Snoqualmie, Washington climate: Normal weather by month, frost dates and records
Snoqualmie's normal year runs from 36°F December nights to 77°F August afternoons, with 63.3 inches of precipitation and 4 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.9°C, December lows of 2°C, August highs of 25°C, 1,607 mm of precipitation a year.
- NOAA stationSnoqualmie Falls
- Station IDUSC00457773
- Location47.54°N 121.84°W
- Elevation440 ft (134 m)
- Population13,748
On October 14, the normal high in Snoqualmie is 60°F and the normal low 44°F, and the chance of measurable rain or snow is 52%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Snoqualmie.
- Jan 46° 36°
- Feb 50° 35°
- Mar 54° 37°
- Apr 59° 40°
- May 64° 46°
- Jun 69° 51°
- Jul 76° 54°
- Aug 77° 54°
- Sep 70° 49°
- Oct 60° 44°
- Nov 51° 38°
- Dec 46° 36°
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 Snoqualmie each month?
August is the warmest month, with normal highs of 77°F; December the coldest, with normal lows of 36°F. The most precipitation falls in November (9.47 in), the least in August (1.22 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 46°F | 36°F | 41.1°F | 8.64 | 1.5 | 21 | <1 | 11 | 8 h 50 min |
| February | 50°F | 35°F | 42.4°F | 5.83 | 0.2 | 16 | <1 | 12 | 10 h 10 min |
| March | 54°F | 37°F | 45.4°F | 6.74 | 0.3 | 20 | <1 | 8 | 11 h 50 min |
| April | 59°F | 40°F | 49.5°F | 5.29 | 0.0 | 18 | <1 | 3 | 13 h 30 min |
| May | 64°F | 46°F | 55.1°F | 4.04 | 0.0 | 15 | <1 | <1 | 15 h |
| June | 69°F | 51°F | 59.8°F | 3.15 | 0.0 | 13 | <1 | <1 | 16 h |
| July | 76°F | 54°F | 64.9°F | 1.24 | 0.0 | 7 | 1 | <1 | 15 h 40 min |
| August | 77°F | 54°F | 65.2°F | 1.22 | 0.0 | 6 | 1 | <1 | 14 h 20 min |
| September | 70°F | 49°F | 59.7°F | 3.02 | 0.0 | 11 | <1 | <1 | 12 h 40 min |
| October | 60°F | 44°F | 51.5°F | 6.22 | 0.0 | 17 | <1 | 2 | 11 h |
| November | 51°F | 38°F | 44.7°F | 9.47 | 0.1 | 21 | <1 | 8 | 9 h 20 min |
| December | 46°F | 36°F | 40.7°F | 8.42 | 1.5 | 20 | <1 | 11 | 8 h 30 min |
| Year (annual) | 60°F | 43°F | 51.7°F | 63.28 | 3.6 | 184 | 3 | 54 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 8°C | 2°C | 5.1°C | 219 mm | 4 cm |
| February | 10°C | 2°C | 5.8°C | 148 mm | 1 cm |
| March | 12°C | 3°C | 7.4°C | 171 mm | 1 cm |
| April | 15°C | 5°C | 9.7°C | 134 mm | 0 cm |
| May | 18°C | 8°C | 12.8°C | 103 mm | 0 cm |
| June | 21°C | 10°C | 15.4°C | 80 mm | 0 cm |
| July | 24°C | 12°C | 18.3°C | 31 mm | 0 cm |
| August | 25°C | 12°C | 18.4°C | 31 mm | 0 cm |
| September | 21°C | 10°C | 15.4°C | 77 mm | 0 cm |
| October | 15°C | 6°C | 10.8°C | 158 mm | 0 cm |
| November | 11°C | 3°C | 7.1°C | 241 mm | 0 cm |
| December | 8°C | 2°C | 4.8°C | 214 mm | 4 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00457773; 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 Snoqualmie?
Normal highs sit between 65°F and 85°F in June, July, August and September. 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 USC00457773.
When is the last frost in Snoqualmie?
In Snoqualmie, the last spring frost (32°F) comes after March 30 in half of years and after April 21 in one year in ten; the first autumn frost comes before November 7 in half of years and before October 22 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 301 year in 10 after April 21; 9 in 10 after March 4
- First autumn frost, half of years before
- November 71 year in 10 before October 22; 9 in 10 before December 1
NOAA puts the median frost-free season at 223 days, and the season without a hard freeze (28°F) at 277 days.
A hard freeze (28°F) comes after February 27 in half of springs and before November 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Snoqualmie in zone 8b in ZIP code 98024, 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 USC00457773; 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 Snoqualmie?
In a normal year in Snoqualmie, 3 days a year reach 90°F, 54 nights fall to 32°F or colder and 184 days bring measurable precipitation.
- Days at 90°F or more
- 3a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 54a normal year
- Days that stay below freezing
- 2high of 32°F or less
- Days with 0.01 inch of precipitation
- 184a normal year
- Days with 1 inch of snow or more
- 2a normal year
The highest temperature in this station's record (since 1899) is 104°F, on July 3, 1906; the lowest is −3°F, on February 1, 1950.
The wettest calendar year on that record is 1990, with 81.41 in; the snowiest season is 1936–37, with 61.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00457773; records: ACIS (NOAA Regional Climate Centers), station USC00457773. Records use complete months only; a month missing more than three days is left out.
How sunny is Snoqualmie?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Snoqualmie, 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 much heating and cooling does Snoqualmie need?
A normal year in Snoqualmie brings 4,991 heating degree days, 7% fewer than the median U.S. place (5,373), and 151 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 1,889 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 741 | 0 |
| February | 631 | 0 |
| March | 606 | 0 |
| April | 465 | 0 |
| May | 311 | 4 |
| June | 173 | 17 |
| July | 61 | 58 |
| August | 54 | 60 |
| September | 169 | 11 |
| October | 419 | 0 |
| November | 609 | 0 |
| December | 752 | 0 |
| Year (annual) | 4,991 | 151 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00457773. 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.
How does Snoqualmie's climate compare?
Snoqualmie is warmer than 75 of the other 95 places with their own NOAA record in Washington, and wetter than 74. Across the 7,247 U.S. stations with normals, its annual mean of 51.7°F is warmer than 48%.
In the Köppen classification computed from these normals, Snoqualmie 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 Snoqualmie share this climate record?
5 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.
- Sammamish, WAalso near: Renton (11 mi, 53.6°F a year); Seattle Sand Point Weather Office (12 mi, 53.2°F a year)66,474 people · 10 mi W
- North Bend, WA8,553 people · 5 mi SE
- Carnation, WA2,279 people · 8 mi NW
- Fall City, WA1,743 people · 4 mi NW
- Ames Lake, WA1,138 people · 9 mi NW
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 Snoqualmie's climate
What is the coldest month in Snoqualmie?
December, with a normal high of 46°F and a normal low of 36°F. The warmest is August (77°F by day, 54°F at night).
Does it snow in Snoqualmie?
Yes: 4 inches in a normal year, falling on 2 days with 0.1 inch or more, the most in January (1.5 inches).
What is the rainiest month in Snoqualmie?
November, with 9.47 in of precipitation in a normal year; the driest is August with 1.22 in.
What plant hardiness zone is Snoqualmie in?
The USDA's 2023 map puts Snoqualmie in zone 8b in ZIP code 98024, the nearest ZIP area.
How late can frost come in Snoqualmie?
In half of years the last 32°F night comes after March 30; in one year in ten it comes after April 21. Waiting until April 21 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Cedar Lake, WA9 miles from this station, 46.7°F a year
- Landsburg, WA13 miles from this station, 50.5°F a year
- Tolt S Fork Reservoir, WA13 miles from this station, 48.1°F a year
- Palmer (3 mi ESE), WA16 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