Stampede Pass, Washington climate: Climate normals at a NOAA weather station
Stampede Pass's normal year runs from 24°F December nights to 69°F August afternoons, with 85.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.8°C, December lows of −4°C, August highs of 21°C, 2,159 mm of precipitation a year.
- NOAA stationStampede Pass
- Station IDUSW00024237
- Location47.28°N 121.34°W
- Elevation3,959 ft (1,207 m)
On October 23, the normal high in Stampede Pass is 46°F and the normal low 35°F, and the chance of measurable rain or snow is 57%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Stampede Pass.
- Jan 32° 25°
- Feb 35° 26°
- Mar 40° 29°
- Apr 46° 33°
- May 53° 38°
- Jun 60° 43°
- Jul 68° 50°
- Aug 69° 51°
- Sep 63° 47°
- Oct 49° 38°
- Nov 38° 30°
- Dec 32° 24°
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 Stampede Pass each month?
August is the warmest month, with normal highs of 69°F; December the coldest, with normal lows of 24°F. The most precipitation falls in November (13.71 in), the least in July (1.29 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 32°F | 25°F | 28.6°F | 11.71 | 20 | <1 | 28 | 8 h 50 min |
| February | 35°F | 26°F | 30.4°F | 7.92 | 18 | <1 | 26 | 10 h 20 min |
| March | 40°F | 29°F | 34.6°F | 8.84 | 19 | <1 | 26 | 11 h 50 min |
| April | 46°F | 33°F | 39.2°F | 6.46 | 20 | <1 | 18 | 13 h 30 min |
| May | 53°F | 38°F | 45.9°F | 4.65 | 17 | <1 | 7 | 15 h |
| June | 60°F | 43°F | 51.5°F | 3.30 | 14 | <1 | 1 | 15 h 50 min |
| July | 68°F | 50°F | 58.9°F | 1.29 | 7 | <1 | <1 | 15 h 40 min |
| August | 69°F | 51°F | 60.0°F | 1.56 | 6 | <1 | <1 | 14 h 20 min |
| September | 63°F | 47°F | 54.7°F | 3.95 | 9 | <1 | 1 | 12 h 40 min |
| October | 49°F | 38°F | 43.6°F | 9.00 | 16 | <1 | 7 | 11 h |
| November | 38°F | 30°F | 33.7°F | 13.71 | 21 | <1 | 22 | 9 h 20 min |
| December | 32°F | 24°F | 28.1°F | 12.60 | 20 | <1 | 30 | 8 h 30 min |
| Year (annual) | 49°F | 36°F | 42.4°F | 84.99 | 187 | <1 | 165 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −4°C | −1.9°C | 297 mm |
| February | 2°C | −3°C | −0.9°C | 201 mm |
| March | 5°C | −2°C | 1.4°C | 225 mm |
| April | 8°C | 0°C | 4.0°C | 164 mm |
| May | 12°C | 4°C | 7.7°C | 118 mm |
| June | 15°C | 6°C | 10.8°C | 84 mm |
| July | 20°C | 10°C | 14.9°C | 33 mm |
| August | 21°C | 11°C | 15.6°C | 40 mm |
| September | 17°C | 8°C | 12.6°C | 100 mm |
| October | 10°C | 3°C | 6.4°C | 229 mm |
| November | 3°C | −1°C | 0.9°C | 348 mm |
| December | 0°C | −4°C | −2.2°C | 320 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Cedar Lake (22 miles away), gets 42 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00024237; 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 Stampede Pass?
Normal highs sit between 65°F and 85°F in July and August. Of those, August has the fewest days with rain (6).
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 USW00024237.
When is the last frost at Stampede Pass?
In Stampede Pass, the last spring frost (32°F) comes after May 14 in half of years and after June 5 in one year in ten; the first autumn frost comes before October 17 in half of years and before October 1 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 141 year in 10 after June 5; 9 in 10 after April 26
- First autumn frost, half of years before
- October 171 year in 10 before October 1; 9 in 10 before November 1
NOAA puts the median frost-free season at 154 days, and the season without a hard freeze (28°F) at 192 days.
A hard freeze (28°F) comes after April 21 in half of springs and before November 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Stampede Pass in zone 7a in ZIP code 98925, 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 7b: the coldest night of a typical year reaches 8°F (15 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 Washington · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00024237; 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 Stampede Pass?
In a normal year in Stampede Pass, a 90°F day is rare, 165 nights fall to 32°F or colder and 187 days bring measurable precipitation.
- Days at 90°F or more
- fewer than 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 165a normal year
- Days that stay below freezing
- 69high of 32°F or less
- Days with 0.01 inch of precipitation
- 187a normal year
The highest temperature in this station's record (since 1944) is 98°F, on June 29, 2021; the lowest is −21°F, on December 30, 1968.
The wettest calendar year on that record is 1975, with 124.10 in; the snowiest season is 1971–72, with 704.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00024237; records: ACIS (NOAA Regional Climate Centers), station USW00024237. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Stampede Pass?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds at Stampede Pass, 3.8 kWh per square metre a day. July is the sunniest month (86%) and December the cloudiest (54%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 56% | 1.2 |
| February | 64% | 2.1 |
| March | 63% | 3.1 |
| April | 67% | 4.6 |
| May | 70% | 5.7 |
| June | 74% | 6.3 |
| July | 86% | 7.0 |
| August | 85% | 5.9 |
| September | 79% | 4.3 |
| October | 69% | 2.5 |
| November | 58% | 1.3 |
| December | 54% | 0.9 |
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 Stampede Pass record?
A normal year at Stampede Pass brings 8,316 heating degree days, 55% more than the median U.S. place (5,373), and 100 cooling degree days, 89% fewer than the median (908). Ten months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 999 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,128 | 0 |
| February | 970 | 0 |
| March | 943 | 0 |
| April | 774 | 0 |
| May | 594 | 2 |
| June | 414 | 8 |
| July | 224 | 35 |
| August | 198 | 42 |
| September | 323 | 13 |
| October | 665 | 0 |
| November | 940 | 0 |
| December | 1,144 | 0 |
| Year (annual) | 8,316 | 100 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00024237. 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 Stampede Pass been warmer than normal?
Over 53 complete years from 1948 to 2025, 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: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Stampede Pass's climate compare?
Stampede Pass is warmer than 0 of the 96 places with their own NOAA record in Washington, and wetter than 85. Across the 7,247 U.S. stations with normals, its annual mean of 42.4°F is warmer than 10%.
In the Köppen classification computed from these normals, Stampede Pass is Dsb: continental, 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 Stampede Pass share this climate record?
Snoqualmie Pass 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.
- Snoqualmie Pass, WA354 people · 9 mi N
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 Stampede Pass's climate
What is the coldest month at Stampede Pass?
December, with a normal high of 32°F and a normal low of 24°F. The warmest is August (69°F by day, 51°F at night).
Does it snow at Stampede Pass?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Cedar Lake (22 miles away), records 42 inches of snow in a normal year.
What is the rainiest month at Stampede Pass?
November, with 13.71 in of precipitation in a normal year; the driest is July with 1.29 in.
What plant hardiness zone is Stampede Pass in?
The USDA's 2023 map puts Stampede Pass in zone 7a in ZIP code 98925, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 8°F (15 years, 1991-2020): zone 7b.
How late can frost come at Stampede Pass?
In half of years the last 32°F night comes after May 14; in one year in ten it comes after June 5. Waiting until June 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Easton, WA7 miles from this station, 45.2°F a year
- Cle Elum, WA21 miles from this station, 46.4°F a year
- Cedar Lake, WA22 miles from this station, 46.7°F a year
- Palmer (3 mi ESE), WA24 miles from this station, 50.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made