Coram gets about 115 inches of snow a winter, more than all but 170 U.S. towns
July afternoons average 81°. Summers stay cool: July afternoons here are cooler than in 89% of U.S. towns. The latest 30-year average runs 1.7° warmer than 1901–2000’s, with January up the most. The outdoor season runs from June to August, with highs of 70–81°.
A year in Coram at a glance
Each month’s typical high and low, and what it brings.
What stands out about Coram’s climate
Compared with towns across the U.S., with Coram’s place in Montana beside it.
What a year in Coram feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 141 frost-free days a year
In half of years the last 32° night comes by May 9 and the first by October 1. Frost and day counts come from NOAA’s station at Hungry Horse Dam, MT, 6 miles from the town’s center, at about the same height.
The 2023 USDA map puts Coram’s center in zone 5b: 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 115 inches of snow a winter
Snow, measured at W Glacier, MT, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 24 inches a year; June is the wettest month and August the driest. Rain or snow falls on about 162 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Coram
96% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from September 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 Hungry Horse Dam, MT.
Living with Coram’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
141 frost-free days in zone 5b. The last frost comes by May 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 Oct 1.
Months with highs of 62–84° and lows of 40° or more: June, July and August.
Parks & trails →Of the yearly building losses FEMA expects in Coram from natural hazards, avalanches are the largest share (78%); heat waves, cold waves, winter storms and ice storms together are 4%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Coram and similar climates
TownRatings has no climate map of the towns around Coram yet.
Climates most like Coram’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 |
|---|---|---|---|---|
| Coram, MT | 18° | 81° | 24" | 115" |
| Black Forest, CO | 16° | 81° | 20" | 121" |
| Park City, UT | 18° | 81° | 23" | 153" |
| Traverse City, MI | 17° | 79° | 32" | 101" |
| Parma, NY | 18° | 81° | 34" | 102" |
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 Coram averaged 1.7° warmer than the 1900s. The biggest change is in January (+4.2°).
A bigger shift than in 71% 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 Coram compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Coram’s place among Montana’s.
Coram weather by month
Highs, lows and precipitation from NOAA’s grid at Coram’s center; snow, wet days and snow on the ground from W Glacier, MT. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 31° | 18° | 2.3" | 32.0" | 18 | 31 | 16° – 32° |
| February | 35° | 18° | 1.5" | 16.0" | 15 | 29 | 13° – 34° |
| March | 44° | 24° | 1.7" | 14.0" | 15 | 30 | 25° – 40° |
| April | 54° | 31° | 1.8" | 3.1" | 14 | 14 | 37° – 49° |
| May | 64° | 38° | 2.2" | 0.5" | 14 | 1 | 46° – 56° |
| June | 70° | 45° | 3.3" | 0.0" | 15 | 0 | 54° – 65° |
| July | 81° | 49° | 1.3" | 0.0" | 9 | 0 | 56° – 72° |
| August | 80° | 47° | 1.1" | 0.0" | 7 | 0 | 59° – 67° |
| September | 69° | 40° | 1.7" | 0.0" | 10 | 0 | 51° – 59° |
| October | 53° | 31° | 2.2" | 2.0" | 14 | 2 | 37° – 48° |
| November | 39° | 25° | 2.4" | 16.2" | 16 | 13 | 24° – 38° |
| December | 31° | 19° | 2.2" | 31.4" | 18 | 28 | 17° – 31° |
| Year | 54° | 32° | 23.7" | 115.2" | 162 | 147 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 13° to 34°. August is the most reliable, staying within 8°.
Where Coram’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 Coram’s center.
- Snow: W Glacier, MT.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hungry Horse Dam, MT, 6 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 Coram’s climate
What is the weather like in Coram?
A typical July afternoon reaches 81°, a January night drops to 18°, and about 115 inches of snow falls in a normal winter. Colder January nights than 72% of U.S. towns; cooler July afternoons than 89% of U.S. towns.
How cold does it get in Coram in winter?
January nights average 18°. About 169 nights a year reach 32° or below and 10 reach 0° or below. In the coldest January of the last 30 years the month averaged 16°.
How much snow does Coram get?
About 115 inches in a normal winter at W Glacier, MT, most of it in January and December, with snow on the ground about 147 days a year.
How hot does it get in Coram?
July, with a typical high of 81° and a low of 49°. About 16 days a year reach 90° (Hungry Horse Dam, MT).
When is the first and last frost in Coram?
In half of years the last spring frost (32°) comes by May 9 and the first fall frost by October 1, about 141 frost-free days, at Hungry Horse Dam, MT.
What growing zone is Coram in?
Zone 5b 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 Coram?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July and August. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Coram getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 71% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Coram.
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.