Photo: Quintin Soloviev · CC BY 4.0Steilacoom’s winters are milder and less snowy than most of the U.S.
A typical July afternoon reaches 77°, a January night drops to 36°, and about 4 inches of snow falls in a normal winter.
A year in Steilacoom at a glance
Each month’s typical high and low, and what it brings.
What stands out about Steilacoom’s climate
Compared with towns across the U.S., with Steilacoom’s place in Washington beside it.
What a year in Steilacoom feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 254 frost-free days a year
In half of years the last 32° night comes by March 11 and the first by November 21. Frost and day counts come from NOAA’s station at Tacoma Narrows Airport, 7 miles from the town’s center, 120 ft higher.
The 2023 USDA map puts Steilacoom’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°
90° days by month
Average days at 90° or more
About 4 inches of snow a winter
Snow, measured at Olympia Airport, falls mostly in January. Precipitation (rain plus melted snow) adds up to 42 inches a year; November 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 Steilacoom
97% 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 Tacoma Narrows Airport.
Living with Steilacoom’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
254 frost-free days in zone 8b. The last frost comes by Mar 11 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 21.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 4.3 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Steilacoom from natural hazards, earthquakes are the largest share (68%); heat waves, cold waves, winter storms and ice storms together are 4%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Steilacoom and its neighbors
Every town next door is within a degree of Steilacoom in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Steilacoom’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 |
|---|---|---|---|---|
| Steilacoom, WA | 36° | 77° | 42" | 3.9" |
| Ben Lomond, CA | 40° | 79° | 43" | 0.0" |
| Cottage Grove, OR | 35° | 82° | 47" | 2.7" |
| Chatham, MA | 25° | 77° | 44" | 25" |
| Brigantine, NJ | 28° | 83° | 45" | 10" |
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 Steilacoom averaged 0.9° warmer than the 1900s. The biggest change is in January (+2.5°).
A smaller shift than in 87% 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 Steilacoom compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Steilacoom’s place among Washington’s.
Steilacoom weather by month
Highs, lows and precipitation from NOAA’s grid at Steilacoom’s center; snow, wet days and snow on the ground from Olympia Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 47° | 36° | 6.2" | 2.0" | 20 | 1 | 37° – 46° |
| February | 50° | 35° | 4.1" | 0.6" | 16 | 0 | 36° – 48° |
| March | 55° | 38° | 4.6" | 0.1" | 19 | 0 | 42° – 51° |
| April | 60° | 41° | 3.4" | 0.0" | 16 | 0 | 46° – 55° |
| May | 67° | 47° | 2.0" | 0.0" | 11 | 0 | 53° – 60° |
| June | 71° | 51° | 1.4" | 0.0" | 9 | 0 | 58° – 67° |
| July | 77° | 55° | 0.6" | 0.0" | 4 | 0 | 61° – 70° |
| August | 78° | 55° | 0.9" | 0.0" | 5 | 0 | 63° – 69° |
| September | 72° | 50° | 1.6" | 0.0" | 8 | 0 | 58° – 64° |
| October | 61° | 44° | 4.2" | 0.0" | 15 | 0 | 49° – 57° |
| November | 52° | 39° | 6.5" | 0.0" | 20 | 0 | 41° – 50° |
| December | 47° | 35° | 6.3" | 1.2" | 20 | 0 | 37° – 44° |
| Year | 61° | 44° | 41.8" | 3.9" | 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 36° to 48°. September is the most reliable, staying within 6°.
Where Steilacoom’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 Steilacoom’s center.
- Snow: Olympia Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Tacoma Narrows Airport, 7 miles from the town’s center, 120 ft higher; 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 Steilacoom’s climate
What is the weather like in Steilacoom?
A typical July afternoon reaches 77°, a January night drops to 36°, and about 4 inches of snow falls in a normal winter. Milder January nights than 83% of U.S. towns; cooler July afternoons than 97% of U.S. towns.
How cold does it get in Steilacoom in winter?
December nights average 35°. About 21 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 37°.
How much snow does Steilacoom get?
About 3.9 inches in a normal winter at Olympia Airport, most of it in January, with snow on the ground about 2 days a year.
How hot does it get in Steilacoom?
July, with a typical high of 77° and a low of 55°. About 2 days a year reach 90° (Tacoma Narrows Airport).
When is the first and last frost in Steilacoom?
In half of years the last spring frost (32°) comes by March 11 and the first fall frost by November 21, about 254 frost-free days, at Tacoma Narrows Airport.
What growing zone is Steilacoom 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 Steilacoom?
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 Steilacoom getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 87% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Steilacoom.
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.