Snowden, Washington climate: Climate normals at a NOAA weather station
Snowden's normal year runs from 25°F December nights to 79°F August afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.1°C, December lows of −4°C, August highs of 26°C.
- NOAA stationSnowden
- Station IDUSC00457794
- Location45.82°N 121.35°W
- Elevation2,415 ft (736 m)
On October 23, the normal high in Snowden is 54°F and the normal low 35°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Snowden.
- Jan 38° 26°
- Feb 42° 26°
- Mar 48° 30°
- Apr 55° 35°
- May 63° 40°
- Jun 68° 44°
- Jul 79° 49°
- Aug 79° 49°
- Sep 72° 45°
- Oct 58° 37°
- Nov 45° 31°
- Dec 36° 25°
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 Snowden each month?
August is the warmest month, with normal highs of 79°F; December the coldest, with normal lows of 25°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 38°F | 26°F | 31.7°F | – | <1 | 26 | 9 h |
| February | 42°F | 26°F | 34.0°F | – | <1 | 25 | 10 h 20 min |
| March | 48°F | 30°F | 38.8°F | – | <1 | 21 | 11 h 50 min |
| April | 55°F | 35°F | 45.1°F | – | <1 | 13 | 13 h 30 min |
| May | 63°F | 40°F | 51.3°F | – | <1 | 3 | 14 h 50 min |
| June | 68°F | 44°F | 56.3°F | – | <1 | 1 | 15 h 40 min |
| July | 79°F | 49°F | 63.8°F | – | 3 | <1 | 15 h 20 min |
| August | 79°F | 49°F | 64.0°F | – | 4 | <1 | 14 h 10 min |
| September | 72°F | 45°F | 58.4°F | – | 1 | <1 | 12 h 40 min |
| October | 58°F | 37°F | 47.2°F | – | <1 | 6 | 11 h |
| November | 45°F | 31°F | 37.6°F | – | <1 | 19 | 9 h 30 min |
| December | 36°F | 25°F | 30.7°F | – | <1 | 28 | 8 h 40 min |
| Year (annual) | 57°F | 36°F | 46.5°F | – | 8 | 141 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 3°C | −4°C | −0.2°C |
| February | 5°C | −3°C | 1.1°C |
| March | 9°C | −1°C | 3.8°C |
| April | 13°C | 2°C | 7.3°C |
| May | 17°C | 4°C | 10.7°C |
| June | 20°C | 7°C | 13.5°C |
| July | 26°C | 9°C | 17.7°C |
| August | 26°C | 10°C | 17.8°C |
| September | 22°C | 7°C | 14.7°C |
| October | 14°C | 3°C | 8.4°C |
| November | 7°C | −1°C | 3.1°C |
| December | 2°C | −4°C | −0.7°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Hood River Experiment Station (12 miles away), gets 17 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00457794; 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 Snowden?
Normal highs sit between 65°F and 85°F in 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 USC00457794.
When is the last frost at Snowden?
In Snowden, the last spring frost (32°F) comes after May 12 in half of years and after June 7 in one year in ten; the first autumn frost comes before October 11 in half of years and before September 24 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
- May 121 year in 10 after June 7; 9 in 10 after April 25
- First autumn frost, half of years before
- October 111 year in 10 before September 24; 9 in 10 before October 28
NOAA puts the median frost-free season at 149 days, and the season without a hard freeze (28°F) at 188 days.
A hard freeze (28°F) comes after April 23 in half of springs and before October 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Snowden in zone 7a in ZIP code 98602, the nearest ZIP area.
Frost dates for every NOAA station in Washington · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00457794; 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 at Snowden?
In a normal year in Snowden, 8 days a year reach 90°F and 141 nights fall to 32°F or colder.
- Days at 90°F or more
- 8a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 141a normal year
- Days that stay below freezing
- 25high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00457794.
How sunny is it at Snowden?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds at Snowden, 4.2 kWh per square metre a day. July is the sunniest month (93%) and December the cloudiest (56%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 57% | 1.3 |
| February | 66% | 2.3 |
| March | 68% | 3.5 |
| April | 75% | 5.1 |
| May | 78% | 6.3 |
| June | 83% | 7.1 |
| July | 93% | 7.7 |
| August | 91% | 6.5 |
| September | 86% | 4.8 |
| October | 76% | 3.0 |
| November | 64% | 1.6 |
| December | 56% | 1.1 |
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 Snowden record?
A normal year at Snowden brings 6,867 heating degree days, 28% more than the median U.S. place (5,373), and 155 cooling degree days, 83% 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 1,504 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,034 | 0 |
| February | 869 | 0 |
| March | 814 | 0 |
| April | 597 | 0 |
| May | 427 | 1 |
| June | 277 | 15 |
| July | 94 | 55 |
| August | 96 | 64 |
| September | 219 | 21 |
| October | 553 | 0 |
| November | 824 | 0 |
| December | 1,063 | 0 |
| Year (annual) | 6,867 | 155 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00457794. 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 Snowden been warmer than normal?
2023 averaged 49.0°F, 2.5°F above the 1991-2020 normal of 46.5°F. 2 of the 2 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal |
|---|---|---|
| 2022 | 48.9°F | +2.4°F |
| 2023 | 49.0°F | +2.5°F |
Source: observed years: ACIS, station USC00457794. A year counts only with all twelve months complete.
How does Snowden's climate compare?
Snowden is warmer than 12 of the 96 places with their own NOAA record in Washington. Across the 7,247 U.S. stations with normals, its annual mean of 46.5°F is warmer than 25%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Snowden share this climate record?
Mosier has no NOAA station with 1991-2020 normals of its 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.
- Mosier, OR466 people · 9 mi S
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 Snowden's climate
What is the coldest month at Snowden?
December, with a normal high of 36°F and a normal low of 25°F. The warmest is August (79°F by day, 49°F at night).
Does it snow at Snowden?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Hood River Experiment Station (12 miles away), records 17 inches of snow in a normal year.
What plant hardiness zone is Snowden in?
The USDA's 2023 map puts Snowden in zone 7a in ZIP code 98602, the nearest ZIP area.
How late can frost come at Snowden?
In half of years the last 32°F night comes after May 12; in one year in ten it comes after June 7. Waiting until June 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Hood River Experiment Station, OR12 miles from this station, 51.1°F a year
- Glenwood, WA14 miles from this station, 46.7°F a year
- Mount Adams Ranger Station, WA16 miles from this station, 47.8°F a year
- The Dalles, OR16 miles from this station, 53.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made