Photo: Sam Beebe/Ecotrust · CC BY-SA 3.0Few U.S. towns get less rain and snow than Ione: 11 inches a year
Sunny July days climb to about 89°. In July, afternoons here are warmer than in 72% of U.S. towns. January has warmed most since 1901–2000, part of a 1.7° rise. Plan time outside for May, June and September, when highs sit at 72–79°.
A year in Ione at a glance
Each month’s typical high and low, and what it brings.
What stands out about Ione’s climate
Compared with towns across the U.S., with Ione’s place in Oregon beside it.
What a year in Ione feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 174 frost-free days a year
In half of years the last 32° night comes by April 26 and the first by October 19. Frost and day counts come from Heppner, OR, 16 miles away.
The 2023 USDA map puts Ione’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 5°. 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 13 inches of snow a winter
Snow, measured at Heppner, OR, falls mostly in December. Precipitation (rain plus melted snow) adds up to 11 inches a year; December is the wettest month and August the driest. Rain or snow falls on about 102 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Ione
91% 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 Heppner, OR.
Living with Ione’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
174 frost-free days in zone 7b. The last frost comes by Apr 26 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 19.
Months with highs of 62–84° and lows of 40° or more: May, June and September.
Parks & trails →Of the yearly building losses FEMA expects in Ione from natural hazards, river flooding is the largest share (49%); heat waves, cold waves, winter storms and ice storms together are 8%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Ione and similar climates
TownRatings has no climate map of the towns around Ione yet.
Climates most like Ione’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 |
|---|---|---|---|---|
| Ione, OR | 29° | 89° | 11" | 13" |
| Williamson, AZ | 26° | 91° | 13" | 10" |
| Silver City, NM | 26° | 87° | 16" | 13" |
| Cold Springs, NV | 23° | 88° | 13" | 17" |
| Kimberly, ID | 22° | 90° | 10" | 24" |
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 Ione averaged 1.7° warmer than the 1900s. The biggest change is in January (+4.2°).
A bigger shift than in 70% 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 Ione compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Ione’s place among Oregon’s.
Ione weather by month
Highs, lows and precipitation from NOAA’s grid at Ione’s center; snow, wet days and snow on the ground from Heppner, OR. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 42° | 29° | 1.3" | 3.0" | 11 | 5 | 24° – 41° |
| February | 48° | 30° | 0.9" | 3.4" | 10 | 3 | 29° – 45° |
| March | 55° | 34° | 0.9" | 0.9" | 12 | 1 | 36° – 50° |
| April | 63° | 38° | 1.0" | 0.1" | 11 | 0 | 46° – 56° |
| May | 72° | 45° | 1.3" | 0.0" | 10 | 0 | 53° – 63° |
| June | 79° | 51° | 0.9" | 0.0" | 7 | 0 | 60° – 73° |
| July | 89° | 57° | 0.3" | 0.0" | 3 | 0 | 65° – 77° |
| August | 88° | 56° | 0.2" | 0.0" | 2 | 0 | 67° – 75° |
| September | 79° | 49° | 0.3" | 0.0" | 4 | 0 | 60° – 67° |
| October | 65° | 39° | 0.9" | 0.2" | 9 | 0 | 47° – 58° |
| November | 50° | 33° | 1.3" | 0.9" | 12 | 1 | 35° – 47° |
| December | 41° | 28° | 1.4" | 4.3" | 12 | 4 | 28° – 38° |
| Year | 64° | 41° | 10.5" | 12.8" | 102 | 15 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 24° to 41°. September is the most reliable, staying within 7°.
Where Ione’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 Ione’s center.
- Snow: Heppner, OR.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Heppner, OR, 16 miles from the town’s center, 760 ft higher; no station nearby passes every check; this is the nearest one in the same valley, flagged above.
- 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 Ione’s climate
What is the weather like in Ione?
A typical July afternoon reaches 89°, a January night drops to 29°, and about 13 inches of snow falls in a normal winter. Milder January nights than 71% of U.S. towns; hotter July afternoons than 72% of U.S. towns.
How cold does it get in Ione in winter?
December nights average 28°. About 106 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 28°.
How much snow does Ione get?
About 13 inches in a normal winter at Heppner, OR, most of it in December, with snow on the ground about 15 days a year.
How hot does it get in Ione?
July, with a typical high of 89° and a low of 57°. About 28 days a year reach 90° and 2 reach 100° (Heppner, OR).
When is the first and last frost in Ione?
In half of years the last spring frost (32°) comes by April 26 and the first fall frost by October 19, about 174 frost-free days, at Heppner, OR.
What growing zone is Ione in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 5°.
What is the best time of year to visit Ione?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Ione getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 70% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Ione.
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.