arlington's climate
How much rain does Arlington get? ▼
How cold does Arlington get in winter? ▼
How much energy does heating and cooling require in Arlington? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Arlington's primary station: ARLINGTON (USC00450257). 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 5302585). Match rule for Arlington: 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 Arlington 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.