Sedro-Woolley, WA climate
Sedro-Woolley has mild winters and cool summers, with plenty of rain. A typical July afternoon reaches 74°, a January night drops to 35°, and about 6 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Sedro-Woolley feels like
Winter
Spring
Summer
Fall
Sedro-Woolley 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 | 46° | 35° | 7.4" | 0.6" | 20 | 2 | 33° – 46° |
| February | 49° | 35° | 4.9" | 0.2" | 17 | 0 | 34° – 47° |
| March | 53° | 37° | 5.8" | 0.4" | 20 | 0 | 40° – 49° |
| April | 59° | 41° | 5.0" | 0 | 17 | 0 | 45° – 54° |
| May | 65° | 46° | 3.9" | 0 | 14 | 0 | 51° – 59° |
| June | 69° | 50° | 3.0" | 0 | 13 | 0 | 56° – 64° |
| July | 74° | 53° | 1.6" | 0 | 7 | 0 | 61° – 67° |
| August | 75° | 53° | 1.8" | 0 | 7 | 0 | 60° – 66° |
| September | 70° | 49° | 3.3" | 0 | 12 | 0 | 57° – 62° |
| October | 59° | 44° | 6.0" | 0.1" | 18 | 0 | 48° – 56° |
| November | 50° | 39° | 8.4" | 0.7" | 21 | 1 | 40° – 49° |
| December | 45° | 35° | 6.8" | 3.7" | 21 | 1 | 35° – 43° |
| Year | 59° | 43° | 57.8" | 5.7" | 186 | 4 |
“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 Sedro-Woolley
Sedro-Woolley gets 58 inches of rain and melted snow a year. November is the wettest month and July the driest. Rain or snow falls on about 186 days a year.
About 224 frost-free days a year
In half of years the last 32° night comes by March 27 and the first one by November 6. That leaves about 224 frost-free days for gardens, longer than 84% of U.S. towns.
Heating and cooling a home in Sedro-Woolley
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Sedro-Woolley, 98% of that work is heating and 2% 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 Sedro-Woolley 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 Sedro-Woolley averaged 1.3° warmer than the 1900s. The biggest change is in January (+3.3°). The shift is larger than in 56% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Sedro-Woolley’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. January swings the most: between 1991 and 2020 its average temperature ranged from 33° to 46°. August is the most reliable, staying within 6°.
Common questions about Sedro-Woolley’s climate
What is the coldest month in Sedro-Woolley?
December, with a typical high of 45° and a low of 35°.
What is the hottest month in Sedro-Woolley?
August, with a typical high of 75° and a low of 53°.
How much snow does Sedro-Woolley get?
About 6 inches in a normal winter, most of it in December.
When is the first frost in Sedro-Woolley?
In half of years the first 32° night comes by November 6, and the last spring frost by March 27.
What is the rainiest month in Sedro-Woolley?
November, with 8.4 inches of rain and melted snow. The year totals 58 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Sedro-Woolley itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Sedro-woolley, WA (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.