Photo: Tedder · CC BY 3.0Irrigon’s winters are milder and less snowy than most of the U.S.
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
Compared with towns across the U.S., with Irrigon’s place in Oregon beside it.
What a year in Irrigon feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
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. Frost and day counts come from NOAA’s station at Boardman, OR, 10 miles from the town’s center, at about the same height.
The 2023 USDA map puts Irrigon’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 6°. 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 4 inches of snow a winter
Snow, measured at Boardman, OR, falls mostly in February. Precipitation (rain plus melted snow) adds up to 8 inches a year; 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
Heating and cooling a home in Irrigon
85% of the work is heating. 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 Boardman, OR.
Living with Irrigon’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
188 frost-free days in zone 7b. 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.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 1.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Irrigon from natural hazards, river flooding is the largest share (62%); heat waves, cold waves, winter storms and ice storms together are 27%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Irrigon and similar climates
TownRatings has no climate map of the towns around Irrigon yet.
Climates most like Irrigon’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 |
|---|---|---|---|---|
| Irrigon, OR | 29° | 91° | 8" | 3.7" |
| Sparks, NV | 25° | 92° | 8" | 6.8" |
| Alamogordo, NM | 27° | 93° | 11" | 2.4" |
| Chino Valley, AZ | 27° | 92° | 11" | 10" |
| Alpine, TX | 30° | 90° | 15" | 2.2" |
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 Irrigon averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.6°).
A smaller shift than in 66% 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 Irrigon compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Irrigon’s place among Oregon’s.
Irrigon weather by month
Highs, lows and precipitation from NOAA’s grid at Irrigon’s center; snow, wet days and snow on the ground from Boardman, OR. 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" | 0.0" | 5 | 49° – 59° |
| May | 75° | 48° | 0.8" | 0.0" | 5 | 57° – 66° |
| June | 82° | 54° | 0.6" | 0.0" | 3 | 63° – 75° |
| July | 91° | 59° | 0.2" | 0.0" | 1 | 68° – 79° |
| August | 90° | 58° | 0.2" | 0.0" | 2 | 69° – 76° |
| September | 81° | 50° | 0.3" | 0.0" | 2 | 62° – 69° |
| October | 66° | 40° | 0.7" | 0.1" | 5 | 49° – 58° |
| November | 51° | 33° | 0.9" | 0.0" | 7 | 35° – 48° |
| December | 42° | 29° | 1.2" | 0.8" | 10 | 28° – 40° |
| Year | 66° | 42° | 8.2" | 3.7" | 62 |
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°.
Where Irrigon’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 Irrigon’s center.
- Snow: Boardman, OR.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Boardman, OR, 10 miles from the town’s center, at about the same height; 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 Irrigon’s climate
What is the weather like in Irrigon?
A typical July afternoon reaches 91°, a January night drops to 29°, and about 4 inches of snow falls in a normal winter. Milder January nights than 71% of U.S. towns; hotter July afternoons than 84% of U.S. towns.
How cold does it get in Irrigon in winter?
December nights average 29°. About 104 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 28°.
How much snow does Irrigon get?
About 3.7 inches in a normal winter at Boardman, OR, most of it in February.
How hot does it get in Irrigon?
July, with a typical high of 91° and a low of 59°. About 46 days a year reach 90° and 7 reach 100° (Boardman, OR).
When is the first and last frost in Irrigon?
In half of years the last spring frost (32°) comes by April 14 and the first fall frost by October 21, about 188 frost-free days, at Boardman, OR.
What growing zone is Irrigon in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 6°.
What is the best time of year to visit Irrigon?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Irrigon getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 66% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Irrigon.
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.