Headworks Portland Wtr B, 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 Headworks Portland Wtr B's primary NOAA station, HEADWORKS PORTLAND WTR B.
The climate verdict for Headworks Portland Wtr B
Water is the standout signal in Headworks Portland Wtr B, Oregon: 79.0 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 51°F. At 53/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 31% of scores.
- 51°F
- annual average temperature (NOAA normal)
- 53/100
- comfort score, above 31% of station-mapped location scores
- 79.0"
- annual precipitation · 3" snow
- 236 days
- frost-free growing season
Headworks Portland Wtr B: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00353770 · Headworks Portland Wtr B, OR 51°F mean · 79.0" 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 #3,156
- PHOTO-FINISH ≈ Lacomb
- PRCP-WET 79.0"
- SWING-NARROW 27°F
- COMF-LOW 53/100
- LOAD-HEAT 5,144 HDD
- STN-1 USC00353770
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Lacomb, 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.
- Hot Mayfield Pwr Plt, WA 52°F
- Near Saint Helens Rfd, OR 52°F
- Headworks Portl… (this station) 51°F
- Cold Matlock, WA 51°F
- Near Lacomb, OR 51°F
Climate Living Index · Headworks Portland Wtr B
Headworks Portland Wtr B: 61/100 · grade C
Headworks Portland Wtr B publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Headworks Portland Wtr B, not an official NOAA rating. Rankings still use Comfort Score 53/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Frost-free season | 236 days/year | 83/100 · B |
| Snowfall burden | 2.9 inches/year | 74/100 · B |
| Annual temperature balance | 51.4°F · 16.1° from 67.5°F | 46/100 · D |
| Precipitation balance | 79.0 in · 44.0 from 35 in | 0/100 · F |
Headworks Portland Wtr B · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Headworks Portland Wtr B is a temperate Köppen climate: Csb
Coldest-month mean 39.1°F and warmest-month mean 65.9°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
- 65.9°F
- Coldest month
- 39.1°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 Headworks Portland Wtr B sits across the climate record
Three NOAA fields for Headworks Portland Wtr B'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 1% wettest
- Headworks Portland Wtr B'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 Headworks Portland Wtr B is compact versus 6,861 complete station-years.
How Headworks Portland Wtr B compares across U.S. station-mapped locations
Headworks Portland Wtr B's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
53 31st percentile score exceeds 31% 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%). This entry sits in this band.
- 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
Headworks Portland Wtr B's measured station temperature trend
MethodologyAcross 94 complete annual observations from 1900 to 2025, HEADWORKS PORTLAND WTR B 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.
- Headworks Portland Wtr B 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 | 44°F (7°C) | 35°F (2°C) | 40°F (4°C) | 10.3" | 0.7" | 8.9 | 0.0 |
| February | 47°F (8°C) | 36°F (2°C) | 42°F (5°C) | 8.0" | 1.2" | 7.0 | 0.0 |
| March | 52°F (11°C) | 37°F (3°C) | 45°F (7°C) | 8.5" | 0.2" | 4.3 | 0.0 |
| April | 57°F (14°C) | 41°F (5°C) | 49°F (9°C) | 7.3" | 0.0" | 0.5 | 0.0 |
| May | 64°F (18°C) | 46°F (8°C) | 55°F (13°C) | 5.7" | 0.0" | 0.0 | 0.4 |
| June | 69°F (21°C) | 50°F (10°C) | 59°F (15°C) | 4.0" | 0.0" | 0.0 | 0.9 |
| July | 77°F (25°C) | 54°F (12°C) | 65°F (18°C) | 0.9" | 0.0" | 0.0 | 3.4 |
| August | 78°F (25°C) | 54°F (12°C) | 66°F (19°C) | 1.2" | 0.0" | 0.0 | 3.5 |
| September | 72°F (22°C) | 51°F (11°C) | 61°F (16°C) | 3.4" | 0.0" | 0.0 | 1.5 |
| October | 60°F (16°C) | 45°F (7°C) | 53°F (11°C) | 7.4" | 0.0" | 0.3 | 0.1 |
| November | 49°F (10°C) | 40°F (4°C) | 44°F (7°C) | 10.6" | 0.2" | 2.9 | 0.0 |
| December | 43°F (6°C) | 35°F (2°C) | 39°F (4°C) | 11.7" | 0.6" | 8.1 | 0.0 |
The year, day by day
The calendar barely moves in Headworks Portland Wtr B: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 34°F near December 25 and 79°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 25.
Where the wet dates fall
The likeliest wet date is December 13, when 74% of years recorded at least a hundredth of an inch. The driest is July 31 at 14%. Summed across the calendar, that is about 191 wet dates a year.
The widest day
August 5 carries the biggest normal gap between afternoon and dawn, 24°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Headworks Portland Wtr B.
Where Headworks Portland Wtr B Stands Nationally
This is one of the wettest normals climates ranked: about 79 inches of precipitation in a normal year, a total fewer than one station in ten surpasses.
Headworks Portland Wtr B 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: 0.7"
21.8 days with precipitation
Snow: 1.2"
18.3 days with precipitation
Snow: 0.2"
21.4 days with precipitation
20.3 days with precipitation
16.1 days with precipitation
12.4 days with precipitation
5.4 days with precipitation
5.0 days with precipitation
8.7 days with precipitation
16.9 days with precipitation
Snow: 0.2"
21.2 days with precipitation
Snow: 0.6"
22.8 days with precipitation
Headworks Portland Wtr B's wet season runs through the cold months
December, January and February carry 38% of the year's precipitation here, while June through August contribute 8%. 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 26.8°F seasonal spread.
- Wettest month
- December, 11.7"
- Driest month
- July, 0.9"
- Wettest three months
- December, November, January (41% 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 Headworks Portland Wtr B, it arrives in quantity
79.0" of precipitation falls across only about 190 wet days here, averaging 0.41 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 190 a year, 52% of all days
- Average depth per wet day
- 0.41 inches
- Most wet days
- December, about 23
- Fewest wet days
- August, about 5
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.
Snow reaches Headworks Portland Wtr B, but rarely amounts to much
The normals record 2.9 inches of snow a year here, most likely in February. 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
November 18
50% probability date
Last Spring Freeze
March 27
50% probability date
Growing Season
236 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,144
Higher = more heating needed
Cooling Degree Days
209
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside OR closest to Headworks Portland Wtr B 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).
- Aberdeen, WA 51°F · 0.0°F off
- Beatrice, NE 51°F · 0.0°F off
- Brockton, MA 51°F · 0.0°F off
- Cedar City, UT 51°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (79.0" here), excluding temperature-peer places.
- Klamath, CA 78.9" · 0.1" off
- Kodiak, AK 78.3" · 0.6" off
- Valdez, AK 82.1" · 3.1" off
- Point Baker, AK 82.3" · 3.3" off
Data-derived climate profile
How Headworks Portland Wtr B's climate pattern fits together
heating led · wet · low swing
Heating is the larger measured load in Headworks Portland Wtr B, at 5,144 degree days versus 209 for cooling. Unlike a strongly continental record, however, its 26.8°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
Headworks Portland Wtr B's frost-free season lasts about 236 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
Headworks Portland Wtr B's 26.8°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, Headworks Portland Wtr B carries 79.0 inches of precipitation in a normal year, inside PlainClimate's wet range. Annual snowfall totals 2.9 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 Headworks Portland Wtr B'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 Headworks Portland Wtr B, not an official NOAA class or a year-ahead forecast.
Questions about Headworks Portland Wtr B's climate
How much rain does Headworks Portland Wtr B 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 Headworks Portland Wtr B's primary station: HEADWORKS PORTLAND WTR B (USC00353770). 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 Headworks Portland Wtr B; 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 Headworks Portland Wtr B 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.