Grand Ronde, OR climate
Grand Ronde has mild winters and pleasant summers, with plenty of rain. A typical July afternoon reaches 80°, a January night drops to 36°, and about 2 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Grand Ronde feels like
Winter
Spring
Summer
Fall
Grand Ronde 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° | 11.3" | 0.2" | 20 | 0 | 36° – 47° |
| February | 51° | 36° | 8.5" | 0.5" | 16 | 0 | 36° – 49° |
| March | 55° | 37° | 8.5" | 0 | 18 | 0 | 42° – 53° |
| April | 60° | 40° | 6.1" | 0 | 16 | 0 | 45° – 56° |
| May | 67° | 44° | 3.5" | 0 | 11 | 0 | 51° – 60° |
| June | 72° | 48° | 2.2" | 0 | 8 | 0 | 57° – 66° |
| July | 80° | 51° | 0.5" | 0 | 2 | 0 | 60° – 69° |
| August | 80° | 51° | 0.7" | 0 | 3 | 0 | 63° – 70° |
| September | 75° | 48° | 2.3" | 0 | 7 | 0 | 58° – 65° |
| October | 63° | 43° | 6.4" | 0 | 13 | 0 | 49° – 58° |
| November | 52° | 39° | 11.2" | 0 | 19 | 0 | 39° – 50° |
| December | 46° | 35° | 12.8" | 1.0" | 20 | 0 | 36° – 43° |
| Year | 62° | 42° | 73.9" | 1.7" | 153 | 1 |
“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 Grand Ronde
Grand Ronde gets 74 inches of rain and melted snow a year. December is the wettest month and July the driest. Rain or snow falls on about 153 days a year.
About 199 frost-free days a year
In half of years the last 32° night comes by April 16 and the first one by November 1. That leaves about 199 frost-free days for gardens, longer than 72% of U.S. towns.
Heating and cooling a home in Grand Ronde
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Grand Ronde, 94% of that work is heating and 6% 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.
How Grand Ronde 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 Grand Ronde averaged 1.0° warmer than the 1900s. The biggest change is in January (+2.6°). The shift is smaller than in 69% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Grand Ronde’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 36° to 49°. September is the most reliable, staying within 7°.
Common questions about Grand Ronde’s climate
What is the coldest month in Grand Ronde?
December, with a typical high of 46° and a low of 35°.
What is the hottest month in Grand Ronde?
August, with a typical high of 80° and a low of 51°. About 17 days a year reach 90°.
How much snow does Grand Ronde get?
About 2 inches in a normal winter, most of it in December.
When is the first frost in Grand Ronde?
In half of years the first 32° night comes by November 1, and the last spring frost by April 16.
What is the rainiest month in Grand Ronde?
December, with 12.8 inches of rain and melted snow. The year totals 74 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Grand Ronde itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Willamina, OR (7 mi, snow) and Dallas 2 Ne, OR (18 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.