Wilton, North Dakota climate: Normal weather by month, frost dates and records
Wilton's normal year runs from 1°F January nights to 80°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.8°C, January lows of −17°C, July highs of 27°C.
- NOAA stationWilton
- Station IDUSC00329455
- Location47.16°N 100.79°W
- Elevation2,188 ft (667 m)
- Population714
On October 22, the normal high in Wilton is 51°F and the normal low 29°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Wilton.
- Jan 19° 1°
- Feb 23° 4°
- Mar 36° 16°
- Apr 52° 29°
- May 65° 42°
- Jun 73° 52°
- Jul 80° 58°
- Aug 80° 55°
- Sep 70° 46°
- Oct 54° 32°
- Nov 38° 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 Wilton each month?
July is the warmest month, with normal highs of 80°F; January the coldest, with normal lows of 1°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 19°F | 1°F | 10.1°F | – | <1 | 31 | 8 h 50 min |
| February | 23°F | 4°F | 13.8°F | – | <1 | 28 | 10 h 20 min |
| March | 36°F | 16°F | 26.0°F | – | <1 | 28 | 11 h 50 min |
| April | 52°F | 29°F | 40.3°F | – | <1 | 18 | 13 h 30 min |
| May | 65°F | 42°F | 53.6°F | – | <1 | 4 | 15 h |
| June | 73°F | 52°F | 62.7°F | – | 1 | <1 | 15 h 50 min |
| July | 80°F | 58°F | 68.9°F | – | 4 | <1 | 15 h 30 min |
| August | 80°F | 55°F | 67.6°F | – | 4 | <1 | 14 h 20 min |
| September | 70°F | 46°F | 58.1°F | – | 2 | 1 | 12 h 40 min |
| October | 54°F | 32°F | 43.2°F | – | <1 | 15 | 11 h |
| November | 38°F | 18°F | 27.8°F | – | <1 | 28 | 9 h 20 min |
| December | 24°F | 7°F | 15.5°F | – | <1 | 31 | 8 h 30 min |
| Year (annual) | 51°F | 30°F | 40.6°F | – | 9 | 183 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | −7°C | −17°C | −12.2°C |
| February | −5°C | −15°C | −10.1°C |
| March | 2°C | −9°C | −3.3°C |
| April | 11°C | −2°C | 4.6°C |
| May | 18°C | 6°C | 12.0°C |
| June | 23°C | 11°C | 17.1°C |
| July | 27°C | 14°C | 20.5°C |
| August | 27°C | 13°C | 19.8°C |
| September | 21°C | 8°C | 14.5°C |
| October | 12°C | 0°C | 6.2°C |
| November | 3°C | −8°C | −2.3°C |
| December | −4°C | −14°C | −9.2°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Washburn (15 miles away), gets 43 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00329455; 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 Wilton?
Normal highs sit between 65°F and 85°F in May, June, July, August and September.
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 USC00329455.
When is the last frost in Wilton?
In Wilton, the last spring frost (32°F) comes after May 11 in half of years and after May 25 in one year in ten; the first autumn frost comes before September 30 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 111 year in 10 after May 25; 9 in 10 after April 30
- First autumn frost, half of years before
- September 301 year in 10 before September 17; 9 in 10 before October 12
NOAA puts the median frost-free season at 142 days, and the season without a hard freeze (28°F) at 159 days.
A hard freeze (28°F) comes after May 1 in half of springs and before October 9 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Wilton in zone 4a in ZIP code 58579, the nearest ZIP area.
Frost dates for every NOAA station in North Dakota · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00329455; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Wilton?
In a normal year in Wilton, 9 days a year reach 90°F and 183 nights fall to 32°F or colder.
- Days at 90°F or more
- 9a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 183a normal year
- Days that stay below freezing
- 93high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00329455.
How sunny is Wilton?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Wilton, 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 Wilton need?
A normal year in Wilton brings 9,210 heating degree days, 71% more than the median U.S. place (5,373), and 373 cooling degree days, 59% 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 2,047 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,702 | 0 |
| February | 1,434 | 0 |
| March | 1,208 | 0 |
| April | 740 | 0 |
| May | 362 | 8 |
| June | 120 | 53 |
| July | 29 | 149 |
| August | 48 | 129 |
| September | 241 | 34 |
| October | 677 | 1 |
| November | 1,114 | 0 |
| December | 1,536 | 0 |
| Year (annual) | 9,210 | 373 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00329455. 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.
How does Wilton's climate compare?
Wilton is warmer than 36 of the other 91 places with their own NOAA record in North Dakota. Across the 7,247 U.S. stations with normals, its annual mean of 40.6°F is warmer than 7%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Wilton share this climate record?
Regan 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.
- Regan, ND33 people · 12 mi E
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 Wilton's climate
What is the coldest month in Wilton?
January, with a normal high of 19°F and a normal low of 1°F. The warmest is July (80°F by day, 58°F at night).
Does it snow in Wilton?
Yes. NOAA publishes no 1991-2020 snowfall normal for Wilton's NOAA station; the nearest record that keeps one, Washburn (15 miles away), records 43 inches of snow in a normal year.
What plant hardiness zone is Wilton in?
The USDA's 2023 map puts Wilton in zone 4a in ZIP code 58579, the nearest ZIP area.
How late can frost come in Wilton?
In half of years the last 32°F night comes after May 11; 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
- Washburn, ND15 miles from this station, 42.3°F a year
- Center, ND21 miles from this station, 42.6°F a year
- Mandan, ND25 miles from this station, 42.4°F a year
- Turtle Lake, ND25 miles from this station, 41.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made