Glen Ullin’s winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 83°, a January night drops to 3°, and about 41 inches of snow falls in a normal winter.
A year in Glen Ullin at a glance
Each month’s typical high and low, and what it brings.
What stands out about Glen Ullin’s climate
Compared with towns across the U.S., with Glen Ullin’s place in North Dakota beside it.
What a year in Glen Ullin feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 123 frost-free days a year
In half of years the last 32° night comes by May 19 and the first by September 21. Frost and day counts come from NOAA’s station at Hebron, ND, 12 miles from the town’s center, at about the same height.
The 2023 USDA map puts Glen Ullin’s center in zone 4a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −27°. 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 41 inches of snow a winter
Snow, measured at Hebron, ND, falls mostly in March and December. Precipitation (rain plus melted snow) adds up to 17 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 80 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Glen Ullin
96% 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 Hebron, ND.
Living with Glen Ullin’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
123 frost-free days in zone 4a. The last frost comes by May 19 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 21.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September.
Parks & trails →Of the yearly building losses FEMA expects in Glen Ullin from natural hazards, hail is the largest share (29%); heat waves, cold waves, winter storms and ice storms together are 34%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Glen Ullin and similar climates
TownRatings has no climate map of the towns around Glen Ullin yet.
Climates most like Glen Ullin’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 |
|---|---|---|---|---|
| Glen Ullin, ND | 3° | 83° | 17" | 41" |
| Aberdeen, SD | 3° | 84° | 22" | 43" |
| Havre, MT | 6° | 85° | 13" | 41" |
| Gunnison, CO | 0° | 82° | 12" | 50" |
| Moorhead, MN | 0° | 82° | 25" | 51" |
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 Glen Ullin averaged 1.2° warmer than the 1900s. The biggest change is in January (+4.0°).
A smaller shift than in 59% 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 Glen Ullin compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Glen Ullin’s place among North Dakota’s.
Glen Ullin weather by month
Highs, lows and precipitation from NOAA’s grid at Glen Ullin’s center; snow, wet days and snow on the ground from Hebron, ND. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 24° | 3° | 0.4" | 5.2" | 4 | 2° – 28° |
| February | 28° | 7° | 0.5" | 6.2" | 4 | −2° – 31° |
| March | 41° | 18° | 0.7" | 7.4" | 5 | 17° – 43° |
| April | 55° | 29° | 1.4" | 4.0" | 7 | 35° – 49° |
| May | 67° | 40° | 2.4" | 0.8" | 11 | 49° – 59° |
| June | 76° | 50° | 3.3" | 0.0" | 11 | 59° – 67° |
| July | 83° | 56° | 2.5" | 0.0" | 9 | 62° – 76° |
| August | 83° | 54° | 2.1" | 0.0" | 7 | 63° – 74° |
| September | 73° | 44° | 1.7" | 0.2" | 7 | 53° – 64° |
| October | 56° | 31° | 1.4" | 2.5" | 6 | 36° – 49° |
| November | 40° | 18° | 0.6" | 6.6" | 4 | 16° – 39° |
| December | 28° | 8° | 0.5" | 7.7" | 5 | 6° – 27° |
| Year | 54° | 30° | 17.4" | 40.6" | 80 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from -2° to 31°. June is the most reliable, staying within 9°.
Where Glen Ullin’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 Glen Ullin’s center.
- Snow: Hebron, ND.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hebron, ND, 12 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 Glen Ullin’s climate
What is the weather like in Glen Ullin?
A typical July afternoon reaches 83°, a January night drops to 3°, and about 41 inches of snow falls in a normal winter. Colder January nights than all but 118 U.S. towns; cooler July afternoons than 66% of U.S. towns.
How cold does it get in Glen Ullin in winter?
January nights average 3°. About 194 nights a year reach 32° or below and 38 reach 0° or below. In the coldest January of the last 30 years the month averaged 2°.
How much snow does Glen Ullin get?
About 41 inches in a normal winter at Hebron, ND, most of it in March and December.
How hot does it get in Glen Ullin?
July, with a typical high of 83° and a low of 56°. About 15 days a year reach 90° and 1 reach 100° (Hebron, ND).
When is the first and last frost in Glen Ullin?
In half of years the last spring frost (32°) comes by May 19 and the first fall frost by September 21, about 123 frost-free days, at Hebron, ND.
What growing zone is Glen Ullin in?
Zone 4a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −27°.
What is the best time of year to visit Glen Ullin?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Glen Ullin getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 59% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Glen Ullin.
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.