Snoqualmie Pass, WA climate
Snoqualmie Pass has chilly, snowy winters and cool summers, with plenty of rain. A typical July afternoon reaches 70°, a January night drops to 26°, and about 42 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Snoqualmie Pass feels like
Winter
Spring
Summer
Fall
Snoqualmie Pass weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 35° | 26° | 14.2" | 8.0" | 19 | 13 | 24° – 37° |
| February | 38° | 26° | 9.8" | 9.7" | 17 | 9 | 25° – 39° |
| March | 43° | 29° | 9.5" | 7.7" | 20 | 9 | 31° – 43° |
| April | 49° | 32° | 6.9" | 2.7" | 19 | 2 | 35° – 46° |
| May | 57° | 38° | 4.7" | 0.2" | 17 | 0 | 42° – 54° |
| June | 62° | 43° | 3.6" | 0 | 15 | 0 | 49° – 61° |
| July | 70° | 48° | 1.3" | 0 | 8 | 0 | 52° – 63° |
| August | 71° | 48° | 1.6" | 0 | 8 | 0 | 55° – 64° |
| September | 65° | 43° | 3.9" | 0 | 12 | 0 | 50° – 58° |
| October | 52° | 36° | 9.6" | 0 | 18 | 0 | 41° – 50° |
| November | 40° | 31° | 14.7" | 3.7" | 21 | 3 | 30° – 41° |
| December | 34° | 26° | 14.1" | 10.0" | 20 | 11 | 27° – 34° |
| Year | 51° | 36° | 93.8" | 42.0" | 193 | 47 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Snoqualmie Pass
Snoqualmie Pass gets 94 inches of rain and melted snow a year. November is the wettest month and July the driest. Rain or snow falls on about 193 days a year. Snow covers the ground about 47 days of the year.
About 154 frost-free days a year
In half of years the last 32° night comes by May 14 and the first one by October 17. That leaves about 154 frost-free days for gardens, shorter than 77% of U.S. towns.
Heating and cooling a home in Snoqualmie Pass
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Snoqualmie Pass, 99% of that work is heating and 1% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Snoqualmie Pass compares
Compared with every U.S. town and city on TownTapestry, each counted once.
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°). The shift is smaller than in 55% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Snoqualmie Pass’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 25° to 39°. December is the most reliable, staying within 7°.
Common questions about Snoqualmie Pass’s climate
What is the coldest month in Snoqualmie Pass?
December, with a typical high of 34° and a low of 26°.
What is the hottest month in Snoqualmie Pass?
August, with a typical high of 71° and a low of 48°.
How much snow does Snoqualmie Pass get?
About 42 inches in a normal winter, most of it in December.
When is the first frost in Snoqualmie Pass?
In half of years the first 32° night comes by October 17, and the last spring frost by May 14.
What is the rainiest month in Snoqualmie Pass?
November, with 14.7 inches of rain and melted snow. The year totals 94 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Snoqualmie Pass itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Cedar Lake, WA (16 mi, snow) and Stampede Pass, WA (9 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.