Maple Valley, WA climate
Maple Valley has mild winters and cool summers, with plenty of rain. A typical July afternoon reaches 76°, a January night drops to 35°, and about 18 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Maple Valley feels like
Winter
Spring
Summer
Fall
Maple Valley 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 | 46° | 35° | 6.9" | 6.1" | 21 | 4 | 36° – 45° |
| February | 49° | 34° | 4.8" | 4.0" | 18 | 2 | 34° – 47° |
| March | 53° | 36° | 5.3" | 2.0" | 22 | 2 | 40° – 49° |
| April | 58° | 40° | 4.6" | 0.4" | 20 | 0 | 44° – 55° |
| May | 65° | 45° | 3.4" | 0 | 17 | 0 | 50° – 59° |
| June | 69° | 50° | 2.7" | 0 | 15 | 0 | 56° – 65° |
| July | 76° | 53° | 1.1" | 0 | 9 | 0 | 60° – 68° |
| August | 77° | 53° | 1.3" | 0 | 8 | 0 | 61° – 69° |
| September | 70° | 49° | 2.4" | 0 | 11 | 0 | 57° – 64° |
| October | 60° | 43° | 5.0" | 0 | 17 | 0 | 48° – 56° |
| November | 51° | 38° | 7.5" | 0.9" | 21 | 2 | 39° – 49° |
| December | 45° | 34° | 6.5" | 4.1" | 21 | 3 | 35° – 42° |
| Year | 60° | 43° | 51.5" | 17.5" | 200 | 13 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Maple Valley
Maple Valley gets 52 inches of rain and melted snow a year. November is the wettest month and July the driest. Rain or snow falls on about 200 days a year. Snow covers the ground about 13 days of the year.
About 187 frost-free days a year
In half of years the last 32° night comes by April 20 and the first one by October 25. That leaves about 187 frost-free days for gardens, longer than 60% of U.S. towns.
Heating and cooling a home in Maple Valley
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Maple Valley, 98% of that work is heating and 2% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Maple Valley and its neighbors
Maple Valley borders 4 towns with climate data. January nights across them vary by 1.2°. Hobart has the coldest January nights (35°) and Kent the hottest July afternoons (77°). Maple Valley’s January low is 35° and its July high 76°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Maple Valley compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Maple Valley averaged 0.9° warmer than the 1900s. The biggest change is in January (+2.7°). The shift is smaller than in 79% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Maple Valley’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 34° to 47°. December is the most reliable, staying within 7°.
Common questions about Maple Valley’s climate
What is the coldest month in Maple Valley?
December, with a typical high of 45° and a low of 34°.
What is the hottest month in Maple Valley?
August, with a typical high of 77° and a low of 53°. About 5 days a year reach 90°.
How much snow does Maple Valley get?
About 18 inches in a normal winter, most of it in January.
When is the first frost in Maple Valley?
In half of years the first 32° night comes by October 25, and the last spring frost by April 20.
What is the rainiest month in Maple Valley?
November, with 7.5 inches of rain and melted snow. The year totals 52 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Maple Valley itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Palmer 3 Ese, WA (10 mi, snow) and Landsburg, WA (3 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.