Photo: Westcoast-trekker · CC BY-SA 4.0Hardly any U.S. towns see fresher July days than Allyn
January mornings start at about 35°. Only 43° separates winter nights from summer afternoons. It is a wet place: more rain and snow fall here than on 95% of U.S. towns. Seedlings are safe outdoors from about March 29, with the first autumn frost due around November 14.
A year in Allyn at a glance
Each month’s typical high and low, and what it brings.
What stands out about Allyn’s climate
Compared with towns across the U.S., with Allyn’s place in Washington beside it.
What a year in Allyn feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 227 frost-free days a year
In half of years the last 32° night comes by March 29 and the first by November 14. Frost and day counts come from NOAA’s station at Bremerton, WA, 15 miles from the town’s center, at about the same height.
The 2023 USDA map puts Allyn’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 18°. 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 57 inches of rain a year
December is the wettest month and July the driest. Rain falls on about 161 days a year. Snow is rare: about 0.3" in a normal year at Wauna 3 W, WA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Allyn
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 Bremerton, WA.
Living with Allyn’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
227 frost-free days in zone 8b. The last frost comes by Mar 29 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 14.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 3.5 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Allyn from natural hazards, earthquakes are the largest share (61%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Allyn and similar climates
TownRatings has no climate map of the towns around Allyn yet.
Climates most like Allyn’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 |
|---|---|---|---|---|
| Allyn, WA | 35° | 77° | 57" | 0.3" |
| Sweet Home, OR | 35° | 82° | 55" | 0.1" |
| Black Mountain, NC | 27° | 82° | 57" | 2.1" |
| Ben Lomond, CA | 40° | 79° | 43" | 0.0" |
| Fairfield Glade, TN | 27° | 84° | 57" | 4.9" |
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 Allyn averaged 0.9° warmer than the 1900s. The biggest change is in January (+2.5°).
A smaller shift than in 84% 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 Allyn compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Allyn’s place among Washington’s.
Allyn weather by month
Highs, lows and precipitation from NOAA’s grid at Allyn’s center; snow, wet days and snow on the ground from Wauna 3 W, WA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 46° | 35° | 9.1" | 0.0" | 20 | 0 | 36° – 45° |
| February | 49° | 35° | 5.7" | 0.0" | 16 | 0 | 36° – 48° |
| March | 54° | 37° | 6.3" | 0.0" | 19 | 0 | 41° – 49° |
| April | 59° | 40° | 4.2" | 0.0" | 16 | 0 | 45° – 55° |
| May | 66° | 46° | 2.3" | 0.0" | 12 | 0 | 51° – 60° |
| June | 71° | 50° | 1.6" | 0.0" | 9 | 0 | 57° – 66° |
| July | 77° | 54° | 0.7" | 0.0" | 5 | 0 | 61° – 69° |
| August | 77° | 54° | 1.1" | 0.0" | 6 | 0 | 62° – 68° |
| September | 71° | 50° | 2.1" | 0.0" | 7 | 0 | 58° – 64° |
| October | 60° | 43° | 5.7" | 0.0" | 14 | 0 | 49° – 56° |
| November | 51° | 38° | 9.2" | 0.0" | 19 | 0 | 40° – 49° |
| December | 45° | 35° | 9.5" | 0.3" | 19 | 0 | 36° – 43° |
| Year | 60° | 43° | 57.1" | 0.3" | 161 | 0 |
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 Allyn’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 Allyn’s center.
- Snow: Wauna 3 W, WA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Bremerton, WA, 15 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 Allyn’s climate
What is the weather like in Allyn?
A typical July afternoon reaches 77°, a January night drops to 35°, and snow is almost unheard of. Milder January nights than 80% of U.S. towns; cooler July afternoons than 97% of U.S. towns.
How cold does it get in Allyn in winter?
December nights average 35°. About 42 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 36°.
How much snow does Allyn get?
About 0.3 inches in a normal winter at Wauna 3 W, WA, so most winters see none.
How hot does it get in Allyn?
July, with a typical high of 77° and a low of 54°. About 4 days a year reach 90° (Bremerton, WA).
When is the first and last frost in Allyn?
In half of years the last spring frost (32°) comes by March 29 and the first fall frost by November 14, about 227 frost-free days, at Bremerton, WA.
What growing zone is Allyn in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 18°.
What is the best time of year to visit Allyn?
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 Allyn getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 84% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Allyn.
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.