Underwood, North Dakota climate: Normal weather by month, frost dates and records
Underwood's normal year runs from 1°F January nights to 82°F July afternoons, with 18.0 inches of precipitation and 39 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.9°C, January lows of −17°C, July highs of 28°C, 458 mm of precipitation a year.
- NOAA stationUnderwood
- Station IDUSC00328872
- Location47.45°N 101.15°W
- Elevation2,045 ft (623 m)
- Population771
On October 23, the normal high in Underwood is 50°F and the normal low 28°F, and the chance of measurable rain or snow is 21%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Underwood.
- Jan 19° 1°
- Feb 23° 4°
- Mar 36° 16°
- Apr 53° 29°
- May 66° 42°
- Jun 75° 52°
- Jul 82° 57°
- Aug 82° 55°
- Sep 71° 45°
- Oct 54° 32°
- Nov 37° 18°
- Dec 24° 7°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Underwood each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of 1°F. The most precipitation falls in June (3.78 in), the least in February (0.50 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 19°F | 1°F | 9.8°F | 0.54 | 6.7 | 6 | <1 | 31 | 8 h 50 min |
| February | 23°F | 4°F | 13.4°F | 0.50 | 5.0 | 6 | <1 | 28 | 10 h 10 min |
| March | 36°F | 16°F | 26.1°F | 0.78 | 6.8 | 6 | <1 | 29 | 11 h 50 min |
| April | 53°F | 29°F | 40.7°F | 1.39 | 2.7 | 7 | <1 | 19 | 13 h 30 min |
| May | 66°F | 42°F | 53.7°F | 2.59 | 0.7 | 10 | <1 | 4 | 15 h |
| June | 75°F | 52°F | 63.7°F | 3.78 | 0.0 | 11 | 2 | <1 | 16 h |
| July | 82°F | 57°F | 69.6°F | 2.44 | 0.0 | 9 | 6 | <1 | 15 h 40 min |
| August | 82°F | 55°F | 68.3°F | 1.68 | 0.0 | 7 | 7 | <1 | 14 h 20 min |
| September | 71°F | 45°F | 58.1°F | 1.56 | 0.0 | 7 | 1 | 1 | 12 h 40 min |
| October | 54°F | 32°F | 42.9°F | 1.41 | 1.6 | 7 | <1 | 15 | 11 h |
| November | 37°F | 18°F | 27.4°F | 0.73 | 4.2 | 5 | <1 | 28 | 9 h 20 min |
| December | 24°F | 7°F | 15.4°F | 0.63 | 10.9 | 7 | <1 | 31 | 8 h 30 min |
| Year (annual) | 52°F | 30°F | 40.8°F | 18.03 | 38.6 | 89 | 16 | 186 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −7°C | −17°C | −12.3°C | 14 mm | 17 cm |
| February | −5°C | −16°C | −10.3°C | 13 mm | 13 cm |
| March | 2°C | −9°C | −3.3°C | 20 mm | 17 cm |
| April | 11°C | −2°C | 4.8°C | 35 mm | 7 cm |
| May | 19°C | 5°C | 12.1°C | 66 mm | 2 cm |
| June | 24°C | 11°C | 17.6°C | 96 mm | 0 cm |
| July | 28°C | 14°C | 20.9°C | 62 mm | 0 cm |
| August | 28°C | 13°C | 20.2°C | 43 mm | 0 cm |
| September | 22°C | 7°C | 14.5°C | 40 mm | 0 cm |
| October | 12°C | 0°C | 6.1°C | 36 mm | 4 cm |
| November | 3°C | −8°C | −2.6°C | 19 mm | 11 cm |
| December | −5°C | −14°C | −9.2°C | 16 mm | 28 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00328872; 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.
When is the best weather to visit Underwood?
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 USC00328872.
When is the last frost in Underwood?
In Underwood, the last spring frost (32°F) comes after May 10 in half of years and after May 25 in one year in ten; the first autumn frost comes before September 29 in half of years and before September 17 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 101 year in 10 after May 25; 9 in 10 after April 30
- First autumn frost, half of years before
- September 291 year in 10 before September 17; 9 in 10 before October 11
NOAA puts the median frost-free season at 139 days, and the season without a hard freeze (28°F) at 157 days.
A hard freeze (28°F) comes after May 2 in half of springs and before October 7 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Underwood in zone 4a in ZIP code 58576, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Underwood's NOAA station is in zone 4b: the coldest night of a typical year reaches −24°F (23 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 USC00328872; 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 in Underwood?
In a normal year in Underwood, 16 days a year reach 90°F (1 of them 100°F or more), 186 nights fall to 32°F or colder and 89 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
- 186a normal year
- Days that stay below freezing
- 90high of 32°F or less
- Days with 0.01 inch of precipitation
- 89a normal year
- Days with 1 inch of snow or more
- 12a normal year
The highest temperature in this station's record (since 1954) is 106°F, on June 30, 2002; the lowest is −37°F, on January 29, 1966.
The wettest calendar year on that record is 2000, with 25.31 in; the snowiest season is 1996–97, with 116.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00328872; records: ACIS (NOAA Regional Climate Centers), station USC00328872. Records use complete months only; a month missing more than three days is left out.
How sunny is Underwood?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Underwood, 3.9 kWh per square metre a day. July is the sunniest month (84%) and November the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 81% | 1.8 |
| February | 83% | 2.9 |
| March | 77% | 3.9 |
| April | 72% | 4.8 |
| May | 73% | 5.8 |
| June | 76% | 6.3 |
| July | 84% | 6.7 |
| August | 82% | 5.5 |
| September | 78% | 4.1 |
| October | 70% | 2.6 |
| November | 68% | 1.6 |
| December | 68% | 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 much heating and cooling does Underwood need?
A normal year in Underwood brings 9,221 heating degree days, 72% more than the median U.S. place (5,373), and 431 cooling degree days, 53% 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 2,127 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,711 | 0 |
| February | 1,443 | 0 |
| March | 1,206 | 0 |
| April | 731 | 0 |
| May | 361 | 12 |
| June | 103 | 64 |
| July | 26 | 169 |
| August | 47 | 150 |
| September | 239 | 34 |
| October | 688 | 1 |
| November | 1,128 | 0 |
| December | 1,538 | 0 |
| Year (annual) | 9,221 | 431 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00328872. 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.
Has Underwood been warmer than normal lately?
2025 averaged 41.8°F, 1.0°F above the 1991-2020 normal of 40.8°F. 3 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 43.3°F | +2.5°F | 13.96 | – |
| 2024 | 43.3°F | +2.5°F | – | – |
| 2025 | 41.8°F | +1.0°F | 17.55 | – |
Over 50 complete years from 1956 to 2025, the station's annual mean temperature rose at a fitted 5.0°F per century (+0.28°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00328872; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Underwood's climate compare?
Underwood is warmer than 37 of the other 91 places with their own NOAA record in North Dakota, and wetter than 23. Across the 7,247 U.S. stations with normals, its annual mean of 40.8°F is warmer than 7%.
In the Köppen classification computed from these normals, Underwood 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.
Which places near Underwood share this climate record?
Coleharbor has no NOAA station with 1991-2020 normals of its own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Coleharbor, ND62 people · 7 mi NW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Underwood's climate
What is the coldest month in Underwood?
January, with a normal high of 19°F and a normal low of 1°F. The warmest is July (82°F by day, 57°F at night).
Does it snow in Underwood?
Yes: 39 inches in a normal year, falling on 28 days with 0.1 inch or more, the most in December (10.9 inches).
What is the rainiest month in Underwood?
June, with 3.78 in of precipitation in a normal year; the driest is February with 0.50 in.
What plant hardiness zone is Underwood in?
The USDA's 2023 map puts Underwood in zone 4a in ZIP code 58576, the nearest ZIP area. By the same method at Underwood's NOAA station, the coldest night of a typical year reaches −24°F (23 years, 1991-2020): zone 4b.
How late can frost come in Underwood?
In half of years the last 32°F night comes after May 10; in one year in ten it comes after May 25. Waiting until May 25 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
- Riverdale, ND11 miles from this station, 41.8°F a year
- Washburn, ND12 miles from this station, 42.3°F a year
- Turtle Lake, ND13 miles from this station, 41.1°F a year
- Garrison, ND19 miles from this station, 41.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made