West Pasco, WA climate
West Pasco has mild winters and warm summers, with very little rain. A typical July afternoon reaches 90°, a January night drops to 29°, and about 2 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in West Pasco feels like
Winter
Spring
Summer
Fall
West Pasco 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 | 41° | 29° | 1.1" | 0.2" | 14 | 0 | 22° – 42° |
| February | 48° | 30° | 0.7" | 0.2" | 10 | 1 | 25° – 44° |
| March | 58° | 35° | 0.7" | 0.1" | 10 | 0 | 36° – 51° |
| April | 65° | 40° | 0.7" | 0 | 9 | 0 | 48° – 58° |
| May | 74° | 47° | 0.8" | 0 | 8 | 0 | 56° – 66° |
| June | 81° | 54° | 0.6" | 0 | 6 | 0 | 63° – 75° |
| July | 90° | 59° | 0.2" | 0 | 3 | 0 | 67° – 79° |
| August | 89° | 58° | 0.2" | 0 | 2 | 0 | 68° – 76° |
| September | 80° | 50° | 0.3" | 0 | 4 | 0 | 62° – 68° |
| October | 65° | 41° | 0.7" | 0 | 8 | 0 | 48° – 58° |
| November | 50° | 33° | 0.9" | 0.1" | 12 | 0 | 36° – 47° |
| December | 40° | 28° | 1.1" | 1.4" | 13 | 1 | 27° – 39° |
| Year | 65° | 42° | 8.0" | 2.0" | 97 | 2 |
“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 West Pasco
West Pasco gets 8 inches of rain and melted snow a year. December is the wettest month and August the driest. Rain or snow falls on about 97 days a year.
About 200 frost-free days a year
In half of years the last 32° night comes by April 6 and the first one by October 24. That leaves about 200 frost-free days for gardens, longer than 72% of U.S. towns.
Heating and cooling a home in West Pasco
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In West Pasco, 86% of that work is heating and 14% 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.
West Pasco and its neighbors
West Pasco borders 1 town with climate data. January nights across them vary by 0.3°. Pasco has both the coldest January nights (29°) and the hottest July afternoons (90°). West Pasco’s January low is 29° and its July high 90°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How West Pasco 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 West Pasco averaged 1.0° warmer than the 1900s. The biggest change is in January (+3.6°). The shift is smaller than in 72% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at West Pasco’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. January swings the most: between 1991 and 2020 its average temperature ranged from 22° to 42°. September is the most reliable, staying within 7°.
Common questions about West Pasco’s climate
What is the coldest month in West Pasco?
December, with a typical high of 40° and a low of 28°.
What is the hottest month in West Pasco?
July, with a typical high of 90° and a low of 59°. About 39 days a year reach 90°.
How much snow does West Pasco get?
About 2 inches in a normal winter, most of it in December.
When is the first frost in West Pasco?
In half of years the first 32° night comes by October 24, and the last spring frost by April 6.
What is the rainiest month in West Pasco?
December, with 1.1 inches of rain and melted snow. The year totals 8 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for West Pasco itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Ice Harbor Dam, WA (15 mi, snow) and Richland, WA (6 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.