Coupeville has mild winters and cool summers, with very little rain
A typical July afternoon reaches 71°, a January night drops to 36°, and about 3 inches of snow falls in a normal winter.
A year in Coupeville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Coupeville’s climate
Read from where Coupeville sits among Washington’s towns. The page puts what stands out first.
What a year in Coupeville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Living with Coupeville’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
237 frost-free days. The last frost comes by Mar 17 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 11.
About 3" in a normal winter.
Months averaging under 55° run from October through May. Heating is 100% of the year’s heating-and-cooling load.
90° days are rare: July afternoons average 71°.
The nicest months are May, June, July, August and September. 2.6 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →3 inches of snow, 23 of rain and melt
November is the wettest month and July the driest. Rain or snow falls on about 131 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
About 237 frost-free days a year
In half of years the last 32° night comes by March 17 and the first by November 11.
Freezing nights by month
Average nights at or below 32°
Warmer than it used to be
The last 30 years in Coupeville averaged 1.2° warmer than the 1900s. The biggest change is in January (+2.6°).
A smaller shift than in 56% of U.S. towns.
Change by month
How Coupeville compares
Against every U.S. town on TownTapestry, each counted once, with its place in Washington.
Coupeville 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 | 47° | 36° | 2.8" | 0 | 16 | 0 | 35° – 46° |
| February | 49° | 36° | 2.0" | 0 | 12 | 0 | 37° – 48° |
| March | 53° | 38° | 2.0" | 0.3" | 14 | 0 | 41° – 49° |
| April | 58° | 41° | 1.8" | 0 | 12 | 0 | 45° – 54° |
| May | 62° | 46° | 1.7" | 0 | 9 | 0 | 51° – 57° |
| June | 67° | 49° | 1.3" | 0 | 9 | 0 | 55° – 61° |
| July | 71° | 52° | 0.7" | 0 | 4 | 0 | 59° – 64° |
| August | 71° | 52° | 0.8" | 0 | 4 | 0 | 59° – 64° |
| September | 67° | 49° | 1.2" | 0 | 8 | 0 | 55° – 61° |
| October | 58° | 44° | 2.3" | 0 | 12 | 0 | 49° – 56° |
| November | 51° | 39° | 3.4" | 0.6" | 16 | 0 | 41° – 50° |
| December | 46° | 36° | 2.7" | 1.6" | 16 | 0 | 36° – 45° |
| Year | 58° | 43° | 22.8" | 2.5" | 131 | 0 |
Heating and cooling a home in Coupeville
100% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 37° to 48°. August is the most reliable, staying within 5°.
Common questions about Coupeville’s climate
What is the coldest month in Coupeville?
December, with a typical high of 46° and a low of 36°.
What is the hottest month in Coupeville?
August, with a typical high of 71° and a low of 52°.
How much snow does Coupeville get?
About 3 inches in a normal winter, most of it in December.
When is the first frost in Coupeville?
In half of years the first 32° night comes by November 11, and the last spring frost by March 17.
What is the rainiest month in Coupeville?
November, with 3.4 inches of rain and melted snow. The year totals 23 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Coupeville.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Coupeville itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Coupeville 1 S, WA (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.