Arlington, Oregon climate: Normal weather by month, frost dates and records
Arlington's normal year runs from 30°F January nights to 90°F July afternoons, with 9.3 inches of precipitation and 5 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.4°C, January lows of −1°C, July highs of 32°C, 236 mm of precipitation a year.
- NOAA stationArlington
- Station IDUSC00350265
- Location45.72°N 120.21°W
- Elevation277 ft (84 m)
- Population620
On October 23, the normal high in Arlington is 62°F and the normal low 40°F, and the chance of measurable rain or snow is 24%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Arlington.
- Jan 41° 30°
- Feb 47° 31°
- Mar 56° 36°
- Apr 64° 42°
- May 73° 50°
- Jun 80° 57°
- Jul 90° 63°
- Aug 89° 62°
- Sep 80° 53°
- Oct 66° 42°
- Nov 50° 34°
- Dec 41° 30°
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 Arlington each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 30°F. The most precipitation falls in December (1.66 in), the least in July (0.10 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 41°F | 30°F | 35.3°F | 1.47 | 2.0 | 11 | <1 | 16 | 9 h |
| February | 47°F | 31°F | 38.7°F | 0.98 | 1.2 | 8 | <1 | 15 | 10 h 20 min |
| March | 56°F | 36°F | 45.6°F | 0.83 | 0.2 | 9 | <1 | 8 | 11 h 50 min |
| April | 64°F | 42°F | 52.8°F | 0.61 | 0.0 | 6 | <1 | 2 | 13 h 30 min |
| May | 73°F | 50°F | 61.7°F | 0.75 | 0.0 | 7 | 2 | <1 | 14 h 50 min |
| June | 80°F | 57°F | 68.2°F | 0.48 | 0.0 | 4 | 5 | <1 | 15 h 40 min |
| July | 90°F | 63°F | 76.3°F | 0.10 | 0.0 | 1 | 18 | <1 | 15 h 20 min |
| August | 89°F | 62°F | 75.5°F | 0.15 | 0.0 | 2 | 17 | <1 | 14 h 10 min |
| September | 80°F | 53°F | 66.5°F | 0.33 | 0.0 | 3 | 4 | <1 | 12 h 40 min |
| October | 66°F | 42°F | 53.7°F | 0.81 | 0.1 | 7 | <1 | 3 | 11 h |
| November | 50°F | 34°F | 42.4°F | 1.13 | 0.4 | 10 | <1 | 11 | 9 h 30 min |
| December | 41°F | 30°F | 35.5°F | 1.66 | 1.4 | 11 | <1 | 17 | 8 h 40 min |
| Year (annual) | 65°F | 44°F | 54.4°F | 9.30 | 5.3 | 77 | 46 | 73 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 5°C | −1°C | 1.8°C | 37 mm | 5 cm |
| February | 8°C | −1°C | 3.7°C | 25 mm | 3 cm |
| March | 13°C | 2°C | 7.6°C | 21 mm | 1 cm |
| April | 18°C | 6°C | 11.6°C | 15 mm | 0 cm |
| May | 23°C | 10°C | 16.5°C | 19 mm | 0 cm |
| June | 27°C | 14°C | 20.1°C | 12 mm | 0 cm |
| July | 32°C | 17°C | 24.6°C | 3 mm | 0 cm |
| August | 32°C | 17°C | 24.2°C | 4 mm | 0 cm |
| September | 27°C | 12°C | 19.2°C | 8 mm | 0 cm |
| October | 19°C | 6°C | 12.1°C | 21 mm | 0 cm |
| November | 10°C | 1°C | 5.8°C | 29 mm | 1 cm |
| December | 5°C | −1°C | 1.9°C | 42 mm | 4 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00350265; 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 Arlington?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September has the fewest days with rain (3).
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 USC00350265.
When is the last frost in Arlington?
In Arlington, the last spring frost (32°F) comes after April 6 in half of years and after April 28 in one year in ten; the first autumn frost comes before October 21 in half of years and before October 6 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 61 year in 10 after April 28; 9 in 10 after March 22
- First autumn frost, half of years before
- October 211 year in 10 before October 6; 9 in 10 before November 7
NOAA puts the median frost-free season at 196 days, and the season without a hard freeze (28°F) at 230 days.
A hard freeze (28°F) comes after March 19 in half of springs and before November 3 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Arlington in zone 7b in ZIP code 97812, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Arlington's NOAA station is in zone 7b: the coldest night of a typical year reaches 6°F (17 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 USC00350265; 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 Arlington?
In a normal year in Arlington, 46 days a year reach 90°F (9 of them 100°F or more), 73 nights fall to 32°F or colder and 77 days bring measurable precipitation.
- Days at 90°F or more
- 46a normal year
- Days at 100°F or more
- 9a normal year
- Nights at 32°F or colder
- 73a normal year
- Days that stay below freezing
- 9high of 32°F or less
- Days with 0.01 inch of precipitation
- 77a normal year
- Days with 1 inch of snow or more
- 3a normal year
The highest temperature in this station's record (since 1893) is 117°F, on June 30, 2021; the lowest is −22°F, on January 27, 1957.
The wettest calendar year on that record is 2010, with 14.27 in; the snowiest season is 1968–69, with 32.8 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00350265; records: ACIS (NOAA Regional Climate Centers), station USC00350265. Records use complete months only; a month missing more than three days is left out.
How sunny is Arlington?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Arlington, 4.2 kWh per square metre a day. July is the sunniest month (93%) and December the cloudiest (56%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 57% | 1.3 |
| February | 66% | 2.3 |
| March | 68% | 3.5 |
| April | 75% | 5.1 |
| May | 78% | 6.3 |
| June | 83% | 7.1 |
| July | 93% | 7.7 |
| August | 91% | 6.5 |
| September | 86% | 4.8 |
| October | 76% | 3.0 |
| November | 64% | 1.6 |
| December | 56% | 1.1 |
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 Arlington need?
A normal year in Arlington brings 4,820 heating degree days, 10% fewer than the median U.S. place (5,373), and 970 cooling degree days, 7% more 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 3,323 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 922 | 0 |
| February | 735 | 0 |
| March | 600 | 0 |
| April | 367 | 2 |
| May | 149 | 45 |
| June | 37 | 132 |
| July | 3 | 354 |
| August | 3 | 327 |
| September | 58 | 104 |
| October | 354 | 5 |
| November | 678 | 0 |
| December | 914 | 0 |
| Year (annual) | 4,820 | 970 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00350265. 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 Arlington been warmer than normal lately?
2025 averaged 55.8°F, 1.4°F above the 1991-2020 normal of 54.4°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 56.3°F | +1.9°F | 6.94 | – |
| 2022 | 53.6°F | −0.8°F | 11.60 | 4.0 |
| 2023 | 54.9°F | +0.5°F | 7.24 | 1.5 |
| 2024 | 54.6°F | +0.2°F | 11.28 | 6.5 |
| 2025 | 55.8°F | +1.4°F | 11.06 | – |
Over 62 complete years from 1893 to 2025, the station's annual mean temperature rose at a fitted 1.8°F per century (+0.10°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00350265; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Arlington's climate compare?
Arlington is warmer than 91 of the other 104 places with their own NOAA record in Oregon, and wetter than 4. Across the 7,247 U.S. stations with normals, its annual mean of 54.4°F is warmer than 58%.
In the Köppen classification computed from these normals, Arlington is BSk: cold semi-arid steppe. 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 Arlington share this climate record?
Roosevelt has no NOAA station with 1991-2020 normals of its 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.
- Roosevelt, WA164 people · 2 mi NW
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 Arlington's climate
What is the coldest month in Arlington?
January, with a normal high of 41°F and a normal low of 30°F. The warmest is July (90°F by day, 63°F at night).
Does it snow in Arlington?
Yes: 5 inches in a normal year, falling on 5 days with 0.1 inch or more, the most in January (2.0 inches).
What is the rainiest month in Arlington?
December, with 1.66 in of precipitation in a normal year; the driest is July with 0.10 in.
What plant hardiness zone is Arlington in?
The USDA's 2023 map puts Arlington in zone 7b in ZIP code 97812, the nearest ZIP area. By the same method at Arlington's NOAA station, the coldest night of a typical year reaches 6°F (17 years, 1991-2020): zone 7b.
How late can frost come in Arlington?
In half of years the last 32°F night comes after April 6; in one year in ten it comes after April 28. Waiting until April 28 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Bickleton, WA20 miles from this station, 46.4°F a year
- Boardman, OR26 miles from this station, 54.0°F a year
- Satus Pass (2 mi SSW), WA27 miles from this station, 46.8°F a year
- Moro, OR30 miles from this station, 49.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made