Alderwood Manor has some of the coolest summers among U.S. towns
January nights here settle around 36°. Winters are mild: January nights here are milder than in 82% of U.S. towns. Compared with 1901–2000, the average now sits 1.1° higher. Garden planting can start around March 8; autumn frost returns near November 23.
A year in Alderwood Manor at a glance
Each month’s typical high and low, and what it brings.
What stands out about Alderwood Manor’s climate
Compared with towns across the U.S., with Alderwood Manor’s place in Washington beside it.
What a year in Alderwood Manor feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 259 frost-free days a year
In half of years the last 32° night comes by March 8 and the first by November 23. Frost and day counts come from NOAA’s station at Seattle Sand Pt Wsfo, WA, 9 miles from the town’s center, 310 ft lower.
The 2023 USDA map puts Alderwood Manor’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 21°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 4 inches of snow a winter
Snow, measured at Seattle Sand Pt Wsfo, WA, falls mostly in December. Precipitation (rain plus melted snow) adds up to 37 inches a year; December is the wettest month and July the driest. Rain or snow falls on about 163 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Alderwood Manor
96% 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 Seattle Sand Pt Wsfo, WA.
Living with Alderwood Manor’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
259 frost-free days in zone 9a. The last frost comes by Mar 8 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 23.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September.
Parks & trails →Of the yearly building losses FEMA expects in Alderwood Manor from natural hazards, earthquakes are the largest share (72%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Alderwood Manor and its neighbors
Every town next door is within a degree of Alderwood Manor in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Alderwood Manor’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 |
|---|---|---|---|---|
| Alderwood Manor, WA | 36° | 74° | 37" | 3.8" |
| Kentfield, CA | 42° | 74° | 35" | 0.0" |
| West Haven-Sylvan, OR | 36° | 80° | 44" | 3.6" |
| Nantucket, MA | 26° | 76° | 44" | 25" |
| Springs, NY | 24° | 80° | 44" | 27" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Alderwood Manor averaged 1.1° warmer than the 1900s. The biggest change is in January (+2.5°).
A smaller shift than in 72% 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 Alderwood Manor compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Alderwood Manor’s place among Washington’s.
Alderwood Manor weather by month
Highs, lows and precipitation from NOAA’s grid at Alderwood Manor’s center; snow, wet days and snow on the ground from Seattle Sand Pt Wsfo, WA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 46° | 36° | 4.8" | 0.9" | 19 | 1 | 36° – 45° |
| February | 49° | 36° | 3.6" | 1.0" | 16 | 1 | 35° – 47° |
| March | 53° | 38° | 4.2" | 0.0" | 18 | 0 | 41° – 50° |
| April | 58° | 41° | 2.9" | 0.0" | 16 | 0 | 45° – 55° |
| May | 64° | 47° | 2.2" | 0.0" | 12 | 0 | 51° – 60° |
| June | 69° | 51° | 1.7" | 0.0" | 11 | 0 | 57° – 65° |
| July | 74° | 55° | 0.8" | 0.0" | 5 | 0 | 61° – 68° |
| August | 75° | 55° | 1.0" | 0.0" | 6 | 0 | 61° – 67° |
| September | 70° | 51° | 1.7" | 0.0" | 9 | 0 | 58° – 63° |
| October | 59° | 45° | 3.8" | 0.0" | 15 | 0 | 49° – 57° |
| November | 51° | 39° | 5.3" | 0.2" | 19 | 0 | 41° – 50° |
| December | 45° | 35° | 5.4" | 1.7" | 20 | 1 | 36° – 43° |
| Year | 59° | 44° | 37.4" | 3.8" | 163 | 2 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 35° to 47°. September is the most reliable, staying within 6°.
Where Alderwood Manor’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 Alderwood Manor’s center.
- Snow: Seattle Sand Pt Wsfo, WA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Seattle Sand Pt Wsfo, WA, 9 miles from the town’s center, 310 ft lower; 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 Alderwood Manor’s climate
What is the weather like in Alderwood Manor?
A typical July afternoon reaches 74°, a January night drops to 36°, and about 4 inches of snow falls in a normal winter. Milder January nights than 82% of U.S. towns; cooler July afternoons than all but 186 U.S. towns.
How cold does it get in Alderwood Manor in winter?
December nights average 35°. About 25 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 36°.
How much snow does Alderwood Manor get?
About 3.8 inches in a normal winter at Seattle Sand Pt Wsfo, WA, most of it in December, with snow on the ground about 2 days a year.
How hot does it get in Alderwood Manor?
July, with a typical high of 74° and a low of 55°. About 2 days a year reach 90° (Seattle Sand Pt Wsfo, WA).
When is the first and last frost in Alderwood Manor?
In half of years the last spring frost (32°) comes by March 8 and the first fall frost by November 23, about 259 frost-free days, at Seattle Sand Pt Wsfo, WA.
What growing zone is Alderwood Manor in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 21°.
What is the best time of year to visit Alderwood Manor?
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 Alderwood Manor getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 72% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Alderwood Manor.
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.