Snoqualmie Pass sits near the top of U.S. towns for precipitation, with 94 inches a year
Sunny July days climb to about 70°. From frosty January to warm July, readings climb 45°. Its July afternoons stay fresher than in almost every U.S. town. Radiators earn their keep from October to May, the months that average under 50°.
A year in Snoqualmie Pass at a glance
Each month’s typical high and low, and what it brings.
What stands out about Snoqualmie Pass’ climate
Compared with towns across the U.S., with Snoqualmie Pass’ place in Washington beside it.
What a year in Snoqualmie Pass feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 154 frost-free days a year
In half of years the last 32° night comes by May 14 and the first by October 17. Frost and day counts come from Stampede Pass, WA, 9 miles away.
The 2023 USDA map puts Snoqualmie Pass’ center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 9°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 94 inches of rain a year
November is the wettest month and July the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Snoqualmie Pass
99% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from September through June.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Stampede Pass, WA.
Living with Snoqualmie Pass’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
154 frost-free days in zone 7b. The last frost comes by May 14 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 17.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September. 15 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Snoqualmie Pass from natural hazards, wildfire is the largest share (45%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Snoqualmie Pass and similar climates
TownRatings has no climate map of the towns around Snoqualmie Pass yet.
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Snoqualmie Pass averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.8°).
A smaller shift than in 65% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Snoqualmie Pass compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Snoqualmie Pass’ place among Washington’s.
Snoqualmie Pass weather by month
Highs, lows and precipitation from NOAA’s grid at Snoqualmie Pass’ center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 35° | 26° | 14.2" | 24° – 37° |
| February | 38° | 26° | 9.8" | 25° – 39° |
| March | 43° | 29° | 9.5" | 31° – 43° |
| April | 49° | 32° | 6.9" | 35° – 46° |
| May | 57° | 38° | 4.7" | 42° – 54° |
| June | 62° | 43° | 3.6" | 49° – 61° |
| July | 70° | 48° | 1.3" | 52° – 63° |
| August | 71° | 48° | 1.6" | 55° – 64° |
| September | 65° | 43° | 3.9" | 50° – 58° |
| October | 52° | 36° | 9.6" | 41° – 50° |
| November | 40° | 31° | 14.7" | 30° – 41° |
| December | 34° | 26° | 14.1" | 27° – 34° |
| Year | 51° | 36° | 93.8" |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 25° to 39°. December is the most reliable, staying within 7°.
Where Snoqualmie Pass’ numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Snoqualmie Pass’ center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Stampede Pass, WA, 9 miles from the town’s center, 840 ft higher; no station nearby passes every check; this is the nearest one in the same valley, flagged above.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Snoqualmie Pass’ climate
What is the weather like in Snoqualmie Pass?
A typical July afternoon reaches 70°, a January night drops to 26°. Milder January nights than 67% of U.S. towns; cooler July afternoons than all but 81 U.S. towns.
How cold does it get in Snoqualmie Pass in winter?
December nights average 26°. About 165 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 27°.
How hot does it get in Snoqualmie Pass?
July, with a typical high of 70°. 90° days are rare: none in a normal year at Stampede Pass, WA.
When is the first and last frost in Snoqualmie Pass?
In half of years the last spring frost (32°) comes by May 14 and the first fall frost by October 17, about 154 frost-free days, at Stampede Pass, WA.
What growing zone is Snoqualmie Pass in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 9°.
What is the best time of year to visit Snoqualmie Pass?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Snoqualmie Pass getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 65% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Snoqualmie Pass.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.