Silverton, Oregon climate: Normal weather by month, frost dates and records
Silverton's normal year runs from 35°F December nights to 80°F August afternoons, with 47.2 inches of precipitation and 1 inch of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.7°C, December lows of 2°C, August highs of 27°C, 1,199 mm of precipitation a year.
- NOAA stationSilverton
- Station IDUSC00357823
- Location45.01°N 122.77°W
- Elevation408 ft (124 m)
- Population10,391
On October 23, the normal high in Silverton is 59°F and the normal low 43°F, and the chance of measurable rain or snow is 56%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Silverton.
- Jan 47° 35°
- Feb 50° 36°
- Mar 55° 38°
- Apr 60° 42°
- May 67° 47°
- Jun 72° 51°
- Jul 80° 56°
- Aug 80° 56°
- Sep 74° 52°
- Oct 63° 45°
- Nov 52° 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 Silverton each month?
August is the warmest month, with normal highs of 80°F; December the coldest, with normal lows of 35°F. The most precipitation falls in December (7.46 in), the least in July (0.42 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 47°F | 35°F | 40.8°F | 6.70 | 0.1 | 22 | <1 | 12 | 9 h 10 min |
| February | 50°F | 36°F | 43.0°F | 4.94 | 0.8 | 19 | <1 | 9 | 10 h 20 min |
| March | 55°F | 38°F | 46.5°F | 5.45 | 0.0 | 21 | <1 | 4 | 11 h 50 min |
| April | 60°F | 42°F | 50.5°F | 4.15 | 0.0 | 19 | <1 | 1 | 13 h 30 min |
| May | 67°F | 47°F | 56.7°F | 2.88 | 0.0 | 14 | <1 | <1 | 14 h 50 min |
| June | 72°F | 51°F | 61.5°F | 1.84 | 0.0 | 10 | 1 | <1 | 15 h 40 min |
| July | 80°F | 56°F | 67.6°F | 0.42 | 0.0 | 3 | 4 | <1 | 15 h 20 min |
| August | 80°F | 56°F | 67.8°F | 0.53 | 0.0 | 4 | 3 | <1 | 14 h 10 min |
| September | 74°F | 52°F | 63.0°F | 1.66 | 0.0 | 7 | 1 | <1 | 12 h 40 min |
| October | 63°F | 45°F | 53.7°F | 4.19 | 0.0 | 15 | <1 | 1 | 11 h |
| November | 52°F | 39°F | 45.4°F | 6.98 | 0.0 | 23 | <1 | 6 | 9 h 40 min |
| December | 46°F | 35°F | 40.1°F | 7.46 | 0.2 | 23 | <1 | 12 | 8 h 50 min |
| Year (annual) | 62°F | 44°F | 53.0°F | 47.20 | 1.1 | 179 | 9 | 44 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 8°C | 2°C | 4.9°C | 170 mm | 0 cm |
| February | 10°C | 2°C | 6.1°C | 125 mm | 2 cm |
| March | 13°C | 3°C | 8.1°C | 138 mm | 0 cm |
| April | 15°C | 5°C | 10.3°C | 105 mm | 0 cm |
| May | 19°C | 8°C | 13.7°C | 73 mm | 0 cm |
| June | 22°C | 11°C | 16.4°C | 47 mm | 0 cm |
| July | 27°C | 13°C | 19.8°C | 11 mm | 0 cm |
| August | 27°C | 13°C | 19.9°C | 13 mm | 0 cm |
| September | 24°C | 11°C | 17.2°C | 42 mm | 0 cm |
| October | 17°C | 7°C | 12.1°C | 106 mm | 0 cm |
| November | 11°C | 4°C | 7.4°C | 177 mm | 0 cm |
| December | 8°C | 2°C | 4.5°C | 189 mm | 1 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00357823; 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 Silverton?
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 (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 USC00357823.
When is the last frost in Silverton?
In Silverton, the last spring frost (32°F) comes after March 28 in half of years and after April 19 in one year in ten; the first autumn frost comes before November 10 in half of years and before October 25 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 281 year in 10 after April 19; 9 in 10 after March 1
- First autumn frost, half of years before
- November 101 year in 10 before October 25; 9 in 10 before December 1
NOAA puts the median frost-free season at 227 days, and the season without a hard freeze (28°F) at 278 days.
A hard freeze (28°F) comes after February 25 in half of springs and before November 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Silverton in zone 8b in ZIP code 97373, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Silverton's NOAA station is in zone 8b: the coldest night of a typical year reaches 19°F (27 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 USC00357823; 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 Silverton?
In a normal year in Silverton, 9 days a year reach 90°F, 44 nights fall to 32°F or colder and 179 days bring measurable precipitation.
- Days at 90°F or more
- 9a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 44a normal year
- Days that stay below freezing
- 2high of 32°F or less
- Days with 0.01 inch of precipitation
- 179a normal year
- Days with 1 inch of snow or more
- fewer than 1a normal year
The highest temperature in this station's record (since 1962) is 113°F, on June 28, 2021; the lowest is 0°F, on December 9, 1972.
The wettest calendar year on that record is 1996, with 77.21 in; the snowiest season is 1968–69, with 22.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00357823; records: ACIS (NOAA Regional Climate Centers), station USC00357823. Records use complete months only; a month missing more than three days is left out.
How sunny is Silverton?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Silverton, 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 Silverton need?
A normal year in Silverton brings 4,658 heating degree days, 13% fewer than the median U.S. place (5,373), and 319 cooling degree days, 65% 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 2,332 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 750 | 0 |
| February | 616 | 0 |
| March | 574 | 0 |
| April | 436 | 1 |
| May | 267 | 11 |
| June | 138 | 33 |
| July | 32 | 112 |
| August | 28 | 114 |
| September | 104 | 44 |
| October | 354 | 2 |
| November | 588 | 0 |
| December | 772 | 0 |
| Year (annual) | 4,658 | 319 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00357823. 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 Silverton been warmer than normal lately?
2024 averaged 54.1°F, 1.1°F above the 1991-2020 normal of 53.0°F. 2 of the 2 complete years since 2023 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2023 | 53.6°F | +0.6°F | 41.50 | 0.0 |
| 2024 | 54.1°F | +1.1°F | 49.07 | – |
Over 51 complete years from 1963 to 2024, the station's annual mean temperature rose at a fitted 3.1°F per century (+0.17°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00357823; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Silverton's climate compare?
Silverton is warmer than 68 of the other 104 places with their own NOAA record in Oregon, and wetter than 64. Across the 7,247 U.S. stations with normals, its annual mean of 53.0°F is warmer than 54%.
In the Köppen classification computed from these normals, Silverton 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 Silverton share this climate record?
3 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.
- Mount Angel, OR3,436 people · 5 mi N
- Gervais, OR2,571 people · 9 mi NW
- Brooks, OR501 people · 10 mi W
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 Silverton's climate
What is the coldest month in Silverton?
December, with a normal high of 46°F and a normal low of 35°F. The warmest is August (80°F by day, 56°F at night).
Does it snow in Silverton?
Yes: 1 inch in a normal year, falling on 1 days with 0.1 inch or more, the most in February (0.8 inches).
What is the rainiest month in Silverton?
December, with 7.46 in of precipitation in a normal year; the driest is July with 0.42 in.
What plant hardiness zone is Silverton in?
The USDA's 2023 map puts Silverton in zone 8b in ZIP code 97373, the nearest ZIP area. By the same method at Silverton's NOAA station, the coldest night of a typical year reaches 19°F (27 years, 1991-2020): zone 8b.
How late can frost come in Silverton?
In half of years the last 32°F night comes after March 28; in one year in ten it comes after April 19. Waiting until April 19 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Silver Creek Falls, OR11 miles from this station, 48.8°F a year
- Scotts Mills, OR13 miles from this station, 48.7°F a year
- Salem, OR13 miles from this station, 54.1°F a year
- Stayton, OR15 miles from this station, 52.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made