Altamont’s winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 86°, a January night drops to 22°, and about 52 inches of snow falls in a normal winter.
A year in Altamont at a glance
Each month’s typical high and low, and what it brings.
What stands out about Altamont’s climate
Compared with towns across the U.S., with Altamont’s place in Oregon beside it.
What a year in Altamont feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 99 frost-free days a year
In half of years the last 32° night comes by June 9 and the first by September 18. Frost and day counts come from NOAA’s station at Klamath Falls International Airport, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Altamont’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −2°. 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 52 inches of snow a winter
Snow, measured at Keno, OR, falls mostly in December. Precipitation (rain plus melted snow) adds up to 13 inches a year; December is the wettest month and July the driest. Rain or snow falls on about 93 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Altamont
97% 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 Klamath Falls International Airport.
Living with Altamont’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
99 frost-free days in zone 6b. The last frost comes by Jun 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 Sep 18.
Months with highs of 62–84° and lows of 40° or more: June. 0.5 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Altamont from natural hazards, river flooding is the largest share (48%); heat waves, cold waves, winter storms and ice storms together are 15%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Altamont and similar climates
TownRatings has no climate map of the towns around Altamont yet.
Climates most like Altamont’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 |
|---|---|---|---|---|
| Altamont, OR | 22° | 86° | 13" | 52" |
| Suncrest, WA | 23° | 87° | 16" | 48" |
| Castle Pines, CO | 19° | 86° | 17" | 58" |
| Orchard Homes, MT | 18° | 86° | 13" | 43" |
| Los Alamos, NM | 19° | 85° | 15" | 42" |
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 Altamont averaged 1.7° warmer than the 1900s. The biggest change is in January (+3.1°).
A bigger shift than in 72% 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 Altamont compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Altamont’s place among Oregon’s.
Altamont weather by month
Highs, lows and precipitation from NOAA’s grid at Altamont’s center; snow, wet days and snow on the ground from Keno, OR. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 42° | 22° | 1.9" | 12.1" | 13 | 11 | 24° – 39° |
| February | 46° | 23° | 1.4" | 10.6" | 10 | 8 | 28° – 41° |
| March | 52° | 27° | 1.4" | 5.8" | 11 | 4 | 34° – 45° |
| April | 58° | 30° | 1.2" | 1.9" | 10 | 1 | 40° – 49° |
| May | 68° | 37° | 1.2" | 0.2" | 9 | 0 | 46° – 60° |
| June | 76° | 42° | 0.7" | 0.0" | 5 | 0 | 55° – 66° |
| July | 86° | 48° | 0.2" | 0.0" | 2 | 0 | 58° – 71° |
| August | 86° | 46° | 0.3" | 0.0" | 3 | 0 | 62° – 70° |
| September | 78° | 40° | 0.4" | 0.0" | 3 | 0 | 55° – 64° |
| October | 65° | 32° | 0.9" | 0.3" | 6 | 0 | 44° – 53° |
| November | 49° | 26° | 1.7" | 6.6" | 11 | 4 | 28° – 43° |
| December | 41° | 21° | 2.2" | 14.7" | 12 | 12 | 25° – 36° |
| Year | 62° | 33° | 13.4" | 52.2" | 93 | 40 |
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 39°. August is the most reliable, staying within 8°.
Where Altamont’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 Altamont’s center.
- Snow: Keno, OR.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Klamath Falls International Airport, 4 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 Altamont’s climate
What is the weather like in Altamont?
A typical July afternoon reaches 86°, a January night drops to 22°, and about 52 inches of snow falls in a normal winter. Colder January nights than 52% of U.S. towns; hotter July afternoons than 56% of U.S. towns.
How cold does it get in Altamont in winter?
December nights average 21°. About 184 nights a year reach 32° or below and 2 reach 0° or below. In the coldest December of the last 30 years the month averaged 25°.
How much snow does Altamont get?
About 52 inches in a normal winter at Keno, OR, most of it in December, with snow on the ground about 40 days a year.
How hot does it get in Altamont?
July, with a typical high of 86° and a low of 48°. About 18 days a year reach 90° (Klamath Falls International Airport).
When is the first and last frost in Altamont?
In half of years the last spring frost (32°) comes by June 9 and the first fall frost by September 18, about 99 frost-free days, at Klamath Falls International Airport.
What growing zone is Altamont in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −2°.
What is the best time of year to visit Altamont?
By one simple rule (highs of 62–84° and lows of 40° or more), June. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Altamont getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 72% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Altamont.
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.