US Post Office-Sedro Woolley Main · Photo: Joe Mabel · CC BY-SA 3.0Few U.S. towns have cooler summers than Sedro-Woolley
In January the night’s low is typically 35°. Its yearly precipitation tops that of 96% of U.S. towns. The latest 30-year average runs 1.3° warmer than 1901–2000’s, with January up the most. The heating season runs November to April: each of those months averages under 50°.
A year in Sedro-Woolley at a glance
Each month’s typical high and low, and what it brings.
What stands out about Sedro-Woolley’s climate
Compared with towns across the U.S., with Sedro-Woolley’s place in Washington beside it.
What a year in Sedro-Woolley feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 224 frost-free days a year
In half of years the last 32° night comes by March 27 and the first by November 6. Frost and day counts come from NOAA’s station at Sedro-woolley, WA, 1.1 miles from the town’s center, at about the same height.
The 2023 USDA map puts Sedro-Woolley’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 17°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 6 inches of snow a winter
Snow, measured at Sedro-woolley, WA, falls mostly in December. Precipitation (rain plus melted snow) adds up to 58 inches a year; November is the wettest month and July the driest. Rain or snow falls on about 186 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Sedro-Woolley
98% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Sedro-woolley, WA.
Living with Sedro-Woolley’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
224 frost-free days in zone 8b. The last frost comes by Mar 27 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 6.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 2.8 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Sedro-Woolley from natural hazards, river flooding is the largest share (70%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Sedro-Woolley and similar climates
TownRatings has no climate map of the towns around Sedro-Woolley yet.
Climates most like Sedro-Woolley’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Sedro-Woolley, WA | 35° | 74° | 58" | 5.7" |
| Fortuna, CA | 42° | 70° | 55" | 0.7" |
| Sandy, OR | 35° | 80° | 57" | 2.2" |
| Boone, NC | 24° | 79° | 58" | 26" |
| Orleans, MA | 25° | 77° | 45" | 25" |
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 Sedro-Woolley averaged 1.3° warmer than the 1900s. The biggest change is in January (+3.3°).
A smaller shift than in 55% 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 Sedro-Woolley compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Sedro-Woolley’s place among Washington’s.
Sedro-Woolley weather by month
Highs, lows and precipitation from NOAA’s grid at Sedro-Woolley’s center; snow, wet days and snow on the ground from Sedro-woolley, WA. 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" | 0.0" | 17 | 0 | 45° – 54° |
| May | 65° | 46° | 3.9" | 0.0" | 14 | 0 | 51° – 59° |
| June | 69° | 50° | 3.0" | 0.0" | 13 | 0 | 56° – 64° |
| July | 74° | 53° | 1.6" | 0.0" | 7 | 0 | 61° – 67° |
| August | 75° | 53° | 1.8" | 0.0" | 7 | 0 | 60° – 66° |
| September | 70° | 49° | 3.3" | 0.0" | 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 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 33° to 46°. August is the most reliable, staying within 6°.
Where Sedro-Woolley’s 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 Sedro-Woolley’s center.
- Snow: Sedro-woolley, WA (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Sedro-woolley, WA, 1.1 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- 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 Sedro-Woolley’s climate
What is the weather like in Sedro-Woolley?
A typical July afternoon reaches 74°, a January night drops to 35°, and about 6 inches of snow falls in a normal winter. Milder January nights than 81% of U.S. towns; cooler July afternoons than all but 171 U.S. towns.
How cold does it get in Sedro-Woolley in winter?
December nights average 35°. About 46 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 35°.
How much snow does Sedro-Woolley get?
About 5.7 inches in a normal winter at Sedro-woolley, WA, most of it in December, with snow on the ground about 4 days a year.
How hot does it get in Sedro-Woolley?
July, with a typical high of 74°. 90° days are rare: none in a normal year at Sedro-woolley, WA.
When is the first and last frost in Sedro-Woolley?
In half of years the last spring frost (32°) comes by March 27 and the first fall frost by November 6, about 224 frost-free days, at Sedro-woolley, WA.
What growing zone is Sedro-Woolley in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 17°.
What is the best time of year to visit Sedro-Woolley?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Sedro-Woolley getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 55% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Sedro-Woolley.
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.