Marion Forks Guard Station · Photo: 46percent · Public domainIdanha gets about 85 inches of snow a winter, more than 96% of U.S. towns
High summer brings afternoon highs near 81°. Precipitation is plentiful here, more than falls on almost every U.S. town. January has warmed most since 1901–2000, part of a 1.0° rise. The frost-free window for a garden runs roughly March 9 to December 3.
A year in Idanha at a glance
Each month’s typical high and low, and what it brings.
What stands out about Idanha’s climate
Compared with towns across the U.S., with Idanha’s place in Oregon beside it.
What a year in Idanha feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 270 frost-free days a year
In half of years the last 32° night comes by March 9 and the first by December 3. Frost and day counts come from Detroit Dam, OR, 9 miles away.
The 2023 USDA map puts Idanha’s center in zone 8a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 15°. 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 85 inches of snow a winter
Snow, measured at Marion Forks Fish Hatchery, OR, falls mostly in January. Precipitation (rain plus melted snow) adds up to 82 inches a year; December is the wettest month and July the driest. Rain or snow falls on about 165 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Idanha
93% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Detroit Dam, OR.
Living with Idanha’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
270 frost-free days in zone 8a. The last frost comes by Mar 9 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Dec 3.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September.
Parks & trails →Of the yearly building losses FEMA expects in Idanha from natural hazards, river flooding is the largest share (74%); heat waves, cold waves, winter storms and ice storms together are 4%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Idanha and similar climates
TownRatings has no climate map of the towns around Idanha yet.
Climates most like Idanha’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 |
|---|---|---|---|---|
| Idanha, OR | 30° | 81° | 82" | 85" |
| Boone, NC | 24° | 79° | 58" | 26" |
| Fallsburg, NY | 15° | 81° | 53" | 70" |
| Scituate, RI | 19° | 82° | 51" | 62" |
| New Hartford, CT | 16° | 83° | 53" | 59" |
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 Idanha averaged 1.0° warmer than the 1900s. The biggest change is in January (+2.8°).
A smaller shift than in 75% 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 Idanha compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Idanha’s place among Oregon’s.
Idanha weather by month
Highs, lows and precipitation from NOAA’s grid at Idanha’s center; snow, wet days and snow on the ground from Marion Forks Fish Hatchery, OR. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 42° | 30° | 11.4" | 24.3" | 19 | 20 | 31° – 41° |
| February | 45° | 30° | 8.6" | 17.5" | 16 | 19 | 31° – 44° |
| March | 50° | 31° | 9.4" | 13.0" | 20 | 15 | 37° – 47° |
| April | 56° | 34° | 7.4" | 2.9" | 18 | 4 | 40° – 51° |
| May | 64° | 40° | 5.2" | 0.2" | 15 | 0 | 45° – 58° |
| June | 70° | 44° | 3.4" | 0.0" | 11 | 0 | 53° – 65° |
| July | 81° | 49° | 0.8" | 0.0" | 4 | 0 | 57° – 68° |
| August | 80° | 48° | 1.0" | 0.0" | 4 | 0 | 60° – 68° |
| September | 73° | 43° | 3.0" | 0.0" | 7 | 0 | 55° – 62° |
| October | 59° | 37° | 7.2" | 0.1" | 14 | 0 | 44° – 54° |
| November | 47° | 33° | 11.5" | 7.6" | 19 | 6 | 33° – 44° |
| December | 40° | 29° | 13.3" | 19.6" | 19 | 17 | 30° – 38° |
| Year | 59° | 37° | 82.3" | 85.2" | 165 | 80 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 45° to 58°. September is the most reliable, staying within 7°.
Where Idanha’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 Idanha’s center.
- Snow: Marion Forks Fish Hatchery, OR.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Detroit Dam, OR, 9 miles from the town’s center, 580 ft lower; 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 Idanha’s climate
What is the weather like in Idanha?
A typical July afternoon reaches 81°, a January night drops to 30°, and about 85 inches of snow falls in a normal winter. Milder January nights than 72% of U.S. towns; cooler July afternoons than 90% of U.S. towns.
How cold does it get in Idanha in winter?
December nights average 29°. About 46 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 30°.
How much snow does Idanha get?
About 85 inches in a normal winter at Marion Forks Fish Hatchery, OR, most of it in January, with snow on the ground about 80 days a year.
How hot does it get in Idanha?
July, with a typical high of 81° and a low of 49°. About 13 days a year reach 90° (Detroit Dam, OR).
When is the first and last frost in Idanha?
In half of years the last spring frost (32°) comes by March 9 and the first fall frost by December 3, about 270 frost-free days, at Detroit Dam, OR.
What growing zone is Idanha in?
Zone 8a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 15°.
What is the best time of year to visit Idanha?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Idanha getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 75% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Idanha.
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.