Grants Pass, Oregon climate: Normal weather by month, frost dates and records
Grants Pass's normal year runs from 35°F December nights to 91°F July afternoons, with 31.3 inches of precipitation and less than an inch of snow (0.9 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.1°C, December lows of 2°C, July highs of 33°C, 795 mm of precipitation a year.
- NOAA stationGrants Pass
- Station IDUSC00353445
- Location42.42°N 123.32°W
- Elevation932 ft (284 m)
- Population39,468
On October 23, the normal high in Grants Pass is 66°F and the normal low 40°F, and the chance of measurable rain or snow is 31%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Grants Pass.
- Jan 48° 35°
- Feb 54° 36°
- Mar 60° 37°
- Apr 65° 40°
- May 74° 46°
- Jun 81° 51°
- Jul 91° 56°
- Aug 91° 55°
- Sep 84° 48°
- Oct 70° 41°
- Nov 54° 39°
- Dec 46° 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 in Grants Pass each month?
July is the warmest month, with normal highs of 91°F; December the coldest, with normal lows of 35°F. The most precipitation falls in December (6.55 in), the least in August (0.26 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 | 35°F | 41.5°F | 5.08 | 17 | <1 | 13 | 9 h 20 min |
| February | 54°F | 36°F | 44.8°F | 3.97 | 14 | <1 | 12 | 10 h 30 min |
| March | 60°F | 37°F | 48.2°F | 3.65 | 16 | <1 | 10 | 11 h 50 min |
| April | 65°F | 40°F | 52.6°F | 2.31 | 13 | <1 | 4 | 13 h 20 min |
| May | 74°F | 46°F | 59.9°F | 1.39 | 9 | 3 | 1 | 14 h 30 min |
| June | 81°F | 51°F | 65.9°F | 0.68 | 5 | 6 | <1 | 15 h 20 min |
| July | 91°F | 56°F | 73.4°F | 0.37 | 2 | 17 | <1 | 15 h |
| August | 91°F | 55°F | 72.7°F | 0.26 | 2 | 18 | <1 | 14 h |
| September | 84°F | 48°F | 66.1°F | 0.56 | 3 | 9 | 1 | 12 h 30 min |
| October | 70°F | 41°F | 55.5°F | 2.07 | 8 | 1 | 5 | 11 h 10 min |
| November | 54°F | 39°F | 46.1°F | 4.42 | 16 | <1 | 7 | 9 h 50 min |
| December | 46°F | 35°F | 40.4°F | 6.55 | 17 | <1 | 13 | 9 h 10 min |
| Year (annual) | 68°F | 43°F | 55.6°F | 31.31 | 121 | 55 | 65 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 9°C | 2°C | 5.3°C | 129 mm |
| February | 12°C | 2°C | 7.1°C | 101 mm |
| March | 15°C | 3°C | 9.0°C | 93 mm |
| April | 19°C | 4°C | 11.4°C | 59 mm |
| May | 23°C | 8°C | 15.5°C | 35 mm |
| June | 27°C | 10°C | 18.8°C | 17 mm |
| July | 33°C | 13°C | 23.0°C | 9 mm |
| August | 33°C | 13°C | 22.6°C | 7 mm |
| September | 29°C | 9°C | 18.9°C | 14 mm |
| October | 21°C | 5°C | 13.1°C | 53 mm |
| November | 12°C | 4°C | 7.8°C | 112 mm |
| December | 8°C | 2°C | 4.7°C | 166 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00353445; 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 Grants Pass?
Normal highs sit between 65°F and 85°F in April, 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 USC00353445.
When is the last frost in Grants Pass?
In Grants Pass, the last spring frost (32°F) comes after April 8 in half of years and after May 1 in one year in ten; the first autumn frost comes before October 28 in half of years and before October 8 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 81 year in 10 after May 1; 9 in 10 after March 15
- First autumn frost, half of years before
- October 281 year in 10 before October 8; 9 in 10 before November 24
NOAA puts the median frost-free season at 201 days, and the season without a hard freeze (28°F) at 255 days.
A hard freeze (28°F) comes after March 8 in half of springs and before November 16 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Grants Pass in zone 8b in ZIP code 97527, the nearest ZIP area.
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00353445; 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 Grants Pass?
In a normal year in Grants Pass, 55 days a year reach 90°F (9 of them 100°F or more), 65 nights fall to 32°F or colder and 121 days bring measurable precipitation.
- Days at 90°F or more
- 55a normal year
- Days at 100°F or more
- 9a normal year
- Nights at 32°F or colder
- 65a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 121a normal year
The highest temperature in this station's record (since 1893) is 114°F, on July 23, 1928; the lowest is −1°F, on December 10, 1972.
The wettest calendar year on that record is 2016, with 47.17 in; the snowiest season is 1929–30, with 27.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00353445; records: ACIS (NOAA Regional Climate Centers), station USC00353445. Records use complete months only; a month missing more than three days is left out.
How sunny is Grants Pass?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Grants Pass, 4.5 kWh per square metre a day. July is the sunniest month (94%) and December the cloudiest (58%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 63% | 1.7 |
| February | 66% | 2.6 |
| March | 66% | 3.6 |
| April | 71% | 5.0 |
| May | 78% | 6.4 |
| June | 84% | 7.4 |
| July | 94% | 7.9 |
| August | 93% | 6.8 |
| September | 88% | 5.2 |
| October | 79% | 3.4 |
| November | 65% | 1.9 |
| December | 58% | 1.4 |
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 Grants Pass need?
A normal year in Grants Pass brings 4,176 heating degree days, 22% fewer than the median U.S. place (5,373), and 765 cooling degree days, 16% 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 3,106 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 730 | 0 |
| February | 567 | 0 |
| March | 519 | 0 |
| April | 375 | 3 |
| May | 195 | 36 |
| June | 75 | 101 |
| July | 9 | 269 |
| August | 9 | 250 |
| September | 67 | 100 |
| October | 302 | 6 |
| November | 566 | 0 |
| December | 763 | 0 |
| Year (annual) | 4,176 | 765 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00353445. 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 Grants Pass been warmer than normal lately?
2024 averaged 57.6°F, 2.0°F above the 1991-2020 normal of 55.6°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.9°F | +1.3°F | 27.34 |
| 2022 | 56.3°F | +0.6°F | 22.67 |
| 2023 | 56.1°F | +0.5°F | 28.28 |
| 2024 | 57.6°F | +2.0°F | 40.19 |
Over 89 complete years from 1892 to 2024, the station's annual mean temperature rose at a fitted 2.6°F per century (+0.14°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00353445; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Grants Pass's climate compare?
Grants Pass is warmer than 100 of the other 104 places with their own NOAA record in Oregon, and wetter than 46. Across the 7,247 U.S. stations with normals, its annual mean of 55.6°F is warmer than 62%.
In the Köppen classification computed from these normals, Grants Pass is Csa: temperate, dry-summer, hot 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 Grants Pass 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.
- Redwood, OR3,150 people · 4 mi W
- Rogue River, OR2,337 people · 8 mi E
- New Hope, OR1,529 people · 4 mi SW
- Foots Creek, OR1,095 people · 10 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 Grants Pass's climate
What is the coldest month in Grants Pass?
December, with a normal high of 46°F and a normal low of 35°F. The warmest is July (91°F by day, 56°F at night).
Does it snow in Grants Pass?
Rarely: NOAA's normal is 0.9 inch a year.
What is the rainiest month in Grants Pass?
December, with 6.55 in of precipitation in a normal year; the driest is August with 0.26 in.
What plant hardiness zone is Grants Pass in?
The USDA's 2023 map puts Grants Pass in zone 8b in ZIP code 97527, the nearest ZIP area.
How late can frost come in Grants Pass?
In half of years the last 32°F night comes after April 8; 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
- Grants Pass in OctoberThis month day by day, its records and recent years
- Oregon climateThe statewide normals and every place in the state
- Sexton Summit, OR12 miles from this station, 48.9°F a year
- Ruch, OR20 miles from this station, 54.2°F a year
- Medford, OR23 miles from this station, 55.9°F a year
- Cave Junction, OR24 miles from this station, 54.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made