Dorena, Oregon climate: Climate normals at a NOAA weather station
Dorena's normal year runs from 34°F December nights to 81°F July afternoons, with 46.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.1°C, December lows of 1°C, July highs of 27°C, 1,182 mm of precipitation a year.
- NOAA stationDorena
- Station IDUSC00352374
- Location43.78°N 122.96°W
- Elevation820 ft (250 m)
On October 23, the normal high in Dorena is 61°F and the normal low 41°F, and the chance of measurable rain or snow is 43%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Dorena.
- Jan 48° 34°
- Feb 51° 34°
- Mar 56° 36°
- Apr 60° 39°
- May 67° 44°
- Jun 72° 48°
- Jul 81° 51°
- Aug 82° 50°
- Sep 76° 46°
- Oct 64° 42°
- Nov 53° 38°
- 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 at Dorena each month?
July is the warmest month, with normal highs of 81°F; December the coldest, with normal lows of 34°F. The most precipitation falls in December (7.16 in), the least in July (0.38 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 48°F | 34°F | 40.8°F | 6.20 | 20 | <1 | 13 | 9 h 20 min |
| February | 51°F | 34°F | 42.5°F | 4.67 | 16 | <1 | 13 | 10 h 30 min |
| March | 56°F | 36°F | 45.6°F | 5.56 | 18 | <1 | 9 | 11 h 50 min |
| April | 60°F | 39°F | 49.3°F | 4.45 | 17 | <1 | 4 | 13 h 20 min |
| May | 67°F | 44°F | 55.3°F | 3.45 | 12 | <1 | 1 | 14 h 40 min |
| June | 72°F | 48°F | 59.7°F | 2.07 | 6 | 1 | <1 | 15 h 30 min |
| July | 81°F | 51°F | 66.0°F | 0.38 | 2 | 6 | <1 | 15 h 10 min |
| August | 82°F | 50°F | 65.9°F | 0.55 | 3 | 6 | <1 | 14 h |
| September | 76°F | 46°F | 61.1°F | 1.76 | 4 | 2 | <1 | 12 h 30 min |
| October | 64°F | 42°F | 52.6°F | 3.84 | 12 | <1 | 2 | 11 h 10 min |
| November | 53°F | 38°F | 45.0°F | 6.46 | 18 | <1 | 7 | 9 h 40 min |
| December | 46°F | 34°F | 39.9°F | 7.16 | 20 | <1 | 14 | 9 h |
| Year (annual) | 63°F | 41°F | 52.0°F | 46.55 | 147 | 15 | 62 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 9°C | 1°C | 4.9°C | 157 mm |
| February | 11°C | 1°C | 5.8°C | 119 mm |
| March | 13°C | 2°C | 7.6°C | 141 mm |
| April | 15°C | 4°C | 9.6°C | 113 mm |
| May | 19°C | 7°C | 12.9°C | 88 mm |
| June | 22°C | 9°C | 15.4°C | 53 mm |
| July | 27°C | 11°C | 18.9°C | 10 mm |
| August | 28°C | 10°C | 18.8°C | 14 mm |
| September | 24°C | 8°C | 16.2°C | 45 mm |
| October | 18°C | 5°C | 11.4°C | 98 mm |
| November | 11°C | 3°C | 7.2°C | 164 mm |
| December | 8°C | 1°C | 4.4°C | 182 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Cottage Grove (3 miles away), gets 3 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00352374; 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.
Which months are mildest at Dorena?
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 (2).
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 USC00352374.
When is the last frost at Dorena?
In Dorena, the last spring frost (32°F) comes after April 16 in half of years and after May 11 in one year in ten; the first autumn frost comes before October 28 in half of years and before October 4 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 161 year in 10 after May 11; 9 in 10 after March 24
- First autumn frost, half of years before
- October 281 year in 10 before October 4; 9 in 10 before November 23
NOAA puts the median frost-free season at 194 days, and the season without a hard freeze (28°F) at 252 days.
A hard freeze (28°F) comes after March 12 in half of springs and before November 21 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Dorena in zone 8b in ZIP code 97424, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 8b: the coldest night of a typical year reaches 18°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 USC00352374; 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 at Dorena?
In a normal year in Dorena, 15 days a year reach 90°F (1 of them 100°F or more), 62 nights fall to 32°F or colder and 147 days bring measurable precipitation.
- Days at 90°F or more
- 15a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 62a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 147a normal year
The highest temperature in this station's record (since 1950) is 106°F, on July 17, 1979; the lowest is −4°F, on December 9, 1972.
The wettest calendar year on that record is 1953, with 60.83 in; the snowiest season is 1968–69, with 50.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00352374; records: ACIS (NOAA Regional Climate Centers), station USC00352374. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Dorena?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds at Dorena, 4.2 kWh per square metre a day. July is the sunniest month (92%) and December the cloudiest (58%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 61% | 1.6 |
| February | 64% | 2.5 |
| March | 63% | 3.4 |
| April | 67% | 4.8 |
| May | 73% | 6.0 |
| June | 79% | 7.0 |
| July | 92% | 7.7 |
| August | 91% | 6.7 |
| September | 84% | 5.0 |
| October | 74% | 3.1 |
| November | 62% | 1.8 |
| December | 58% | 1.3 |
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 many heating and cooling degree days does Dorena record?
A normal year at Dorena brings 4,933 heating degree days, 8% fewer than the median U.S. place (5,373), and 200 cooling degree days, 78% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,028 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 749 | 0 |
| February | 630 | 0 |
| March | 601 | 0 |
| April | 471 | 0 |
| May | 308 | 5 |
| June | 177 | 18 |
| July | 46 | 79 |
| August | 46 | 74 |
| September | 141 | 22 |
| October | 385 | 1 |
| November | 600 | 0 |
| December | 778 | 0 |
| Year (annual) | 4,933 | 200 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00352374. 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.
Have recent years at Dorena been warmer than normal?
2022 averaged 52.0°F, equal to the 1991-2020 normal of 52.0°F. 1 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 52.8°F | +0.8°F | – |
| 2022 | 52.0°F | at normal | – |
Over 49 complete years from 1951 to 2023, the station's annual mean temperature rose at a fitted 2.9°F per century (+0.16°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00352374; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Dorena's climate compare?
Dorena is warmer than 53 of the 105 places with their own NOAA record in Oregon, and wetter than 63. Across the 7,247 U.S. stations with normals, its annual mean of 52.0°F is warmer than 49%.
In the Köppen classification computed from these normals, Dorena 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.
Questions about Dorena's climate
What is the coldest month at Dorena?
December, with a normal high of 46°F and a normal low of 34°F. The warmest is July (81°F by day, 51°F at night).
Does it snow at Dorena?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Cottage Grove (3 miles away), records 3 inches of snow in a normal year.
What is the rainiest month at Dorena?
December, with 7.16 in of precipitation in a normal year; the driest is July with 0.38 in.
What plant hardiness zone is Dorena in?
The USDA's 2023 map puts Dorena in zone 8b in ZIP code 97424, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 18°F (20 years, 1991-2020): zone 8b.
How late can frost come at Dorena?
In half of years the last 32°F night comes after April 16; in one year in ten it comes after May 11. Waiting until May 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Cottage Grove, OR3 miles from this station, 52.3°F a year
- Lookout Point Dam, OR14 miles from this station, 53.4°F a year
- Drain, OR20 miles from this station, 54.1°F a year
- Leaburg (1 mi SW), OR26 miles from this station, 53.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made