Oregon City, Oregon climate: Normal weather by month, frost dates and records
Oregon City's normal year runs from 36°F December nights to 84°F August afternoons, with 44.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.0°C, December lows of 2°C, August highs of 29°C, 1,138 mm of precipitation a year.
- NOAA stationOregon City
- Station IDUSC00356334
- Location45.36°N 122.60°W
- Elevation167 ft (51 m)
- Population38,327
On October 23, the normal high in Oregon City is 62°F and the normal low 45°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Oregon City.
- Jan 48° 37°
- Feb 53° 38°
- Mar 58° 40°
- Apr 64° 43°
- May 71° 48°
- Jun 76° 53°
- Jul 84° 57°
- Aug 84° 58°
- Sep 78° 53°
- Oct 65° 47°
- Nov 53° 41°
- Dec 47° 36°
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 Oregon City each month?
August is the warmest month, with normal highs of 84°F; December the coldest, with normal lows of 36°F. The most precipitation falls in December (7.20 in), the least in July (0.50 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 48°F | 37°F | 42.5°F | 6.54 | – | <1 | 8 | 9 h 10 min |
| February | 53°F | 38°F | 45.0°F | 4.46 | – | <1 | 6 | 10 h 20 min |
| March | 58°F | 40°F | 48.9°F | 4.78 | – | <1 | 3 | 11 h 50 min |
| April | 64°F | 43°F | 53.4°F | 3.84 | – | <1 | 1 | 13 h 30 min |
| May | 71°F | 48°F | 59.7°F | 2.54 | – | 1 | <1 | 14 h 50 min |
| June | 76°F | 53°F | 64.6°F | 1.79 | – | 3 | <1 | 15 h 40 min |
| July | 84°F | 57°F | 70.5°F | 0.50 | – | 7 | <1 | 15 h 20 min |
| August | 84°F | 58°F | 70.8°F | 0.56 | – | 7 | <1 | 14 h 10 min |
| September | 78°F | 53°F | 65.4°F | 1.64 | – | 3 | <1 | 12 h 40 min |
| October | 65°F | 47°F | 55.7°F | 4.23 | – | <1 | 1 | 11 h |
| November | 53°F | 41°F | 47.0°F | 6.73 | – | <1 | 4 | 9 h 30 min |
| December | 47°F | 36°F | 41.8°F | 7.20 | – | <1 | 8 | 8 h 50 min |
| Year (annual) | 65°F | 46°F | 55.4°F | 44.81 | – | 20 | 30 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 9°C | 3°C | 5.8°C | 166 mm |
| February | 11°C | 3°C | 7.2°C | 113 mm |
| March | 14°C | 4°C | 9.4°C | 121 mm |
| April | 18°C | 6°C | 11.9°C | 98 mm |
| May | 22°C | 9°C | 15.4°C | 65 mm |
| June | 25°C | 12°C | 18.1°C | 45 mm |
| July | 29°C | 14°C | 21.4°C | 13 mm |
| August | 29°C | 14°C | 21.6°C | 14 mm |
| September | 26°C | 12°C | 18.6°C | 42 mm |
| October | 18°C | 8°C | 13.2°C | 107 mm |
| November | 12°C | 5°C | 8.3°C | 171 mm |
| December | 8°C | 2°C | 5.4°C | 183 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Portland Kgw-Tv (12 miles away), gets 4 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00356334; 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 Oregon City?
Normal highs sit between 65°F and 85°F in May, June, July, August and September.
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 USC00356334.
When is the last frost in Oregon City?
In Oregon City, the last spring frost (32°F) comes after March 18 in half of years and after April 11 in one year in ten; the first autumn frost comes before November 18 in half of years and before October 30 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
- March 181 year in 10 after April 11; 9 in 10 after February 19
- First autumn frost, half of years before
- November 181 year in 10 before October 30; 9 in 10 before December 12
NOAA puts the median frost-free season at 244 days, and the season without a hard freeze (28°F) at 302 days.
A hard freeze (28°F) comes after February 12 in half of springs and before December 8 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Oregon City in zone 9a in ZIP code 97045.
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00356334; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Oregon City?
In a normal year in Oregon City, 20 days a year reach 90°F (2 of them 100°F or more) and 30 nights fall to 32°F or colder.
- Days at 90°F or more
- 20a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 30a normal year
- Days that stay below freezing
- 1high of 32°F or less
The highest temperature in this station's record (since 1948) is 108°F, on July 29, 2009; the lowest is −2°F, on January 31, 1950.
The wettest calendar year on that record is 1950, with 65.55 in; the snowiest season is 1949–50, with 34.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00356334; records: ACIS (NOAA Regional Climate Centers), station USC00356334. Records use complete months only; a month missing more than three days is left out.
How sunny is Oregon City?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Oregon City, 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 Oregon City need?
A normal year in Oregon City brings 4,015 heating degree days, 25% fewer than the median U.S. place (5,373), and 543 cooling degree days, 40% fewer than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,908 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 698 | 0 |
| February | 560 | 0 |
| March | 499 | 0 |
| April | 352 | 4 |
| May | 191 | 25 |
| June | 76 | 63 |
| July | 12 | 181 |
| August | 9 | 189 |
| September | 65 | 77 |
| October | 294 | 5 |
| November | 542 | 0 |
| December | 719 | 0 |
| Year (annual) | 4,015 | 543 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00356334. 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 Oregon City been warmer than normal lately?
Over 46 complete years from 1949 to 2017, the station's annual mean temperature rose at a fitted 3.4°F per century (+0.19°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Oregon City's climate compare?
Oregon City is warmer than 98 of the other 104 places with their own NOAA record in Oregon, and wetter than 59. Across the 7,247 U.S. stations with normals, its annual mean of 55.4°F is warmer than 62%.
In the Köppen classification computed from these normals, Oregon City 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 Oregon City share this climate record?
8 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.
- West Linn, OR26,597 people · 2 mi NW
- Oak Grove, OR17,408 people · 4 mi N
- Oatfield, OR12,709 people · 4 mi N
- Gladstone, OR11,898 people · 2 mi N
- Jennings Lodge, OR7,732 people · 3 mi N
- Beavercreek, OR4,577 people · 7 mi SE
- Stafford, OR1,572 people · 4 mi NW
- Johnson City, OR553 people · 4 mi N
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 Oregon City's climate
What is the coldest month in Oregon City?
December, with a normal high of 47°F and a normal low of 36°F. The warmest is August (84°F by day, 58°F at night).
Does it snow in Oregon City?
Yes. NOAA publishes no 1991-2020 snowfall normal for Oregon City's NOAA station; the nearest record that keeps one, Portland Kgw-Tv (12 miles away), records 4 inches of snow in a normal year.
What is the rainiest month in Oregon City?
December, with 7.20 in of precipitation in a normal year; the driest is July with 0.50 in.
What plant hardiness zone is Oregon City in?
The USDA's 2023 map puts Oregon City in zone 9a in ZIP code 97045.
How late can frost come in Oregon City?
In half of years the last 32°F night comes after March 18; in one year in ten it comes after April 11. Waiting until April 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon City in OctoberThis month day by day, its records and recent years
- Oregon climateThe statewide normals and every place in the state
- North Willamette Experiment Station, OR9 miles from this station, 53.9°F a year
- Aurora, OR11 miles from this station, 54.8°F a year
- Beaverton, OR12 miles from this station, 53.7°F a year
- Molalla, OR13 miles from this station, 53.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made