Irrigon has mild winters and warm summers, with very little rain
A typical July afternoon reaches 91°, a January night drops to 29°, and about 4 inches of snow falls in a normal winter.
A year in Irrigon at a glance
Each month’s typical high and low, and what it brings.
What stands out about Irrigon’s climate
Read from where Irrigon sits among Oregon’s towns. The page puts what stands out first.
4 inches of snow, 8 of rain and melt
December is the wettest month and July the driest. Rain or snow falls on about 62 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
About 188 frost-free days a year
In half of years the last 32° night comes by April 14 and the first by October 21.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
What a year in Irrigon feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Living with Irrigon’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
188 frost-free days. The last frost comes by Apr 14 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 21.
About 4" in a normal winter.
Months averaging under 55° run from October through April. Heating is 85% of the year’s heating-and-cooling load.
About 46 days a year reach 90°, and July afternoons average 91°.
The nicest months are April, May, June, September and October. 1.0 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 →Warmer than it used to be
The last 30 years in Irrigon averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.6°).
A smaller shift than in 56% of U.S. towns.
Change by month
How Irrigon compares
Against every U.S. town on TownTapestry, each counted once, with its place in Oregon.
Irrigon 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 42° | 29° | 1.1" | 1.2" | 9 | 23° – 41° |
| February | 49° | 30° | 0.8" | 1.4" | 6 | 28° – 44° |
| March | 58° | 35° | 0.8" | 0.2" | 6 | 38° – 50° |
| April | 66° | 40° | 0.7" | 0 | 5 | 49° – 59° |
| May | 75° | 48° | 0.8" | 0 | 5 | 57° – 66° |
| June | 82° | 54° | 0.6" | 0 | 3 | 63° – 75° |
| July | 91° | 59° | 0.2" | 0 | 1 | 68° – 79° |
| August | 90° | 58° | 0.2" | 0 | 2 | 69° – 76° |
| September | 81° | 50° | 0.3" | 0 | 2 | 62° – 69° |
| October | 66° | 40° | 0.7" | 0.1" | 5 | 49° – 58° |
| November | 51° | 33° | 0.9" | 0 | 7 | 35° – 48° |
| December | 42° | 29° | 1.2" | 0.8" | 10 | 28° – 40° |
| Year | 66° | 42° | 8.2" | 3.7" | 62 |
Heating and cooling a home in Irrigon
85% 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. January swings the most: from 1991 to 2020 its average ranged from 23° to 41°. September is the most reliable, staying within 6°.
Common questions about Irrigon’s climate
What is the coldest month in Irrigon?
December, with a typical high of 42° and a low of 29°.
What is the hottest month in Irrigon?
July, with a typical high of 91° and a low of 59°. About 46 days a year reach 90°.
How much snow does Irrigon get?
About 4 inches in a normal winter, most of it in February.
When is the first frost in Irrigon?
In half of years the first 32° night comes by October 21, and the last spring frost by April 14.
What is the rainiest month in Irrigon?
December, with 1.2 inches of rain and melted snow. The year totals 8 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Irrigon.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Irrigon itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Boardman, OR (10 mi) away. 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.