Morton has mild winters and pleasant summers, with plenty of rain
A typical July afternoon reaches 78°, a January night drops to 33°, and about 3 inches of snow falls in a normal winter.
A year in Morton at a glance
Each month’s typical high and low, and what it brings.
What stands out about Morton’s climate
Read from where Morton sits among Washington’s towns. The page puts what stands out first.
3 inches of snow, 58 of rain and melt
December is the wettest month and July the driest. Rain or snow falls on about 177 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
What a year in Morton feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 176 frost-free days a year
In half of years the last 32° night comes by April 24 and the first by October 15.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Living with Morton’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
176 frost-free days. The last frost comes by Apr 24 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 15.
About 3" in a normal winter.
Months averaging under 55° run from October through May. Heating is 98% of the year’s heating-and-cooling load.
About 7 days a year reach 90°, and July afternoons average 78°.
The nicest months are May, June, July, August and September. 0.0 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 →Warmer than it used to be
The last 30 years in Morton averaged 1.1° warmer than the 1900s. The biggest change is in January (+3.2°).
A smaller shift than in 59% of U.S. towns.
Change by month
How Morton compares
Against every U.S. town on TownTapestry, each counted once, with its place in Washington.
Morton 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 | 45° | 33° | 7.7" | 1.1" | 20 | 1 | 34° – 45° |
| February | 48° | 33° | 5.6" | 1.3" | 16 | 1 | 34° – 47° |
| March | 52° | 34° | 6.0" | 0 | 20 | 0 | 38° – 49° |
| April | 58° | 37° | 5.2" | 0 | 18 | 0 | 42° – 54° |
| May | 66° | 43° | 3.8" | 0 | 14 | 0 | 49° – 58° |
| June | 70° | 47° | 2.9" | 0 | 12 | 0 | 54° – 66° |
| July | 78° | 51° | 0.9" | 0 | 6 | 0 | 59° – 68° |
| August | 78° | 50° | 1.2" | 0 | 6 | 0 | 60° – 68° |
| September | 71° | 46° | 2.6" | 0 | 10 | 0 | 55° – 62° |
| October | 59° | 40° | 5.4" | 0 | 16 | 0 | 45° – 54° |
| November | 49° | 36° | 8.2" | 0 | 19 | 0 | 37° – 47° |
| December | 44° | 32° | 8.3" | 1.0" | 20 | 1 | 33° – 41° |
| Year | 60° | 40° | 57.8" | 3.4" | 177 | 2 |
Heating and cooling a home in Morton
98% 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 34° to 47°. September is the most reliable, staying within 7°.
Common questions about Morton’s climate
What is the coldest month in Morton?
December, with a typical high of 44° and a low of 32°.
What is the hottest month in Morton?
August, with a typical high of 78° and a low of 50°. About 7 days a year reach 90°.
How much snow does Morton get?
About 3 inches in a normal winter, most of it in February.
When is the first frost in Morton?
In half of years the first 32° night comes by October 15, and the last spring frost by April 24.
What is the rainiest month in Morton?
December, with 8.3 inches of rain and melted snow. The year totals 58 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Morton.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Morton itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Mayfield Pwr Plt, WA (15 mi, snow) and Glenoma, WA (7 mi, frost, heat and degree days). 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.