Scappoose, Oregon climate: Normal weather by month, frost dates and records
Scappoose's normal year runs from 34°F December nights to 82°F August afternoons, with 42.3 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.7°C, December lows of 1°C, August highs of 28°C, 1,075 mm of precipitation a year.
- NOAA stationScappoose Ind Airport
- Station IDUSW00004201
- Location45.77°N 122.86°W
- Elevation55 ft (17 m)
- Population8,282
On October 14, the normal high in Scappoose is 64°F and the normal low 43°F, and the chance of measurable rain or snow is 47%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Scappoose.
- Jan 47° 34°
- Feb 51° 34°
- Mar 56° 37°
- Apr 61° 40°
- May 68° 46°
- Jun 73° 51°
- Jul 81° 55°
- Aug 82° 54°
- Sep 76° 50°
- Oct 64° 43°
- Nov 53° 37°
- Dec 46° 34°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Scappoose each month?
August is the warmest month, with normal highs of 82°F; December the coldest, with normal lows of 34°F. The most precipitation falls in December (7.25 in), the least in July (0.48 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 47°F | 34°F | 40.3°F | 6.54 | 21 | <1 | 13 | 9 h |
| February | 51°F | 34°F | 42.7°F | 4.62 | 17 | <1 | 13 | 10 h 20 min |
| March | 56°F | 37°F | 46.6°F | 4.54 | 19 | <1 | 8 | 11 h 50 min |
| April | 61°F | 40°F | 50.5°F | 3.08 | 17 | <1 | 3 | 13 h 30 min |
| May | 68°F | 46°F | 57.2°F | 2.49 | 13 | 1 | <1 | 14 h 50 min |
| June | 73°F | 51°F | 61.8°F | 1.37 | 10 | 2 | <1 | 15 h 40 min |
| July | 81°F | 55°F | 67.7°F | 0.48 | 4 | 5 | <1 | 15 h 20 min |
| August | 82°F | 54°F | 68.2°F | 0.52 | 4 | 5 | <1 | 14 h 10 min |
| September | 76°F | 50°F | 63.0°F | 1.56 | 8 | 2 | <1 | 12 h 40 min |
| October | 64°F | 43°F | 53.2°F | 3.60 | 15 | <1 | 2 | 11 h |
| November | 53°F | 37°F | 44.8°F | 6.26 | 19 | <1 | 9 | 9 h 30 min |
| December | 46°F | 34°F | 39.9°F | 7.25 | 20 | <1 | 13 | 8 h 40 min |
| Year (annual) | 63°F | 43°F | 53.0°F | 42.31 | 166 | 14 | 61 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 8°C | 1°C | 4.6°C | 166 mm |
| February | 11°C | 1°C | 5.9°C | 117 mm |
| March | 13°C | 3°C | 8.1°C | 115 mm |
| April | 16°C | 4°C | 10.3°C | 78 mm |
| May | 20°C | 8°C | 14.0°C | 63 mm |
| June | 23°C | 10°C | 16.6°C | 35 mm |
| July | 27°C | 13°C | 19.8°C | 12 mm |
| August | 28°C | 12°C | 20.1°C | 13 mm |
| September | 25°C | 10°C | 17.2°C | 40 mm |
| October | 18°C | 6°C | 11.8°C | 91 mm |
| November | 11°C | 3°C | 7.1°C | 159 mm |
| December | 8°C | 1°C | 4.4°C | 184 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Hazel Dell (12 miles away), gets 1 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004201; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Scappoose?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, July has the fewest days with rain (4).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004201.
When is the last frost in Scappoose?
In Scappoose, the last spring frost (32°F) comes after April 10 in half of years and after May 1 in one year in ten; the first autumn frost comes before November 2 in half of years and before October 16 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 101 year in 10 after May 1; 9 in 10 after March 17
- First autumn frost, half of years before
- November 21 year in 10 before October 16; 9 in 10 before November 23
NOAA puts the median frost-free season at 209 days, and the season without a hard freeze (28°F) at 259 days.
A hard freeze (28°F) comes after March 3 in half of springs and before November 19 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Scappoose in zone 8b in ZIP code 97053, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Scappoose's NOAA station is in zone 8b: the coldest night of a typical year reaches 17°F (20 complete years).
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00004201; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Scappoose?
In a normal year in Scappoose, 14 days a year reach 90°F (1 of them 100°F or more), 61 nights fall to 32°F or colder and 166 days bring measurable precipitation.
- Days at 90°F or more
- 14a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 61a normal year
- Days that stay below freezing
- 2high of 32°F or less
- Days with 0.01 inch of precipitation
- 166a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USW00004201.
How sunny is Scappoose?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Scappoose, 3.7 kWh per square metre a day. July is the sunniest month (83%) and December the cloudiest (52%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 54% | 1.2 |
| February | 60% | 2.1 |
| March | 59% | 3.0 |
| April | 63% | 4.3 |
| May | 68% | 5.4 |
| June | 70% | 6.0 |
| July | 83% | 6.8 |
| August | 83% | 5.8 |
| September | 78% | 4.3 |
| October | 67% | 2.6 |
| November | 56% | 1.4 |
| December | 52% | 1.0 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Scappoose need?
A normal year in Scappoose brings 4,692 heating degree days, 13% fewer than the median U.S. place (5,373), and 335 cooling degree days, 63% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,345 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 766 | 0 |
| February | 624 | 0 |
| March | 571 | 0 |
| April | 437 | 1 |
| May | 253 | 11 |
| June | 130 | 35 |
| July | 31 | 116 |
| August | 25 | 124 |
| September | 103 | 45 |
| October | 368 | 2 |
| November | 606 | 0 |
| December | 778 | 0 |
| Year (annual) | 4,692 | 335 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004201. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Scappoose been warmer than normal lately?
2025 averaged 54.3°F, 1.3°F above the 1991-2020 normal of 53.0°F. 2 of the 2 complete years since 2023 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2023 | 54.4°F | +1.4°F | 34.70 |
| 2025 | 54.3°F | +1.3°F | 30.19 |
Source: observed years: ACIS, station USW00004201. A year counts only with all twelve months complete.
How does Scappoose's climate compare?
Scappoose is warmer than 68 of the other 104 places with their own NOAA record in Oregon, and wetter than 57. Across the 7,247 U.S. stations with normals, its annual mean of 53.0°F is warmer than 54%.
In the Köppen classification computed from these normals, Scappoose is Csb: temperate, dry-summer, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Scappoose share this climate record?
4 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Ridgefield, WA15,359 people · 10 mi E
- Felida, WA10,695 people · 8 mi SE
- Duluth, WA2,040 people · 10 mi E
- Dollars Corner, WA510 people · 13 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Scappoose's climate
What is the coldest month in Scappoose?
December, with a normal high of 46°F and a normal low of 34°F. The warmest is August (82°F by day, 54°F at night).
Does it snow in Scappoose?
Rarely. NOAA publishes no 1991-2020 snowfall normal for Scappoose's NOAA station; the nearest record that keeps one, Hazel Dell (12 miles away), records 1 inches of snow in a normal year.
What is the rainiest month in Scappoose?
December, with 7.25 in of precipitation in a normal year; the driest is July with 0.48 in.
What plant hardiness zone is Scappoose in?
The USDA's 2023 map puts Scappoose in zone 8b in ZIP code 97053, the nearest ZIP area. By the same method at Scappoose's NOAA station, the coldest night of a typical year reaches 17°F (20 years, 1991-2020): zone 8b.
How late can frost come in Scappoose?
In half of years the last 32°F night comes after April 10; in one year in ten it comes after May 1. Waiting until May 1 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- St. Helens, OR6 miles from this station, 51.6°F a year
- Hazel Dell, WA12 miles from this station, 51.0°F a year
- Vancouver, WA14 miles from this station, 54.0°F a year
- Battle Ground, WA16 miles from this station, 50.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made