Grassy Butte (2 mi ENE), North Dakota climate: Climate normals at a NOAA weather station
Grassy Butte (2 mi ENE)'s normal year runs from 6°F January nights to 83°F July afternoons, with 17.7 inches of precipitation and 42 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.8°C, January lows of −14°C, July highs of 28°C, 449 mm of precipitation a year.
- NOAA stationGrassy Butte (2 mi ENE)
- Station IDUSC00323705
- Location47.40°N 103.21°W
- Elevation2,670 ft (814 m)
On October 23, the normal high in Grassy Butte (2 mi ENE) is 50°F and the normal low 29°F, and the chance of measurable rain or snow is 23%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Grassy Butte (2 mi ENE).
- Jan 24° 6°
- Feb 28° 10°
- Mar 41° 19°
- Apr 55° 30°
- May 66° 40°
- Jun 75° 50°
- Jul 83° 55°
- Aug 83° 54°
- Sep 72° 45°
- Oct 55° 33°
- Nov 39° 20°
- Dec 27° 10°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Grassy Butte (2 mi ENE) each month?
July is the warmest month, with normal highs of 83°F; January the coldest, with normal lows of 6°F. The most precipitation falls in June (3.28 in), the least in February (0.44 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 24°F | 6°F | 15.0°F | 0.45 | 5.8 | 7 | <1 | 30 | 8 h 50 min |
| February | 28°F | 10°F | 18.7°F | 0.44 | 6.9 | 7 | <1 | 27 | 10 h 10 min |
| March | 41°F | 19°F | 30.1°F | 0.71 | 5.4 | 7 | <1 | 27 | 11 h 50 min |
| April | 55°F | 30°F | 42.5°F | 1.35 | 4.4 | 8 | <1 | 18 | 13 h 30 min |
| May | 66°F | 40°F | 53.3°F | 2.79 | 1.3 | 11 | <1 | 6 | 15 h |
| June | 75°F | 50°F | 62.1°F | 3.28 | 0.0 | 12 | 1 | 1 | 16 h |
| July | 83°F | 55°F | 69.0°F | 2.42 | 0.0 | 8 | 7 | <1 | 15 h 40 min |
| August | 83°F | 54°F | 68.2°F | 2.01 | 0.0 | 8 | 7 | <1 | 14 h 20 min |
| September | 72°F | 45°F | 58.3°F | 1.76 | 0.3 | 7 | 2 | 3 | 12 h 40 min |
| October | 55°F | 33°F | 43.6°F | 1.31 | 3.4 | 7 | <1 | 15 | 11 h |
| November | 39°F | 20°F | 29.4°F | 0.62 | 6.0 | 7 | <1 | 26 | 9 h 20 min |
| December | 27°F | 10°F | 18.5°F | 0.54 | 8.2 | 7 | <1 | 31 | 8 h 30 min |
| Year (annual) | 54°F | 31°F | 42.4°F | 17.68 | 41.7 | 96 | 16 | 185 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −5°C | −14°C | −9.4°C | 11 mm | 15 cm |
| February | −2°C | −12°C | −7.4°C | 11 mm | 18 cm |
| March | 5°C | −7°C | −1.1°C | 18 mm | 14 cm |
| April | 13°C | −1°C | 5.8°C | 34 mm | 11 cm |
| May | 19°C | 5°C | 11.8°C | 71 mm | 3 cm |
| June | 24°C | 10°C | 16.7°C | 83 mm | 0 cm |
| July | 28°C | 13°C | 20.6°C | 61 mm | 0 cm |
| August | 28°C | 12°C | 20.1°C | 51 mm | 0 cm |
| September | 22°C | 7°C | 14.6°C | 45 mm | 1 cm |
| October | 13°C | 0°C | 6.4°C | 33 mm | 9 cm |
| November | 4°C | −7°C | −1.4°C | 16 mm | 15 cm |
| December | −3°C | −12°C | −7.5°C | 14 mm | 21 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00323705; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at Grassy Butte (2 mi ENE)?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (7).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00323705.
When is the last frost at Grassy Butte (2 mi ENE)?
In Grassy Butte (2 mi ENE), the last spring frost (32°F) comes after May 18 in half of years and after June 1 in one year in ten; the first autumn frost comes before September 23 in half of years and before September 9 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 181 year in 10 after June 1; 9 in 10 after May 7
- First autumn frost, half of years before
- September 231 year in 10 before September 9; 9 in 10 before October 5
NOAA puts the median frost-free season at 125 days, and the season without a hard freeze (28°F) at 145 days.
A hard freeze (28°F) comes after May 9 in half of springs and before October 3 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Grassy Butte (2 mi ENE) in zone 4a in ZIP code 58634, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 4b: the coldest night of a typical year reaches −25°F (30 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in North Dakota · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00323705; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at Grassy Butte (2 mi ENE)?
In a normal year in Grassy Butte (2 mi ENE), 16 days a year reach 90°F (1 of them 100°F or more), 185 nights fall to 32°F or colder and 96 days bring measurable precipitation.
- Days at 90°F or more
- 16a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 185a normal year
- Days that stay below freezing
- 76high of 32°F or less
- Days with 0.01 inch of precipitation
- 96a normal year
- Days with 1 inch of snow or more
- 15a normal year
The highest temperature in this station's record (since 1987) is 110°F, on July 25, 2024; the lowest is −37°F, on January 13, 2024.
The wettest calendar year on that record is 2013, with 25.57 in; the snowiest season is 1993–94, with 58.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00323705; records: ACIS (NOAA Regional Climate Centers), station USC00323705. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Grassy Butte (2 mi ENE)?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds at Grassy Butte (2 mi ENE), 4.0 kWh per square metre a day. July is the sunniest month (86%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 1.7 |
| February | 78% | 2.7 |
| March | 74% | 3.8 |
| April | 72% | 4.8 |
| May | 73% | 5.8 |
| June | 77% | 6.5 |
| July | 86% | 6.9 |
| August | 83% | 5.7 |
| September | 78% | 4.2 |
| October | 71% | 2.6 |
| November | 70% | 1.6 |
| December | 66% | 1.2 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does Grassy Butte (2 mi ENE) record?
A normal year at Grassy Butte (2 mi ENE) brings 8,588 heating degree days, 60% more than the median U.S. place (5,373), and 386 cooling degree days, 57% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,061 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,548 | 0 |
| February | 1,295 | 0 |
| March | 1,082 | 0 |
| April | 675 | 0 |
| May | 370 | 7 |
| June | 130 | 44 |
| July | 31 | 157 |
| August | 46 | 144 |
| September | 235 | 33 |
| October | 666 | 1 |
| November | 1,068 | 0 |
| December | 1,441 | 0 |
| Year (annual) | 8,588 | 386 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00323705. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Have recent years at Grassy Butte (2 mi ENE) been warmer than normal?
2025 averaged 43.3°F, 0.9°F above the 1991-2020 normal of 42.4°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 45.0°F | +2.6°F | 11.69 | – |
| 2022 | 41.0°F | −1.4°F | 21.77 | – |
| 2024 | 44.8°F | +2.4°F | 12.88 | – |
| 2025 | 43.3°F | +0.9°F | 19.51 | – |
Over 35 complete years from 1989 to 2025, the station's annual mean temperature rose at a fitted 0.9°F per century (+0.05°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00323705; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Grassy Butte (2 mi ENE)'s climate compare?
Grassy Butte (2 mi ENE) is warmer than 70 of the 92 places with their own NOAA record in North Dakota, and wetter than 22. Across the 7,247 U.S. stations with normals, its annual mean of 42.4°F is warmer than 10%.
In the Köppen classification computed from these normals, Grassy Butte (2 mi ENE) is Dfb: continental, no dry season, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Questions about Grassy Butte (2 mi ENE)'s climate
What is the coldest month at Grassy Butte (2 mi ENE)?
January, with a normal high of 24°F and a normal low of 6°F. The warmest is July (83°F by day, 55°F at night).
Does it snow at Grassy Butte (2 mi ENE)?
Yes: 42 inches in a normal year, falling on 39 days with 0.1 inch or more, the most in December (8.2 inches).
What is the rainiest month at Grassy Butte (2 mi ENE)?
June, with 3.28 in of precipitation in a normal year; the driest is February with 0.44 in.
What plant hardiness zone is Grassy Butte (2 mi ENE) in?
The USDA's 2023 map puts Grassy Butte (2 mi ENE) in zone 4a in ZIP code 58634, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −25°F (30 years, 1991-2020): zone 4b.
How late can frost come at Grassy Butte (2 mi ENE)?
In half of years the last 32°F night comes after May 18; in one year in ten it comes after June 1. Waiting until June 1 leaves about a one-in-ten chance of a later frost.
Nearby and next
- North Dakota climateThe statewide normals and every place in the state
- Fairfield, ND14 miles from this station, 42.5°F a year
- Killdeer, ND21 miles from this station, 42.3°F a year
- Watford City, ND28 miles from this station, 42.1°F a year
- Dunn Center, ND29 miles from this station, 41.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made