Lake Cassidy has mild winters and cool summers, with plenty of rain
A typical July afternoon reaches 74°, a January night drops to 35°, and about 3 inches of snow falls in a normal winter.
A year in Lake Cassidy at a glance
Each month’s typical high and low, and what it brings.
What stands out about Lake Cassidy’s climate
Read from where Lake Cassidy sits among Washington’s towns. The page puts what stands out first.
What a year in Lake Cassidy feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
3 inches of snow, 55 of rain and melt
November is the wettest month and July the driest. Rain or snow falls on about 187 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
About 223 frost-free days a year
In half of years the last 32° night comes by March 24 and the first by November 2.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Living with Lake Cassidy’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
223 frost-free days. The last frost comes by Mar 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 Nov 2.
About 3" in a normal winter.
Months averaging under 55° run from October through April. Heating is 97% of the year’s heating-and-cooling load.
90° days are rare: July afternoons average 74°.
The nicest months are May, June, July, August and September. 1.6 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 →Lake Cassidy and its neighbors
Lochsloy has the coldest January nights next door (35°) and Marysville the hottest July afternoons (75°). Tap a town to see its climate.
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 Lake Cassidy averaged 1.0° warmer than the 1900s. The biggest change is in January (+2.7°).
A smaller shift than in 73% of U.S. towns.
Change by month
How Lake Cassidy compares
Against every U.S. town on TownTapestry, each counted once, with its place in Washington.
Lake Cassidy 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° | 35° | 7.0" | 0.1" | 20 | 1 | 35° – 44° |
| February | 48° | 35° | 5.0" | 2.2" | 17 | 1 | 33° – 47° |
| March | 53° | 37° | 5.8" | 0.2" | 20 | 0 | 41° – 49° |
| April | 58° | 40° | 4.6" | 0 | 17 | 0 | 44° – 54° |
| May | 64° | 46° | 3.5" | 0 | 14 | 0 | 51° – 59° |
| June | 68° | 50° | 2.7" | 0 | 12 | 0 | 56° – 64° |
| July | 74° | 54° | 1.2" | 0 | 6 | 0 | 60° – 68° |
| August | 75° | 54° | 1.5" | 0 | 6 | 0 | 60° – 67° |
| September | 70° | 50° | 2.9" | 0 | 11 | 0 | 56° – 63° |
| October | 59° | 44° | 5.6" | 0 | 18 | 0 | 48° – 56° |
| November | 50° | 38° | 8.0" | 0.3" | 22 | 0 | 40° – 49° |
| December | 44° | 35° | 7.1" | 0.2" | 22 | 1 | 35° – 42° |
| Year | 59° | 43° | 54.8" | 3.0" | 187 | 3 |
Heating and cooling a home in Lake Cassidy
97% 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 33° to 47°. September is the most reliable, staying within 6°.
Common questions about Lake Cassidy’s climate
What is the coldest month in Lake Cassidy?
December, with a typical high of 44° and a low of 35°.
What is the hottest month in Lake Cassidy?
August, with a typical high of 75° and a low of 54°.
How much snow does Lake Cassidy get?
About 3 inches in a normal winter, most of it in February.
When is the first frost in Lake Cassidy?
In half of years the first 32° night comes by November 2, and the last spring frost by March 24.
What is the rainiest month in Lake Cassidy?
November, with 8.0 inches of rain and melted snow. The year totals 55 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Lake Cassidy.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Lake Cassidy itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Monroe, WA (16 mi, snow) and Everett, WA (8 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.