Photo: Visitor7 · CC BY-SA 3.0Grand Ronde sits near the top of U.S. towns for precipitation, with 74 inches a year
On a normal January night the air cools to about 36°. Summers stay cool: July afternoons here are cooler than in 93% of U.S. towns. The latest 30-year average runs 1.0° warmer than 1901–2000’s, with January up the most. The heating season runs November to April: each of those months averages under 50°.
A year in Grand Ronde at a glance
Each month’s typical high and low, and what it brings.
What stands out about Grand Ronde’s climate
Compared with towns across the U.S., with Grand Ronde’s place in Oregon beside it.
What a year in Grand Ronde feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 199 frost-free days a year
In half of years the last 32° night comes by April 16 and the first by November 1. Frost and day counts come from NOAA’s station at Dallas 2 Ne, OR, 18 miles from the town’s center, 190 ft lower.
The 2023 USDA map puts Grand Ronde’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 19°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 2 inches of snow a winter
Snow, measured at Willamina, OR, falls mostly in December. Precipitation (rain plus melted snow) adds up to 74 inches a year; December is the wettest month and July the driest. Rain or snow falls on about 153 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Grand Ronde
94% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Dallas 2 Ne, OR.
Living with Grand Ronde’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
199 frost-free days in zone 8b. The last frost comes by Apr 16 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 1.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 20 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Grand Ronde from natural hazards, river flooding is the largest share (57%); heat waves, cold waves, winter storms and ice storms together are 5%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Grand Ronde and similar climates
TownRatings has no climate map of the towns around Grand Ronde yet.
Climates most like Grand Ronde’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Grand Ronde, OR | 36° | 80° | 74" | 1.7" |
| Sultan, WA | 35° | 76° | 75" | 3.0" |
| Brevard, NC | 27° | 83° | 69" | 7.1" |
| Signal Mountain, TN | 29° | 85° | 62" | 4.3" |
| Fort Payne, AL | 31° | 86° | 60" | 5.0" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
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°).
A smaller shift than in 77% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Grand Ronde compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Grand Ronde’s place among Oregon’s.
Grand Ronde weather by month
Highs, lows and precipitation from NOAA’s grid at Grand Ronde’s center; snow, wet days and snow on the ground from Willamina, OR. 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" | 0.0" | 18 | 0 | 42° – 53° |
| April | 60° | 40° | 6.1" | 0.0" | 16 | 0 | 45° – 56° |
| May | 67° | 44° | 3.5" | 0.0" | 11 | 0 | 51° – 60° |
| June | 72° | 48° | 2.2" | 0.0" | 8 | 0 | 57° – 66° |
| July | 80° | 51° | 0.5" | 0.0" | 2 | 0 | 60° – 69° |
| August | 80° | 51° | 0.7" | 0.0" | 3 | 0 | 63° – 70° |
| September | 75° | 48° | 2.3" | 0.0" | 7 | 0 | 58° – 65° |
| October | 63° | 43° | 6.4" | 0.0" | 13 | 0 | 49° – 58° |
| November | 52° | 39° | 11.2" | 0.0" | 19 | 0 | 39° – 50° |
| December | 46° | 35° | 12.8" | 1.0" | 20 | 0 | 36° – 43° |
| Year | 62° | 42° | 73.9" | 1.7" | 153 | 1 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 36° to 49°. September is the most reliable, staying within 7°.
Where Grand Ronde’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Grand Ronde’s center.
- Snow: Willamina, OR.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Dallas 2 Ne, OR, 18 miles from the town’s center, 190 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Grand Ronde’s climate
What is the weather like in Grand Ronde?
A typical July afternoon reaches 80°, a January night drops to 36°, and about 2 inches of snow falls in a normal winter. Milder January nights than 83% of U.S. towns; cooler July afternoons than 93% of U.S. towns.
How cold does it get in Grand Ronde in winter?
December nights average 35°. About 49 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 36°.
How much snow does Grand Ronde get?
About 1.7 inches in a normal winter at Willamina, OR, most of it in December, with snow on the ground about 1 days a year.
How hot does it get in Grand Ronde?
July, with a typical high of 80° and a low of 51°. About 17 days a year reach 90° and 1 reach 100° (Dallas 2 Ne, OR).
When is the first and last frost in Grand Ronde?
In half of years the last spring frost (32°) comes by April 16 and the first fall frost by November 1, about 199 frost-free days, at Dallas 2 Ne, OR.
What growing zone is Grand Ronde in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 19°.
What is the best time of year to visit Grand Ronde?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Grand Ronde getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 77% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Grand Ronde.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.