Winchester, Oregon climate: Climate normals at a NOAA weather station
Winchester's normal year runs from 35°F December nights to 86°F July afternoons, with 36.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.7°C, December lows of 2°C, July highs of 30°C, 919 mm of precipitation a year.
- NOAA stationWinchester
- Station IDUSC00359461
- Location43.28°N 123.35°W
- Elevation460 ft (140 m)
On October 23, the normal high in Winchester is 65°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 Winchester.
- Jan 50° 35°
- Feb 54° 35°
- Mar 59° 37°
- Apr 64° 40°
- May 71° 45°
- Jun 77° 50°
- Jul 86° 55°
- Aug 86° 54°
- Sep 81° 49°
- Oct 68° 43°
- Nov 56° 38°
- Dec 49° 35°
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 Winchester each month?
July is the warmest month, with normal highs of 86°F; December the coldest, with normal lows of 35°F. The most precipitation falls in December (6.81 in), the least in July (0.29 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 50°F | 35°F | 42.4°F | 5.41 | 20 | <1 | 10 | 9 h 20 min |
| February | 54°F | 35°F | 44.7°F | 4.09 | 17 | <1 | 8 | 10 h 30 min |
| March | 59°F | 37°F | 48.0°F | 4.01 | 18 | <1 | 5 | 11 h 50 min |
| April | 64°F | 40°F | 51.9°F | 3.24 | 16 | <1 | 1 | 13 h 20 min |
| May | 71°F | 45°F | 58.3°F | 2.16 | 12 | 1 | <1 | 14 h 40 min |
| June | 77°F | 50°F | 63.7°F | 1.11 | 6 | 2 | <1 | 15 h 20 min |
| July | 86°F | 55°F | 70.4°F | 0.29 | 2 | 9 | <1 | 15 h 10 min |
| August | 86°F | 54°F | 70.2°F | 0.30 | 2 | 9 | <1 | 14 h |
| September | 81°F | 49°F | 64.7°F | 0.94 | 5 | 4 | <1 | 12 h 30 min |
| October | 68°F | 43°F | 55.3°F | 2.55 | 11 | <1 | 1 | 11 h 10 min |
| November | 56°F | 38°F | 47.0°F | 5.26 | 20 | <1 | 4 | 9 h 40 min |
| December | 49°F | 35°F | 41.9°F | 6.81 | 20 | <1 | 9 | 9 h |
| Year (annual) | 67°F | 43°F | 54.9°F | 36.17 | 150 | 25 | 38 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 10°C | 2°C | 5.8°C | 137 mm |
| February | 12°C | 2°C | 7.1°C | 104 mm |
| March | 15°C | 3°C | 8.9°C | 102 mm |
| April | 18°C | 4°C | 11.1°C | 82 mm |
| May | 22°C | 7°C | 14.6°C | 55 mm |
| June | 25°C | 10°C | 17.6°C | 28 mm |
| July | 30°C | 13°C | 21.3°C | 7 mm |
| August | 30°C | 12°C | 21.2°C | 8 mm |
| September | 27°C | 9°C | 18.2°C | 24 mm |
| October | 20°C | 6°C | 12.9°C | 65 mm |
| November | 13°C | 4°C | 8.3°C | 134 mm |
| December | 9°C | 2°C | 5.5°C | 173 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Roseburg Kqen (5 miles away), gets 0 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00359461; 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 Winchester?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September has the fewest days with rain (5).
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 USC00359461.
When is the last frost at Winchester?
In Winchester, the last spring frost (32°F) comes after March 31 in half of years and after April 26 in one year in ten; the first autumn frost comes before November 5 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
- March 311 year in 10 after April 26; 9 in 10 after March 5
- First autumn frost, half of years before
- November 51 year in 10 before October 16; 9 in 10 before December 3
NOAA puts the median frost-free season at 215 days, and the season without a hard freeze (28°F) at 278 days.
A hard freeze (28°F) comes after February 26 in half of springs and before December 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Winchester in zone 8b in ZIP code 97495, 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 9a: the coldest night of a typical year reaches 22°F (27 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00359461; 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 Winchester?
In a normal year in Winchester, 25 days a year reach 90°F (2 of them 100°F or more), 38 nights fall to 32°F or colder and 150 days bring measurable precipitation.
- Days at 90°F or more
- 25a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 38a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 150a normal year
The highest temperature in this station's record (since 1989) is 112°F, on June 28, 2021; the lowest is 7°F, on December 23, 1990.
The wettest calendar year on that record is 1996, with 61.76 in; the snowiest season is 1968–69, with 31.8 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00359461; records: ACIS (NOAA Regional Climate Centers), station USC00359461. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Winchester?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds at Winchester, 4.0 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (55%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 59% | 1.5 |
| February | 62% | 2.3 |
| March | 63% | 3.4 |
| April | 67% | 4.7 |
| May | 72% | 5.9 |
| June | 76% | 6.6 |
| July | 88% | 7.3 |
| August | 88% | 6.3 |
| September | 83% | 4.8 |
| October | 72% | 3.0 |
| November | 60% | 1.6 |
| December | 55% | 1.2 |
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 Winchester record?
A normal year at Winchester brings 4,168 heating degree days, 22% fewer than the median U.S. place (5,373), and 488 cooling degree days, 46% 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 2,741 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 702 | 0 |
| February | 568 | 0 |
| March | 527 | 0 |
| April | 394 | 1 |
| May | 224 | 17 |
| June | 93 | 54 |
| July | 11 | 178 |
| August | 10 | 170 |
| September | 74 | 63 |
| October | 305 | 5 |
| November | 542 | 0 |
| December | 718 | 0 |
| Year (annual) | 4,168 | 488 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00359461. 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 Winchester been warmer than normal?
2025 averaged 56.3°F, 1.4°F above the 1991-2020 normal of 54.9°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.3°F | +1.4°F | 28.98 |
| 2022 | 55.1°F | +0.2°F | 31.57 |
| 2023 | 55.1°F | +0.2°F | 31.16 |
| 2024 | 56.4°F | +1.5°F | 43.99 |
| 2025 | 56.3°F | +1.4°F | 30.51 |
Source: observed years: ACIS, station USC00359461. A year counts only with all twelve months complete.
How does Winchester's climate compare?
Winchester is warmer than 94 of the 105 places with their own NOAA record in Oregon, and wetter than 50. Across the 7,247 U.S. stations with normals, its annual mean of 54.9°F is warmer than 60%.
In the Köppen classification computed from these normals, Winchester 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 Winchester 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.
- Sutherlin, OR8,643 people · 7 mi N
- Roseburg North, OR4,400 people · 1 mi S
- Oakland, OR948 people · 10 mi N
- Fair Oaks, OR247 people · 11 mi NE
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 Winchester's climate
What is the coldest month at Winchester?
December, with a normal high of 49°F and a normal low of 35°F. The warmest is July (86°F by day, 55°F at night).
Does it snow at Winchester?
Rarely. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Roseburg Kqen (5 miles away), records 0 inches of snow in a normal year.
What is the rainiest month at Winchester?
December, with 6.81 in of precipitation in a normal year; the driest is July with 0.29 in.
What plant hardiness zone is Winchester in?
The USDA's 2023 map puts Winchester in zone 8b in ZIP code 97495, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 22°F (27 years, 1991-2020): zone 9a.
How late can frost come at Winchester?
In half of years the last 32°F night comes after March 31; in one year in ten it comes after April 26. Waiting until April 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Roseburg, OR3 miles from this station, 55.9°F a year
- Idleyld Park (4 mi NE), OR21 miles from this station, 52.4°F a year
- Riddle, OR23 miles from this station, 56.7°F a year
- Drain, OR26 miles from this station, 54.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made