Photo: Andrew Filer · CC BY-SA 2.0Grenora’s winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 82°, a January night drops to 0°, and about 37 inches of snow falls in a normal winter.
A year in Grenora at a glance
Each month’s typical high and low, and what it brings.
What stands out about Grenora’s climate
Compared with towns across the U.S., with Grenora’s place in North Dakota beside it.
What a year in Grenora feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 125 frost-free days a year
In half of years the last 32° night comes by May 18 and the first by September 21. Frost and day counts come from NOAA’s station at Westby, MT, 18 miles from the town’s center, at about the same height.
The 2023 USDA map puts Grenora’s center in zone 3b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −31°. 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 37 inches of snow a winter
Snow, measured at Fortuna 1 W, ND, falls mostly in January, March and December. Precipitation (rain plus melted snow) adds up to 15 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 48 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Grenora
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 Westby, MT.
Living with Grenora’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
125 frost-free days in zone 3b. The last frost comes by May 18 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: June, July, August and September. 0.5 miles of trails are waiting.
Parks & trails →Cold waves are 36% of the yearly building losses FEMA expects in Grenora from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Grenora and its neighbors
Every town next door is within a degree of Grenora in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Grenora’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 |
|---|---|---|---|---|
| Grenora, ND | 0° | 82° | 15" | 37" |
| Gunnison, CO | 0° | 82° | 12" | 50" |
| Aberdeen, SD | 3° | 84° | 22" | 43" |
| East Grand Forks, MN | −2° | 81° | 23" | 49" |
| Havre, MT | 6° | 85° | 13" | 41" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Grenora averaged 1.6° warmer than the 1900s. The biggest change is in January (+4.5°).
A bigger shift than in 67% 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 Grenora compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Grenora’s place among North Dakota’s.
Grenora weather by month
Highs, lows and precipitation from NOAA’s grid at Grenora’s center; snow, wet days and snow on the ground from Fortuna 1 W, ND. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 20° | 0° | 0.4" | 6.6" | 2 | −2° – 26° |
| February | 25° | 4° | 0.3" | 5.7" | 2 | −6° – 29° |
| March | 39° | 16° | 0.6" | 7.0" | 3 | 13° – 40° |
| April | 55° | 28° | 1.1" | 3.4" | 3 | 32° – 48° |
| May | 67° | 40° | 2.3" | 0.9" | 6 | 49° – 59° |
| June | 75° | 49° | 3.1" | 0.0" | 10 | 57° – 68° |
| July | 82° | 55° | 2.2" | 0.0" | 7 | 61° – 74° |
| August | 82° | 52° | 1.4" | 0.0" | 5 | 61° – 73° |
| September | 71° | 42° | 1.3" | 0.0" | 3 | 52° – 63° |
| October | 55° | 29° | 1.0" | 2.2" | 3 | 33° – 47° |
| November | 36° | 16° | 0.4" | 4.3" | 2 | 13° – 38° |
| December | 24° | 5° | 0.6" | 6.4" | 3 | 3° – 25° |
| Year | 53° | 28° | 14.9" | 36.5" | 48 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from -6° to 29°. June is the most reliable, staying within 11°.
Where Grenora’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 Grenora’s center.
- Snow: Fortuna 1 W, ND.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Westby, MT, 18 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 Grenora’s climate
What is the weather like in Grenora?
A typical July afternoon reaches 82°, a January night drops to 0°, and about 37 inches of snow falls in a normal winter. Colder January nights than all but 47 U.S. towns; cooler July afternoons than 79% of U.S. towns.
How cold does it get in Grenora in winter?
January nights average 0°. About 202 nights a year reach 32° or below and 49 reach 0° or below. In the coldest January of the last 30 years the month averaged −2°.
How much snow does Grenora get?
About 37 inches in a normal winter at Fortuna 1 W, ND, most of it in January, March and December.
How hot does it get in Grenora?
July, with a typical high of 82° and a low of 55°. About 10 days a year reach 90° (Westby, MT).
When is the first and last frost in Grenora?
In half of years the last spring frost (32°) comes by May 18 and the first fall frost by September 21, about 125 frost-free days, at Westby, MT.
What growing zone is Grenora in?
Zone 3b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −31°.
What is the best time of year to visit Grenora?
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 Grenora getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 67% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Grenora.
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.