Jamestown (38 mi WSW), North Dakota climate: Climate normals at a NOAA weather station
Jamestown (38 mi WSW)'s normal year runs from 0°F January nights to 80°F July afternoons, with 20.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.6°C, January lows of −18°C, July highs of 27°C, 531 mm of precipitation a year.
- NOAA stationJamestown (38 mi WSW)
- Station IDUSW00054937
- Location46.77°N 99.48°W
- Elevation1,920 ft (585 m)
On October 14, the normal high in Jamestown (38 mi WSW) is 55°F and the normal low 33°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Jamestown (38 mi WSW).
- Jan 19° 0°
- Feb 22° 4°
- Mar 36° 17°
- Apr 52° 28°
- May 64° 41°
- Jun 73° 52°
- Jul 80° 57°
- Aug 79° 55°
- Sep 70° 46°
- Oct 53° 32°
- Nov 37° 18°
- Dec 23° 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 at Jamestown (38 mi WSW) each month?
July is the warmest month, with normal highs of 80°F; January the coldest, with normal lows of 0°F. The most precipitation falls in June (3.70 in), the least in January (0.48 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 19°F | 0°F | 9.4°F | 0.48 | – | <1 | 31 | 9 h |
| February | 22°F | 4°F | 13.0°F | 0.49 | – | <1 | 28 | 10 h 20 min |
| March | 36°F | 17°F | 26.3°F | 0.94 | – | <1 | 29 | 11 h 50 min |
| April | 52°F | 28°F | 39.9°F | 1.40 | – | <1 | 19 | 13 h 30 min |
| May | 64°F | 41°F | 52.7°F | 2.94 | – | <1 | 5 | 15 h |
| June | 73°F | 52°F | 62.8°F | 3.70 | – | <1 | <1 | 15 h 50 min |
| July | 80°F | 57°F | 68.6°F | 3.35 | – | 3 | <1 | 15 h 30 min |
| August | 79°F | 55°F | 67.1°F | 2.43 | – | 2 | <1 | 14 h 20 min |
| September | 70°F | 46°F | 57.7°F | 2.29 | – | 1 | 1 | 12 h 40 min |
| October | 53°F | 32°F | 42.7°F | 1.68 | – | <1 | 16 | 11 h |
| November | 37°F | 18°F | 27.8°F | 0.64 | – | <1 | 27 | 9 h 30 min |
| December | 23°F | 7°F | 15.1°F | 0.57 | – | <1 | 31 | 8 h 30 min |
| Year (annual) | 51°F | 30°F | 40.3°F | 20.91 | – | 6 | 186 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −7°C | −18°C | −12.6°C | 12 mm |
| February | −5°C | −16°C | −10.6°C | 12 mm |
| March | 2°C | −8°C | −3.2°C | 24 mm |
| April | 11°C | −2°C | 4.4°C | 36 mm |
| May | 18°C | 5°C | 11.5°C | 75 mm |
| June | 23°C | 11°C | 17.1°C | 94 mm |
| July | 27°C | 14°C | 20.3°C | 85 mm |
| August | 26°C | 13°C | 19.5°C | 62 mm |
| September | 21°C | 8°C | 14.3°C | 58 mm |
| October | 12°C | 0°C | 5.9°C | 43 mm |
| November | 3°C | −8°C | −2.3°C | 16 mm |
| December | −5°C | −14°C | −9.4°C | 14 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Streeter (4 miles away), gets 49 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00054937; 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 Jamestown (38 mi WSW)?
Normal highs sit between 65°F and 85°F in 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 USW00054937.
When is the last frost at Jamestown (38 mi WSW)?
In Jamestown (38 mi WSW), the last spring frost (32°F) comes after May 14 in half of years and after May 26 in one year in ten; the first autumn frost comes before September 27 in half of years and before September 15 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 141 year in 10 after May 26; 9 in 10 after May 2
- First autumn frost, half of years before
- September 271 year in 10 before September 15; 9 in 10 before October 10
NOAA puts the median frost-free season at 135 days, and the season without a hard freeze (28°F) at 152 days.
A hard freeze (28°F) comes after May 5 in half of springs and before October 6 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Jamestown (38 mi WSW) in zone 4a in ZIP code 58483, 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 USW00054937; 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 at Jamestown (38 mi WSW)?
In a normal year in Jamestown (38 mi WSW), 6 days a year reach 90°F and 186 nights fall to 32°F or colder.
- Days at 90°F or more
- 6a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 186a normal year
- Days that stay below freezing
- 100high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USW00054937.
How sunny is it at Jamestown (38 mi WSW)?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds at Jamestown (38 mi WSW), 4.0 kWh per square metre a day. February is the sunniest month (84%) and November the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 81% | 1.9 |
| February | 84% | 3.0 |
| March | 77% | 4.0 |
| April | 73% | 5.0 |
| May | 72% | 5.7 |
| June | 76% | 6.4 |
| July | 84% | 6.6 |
| August | 82% | 5.5 |
| September | 78% | 4.2 |
| October | 70% | 2.7 |
| November | 70% | 1.7 |
| December | 70% | 1.3 |
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 Jamestown (38 mi WSW) record?
A normal year at Jamestown (38 mi WSW) brings 9,315 heating degree days, 73% more than the median U.S. place (5,373), and 335 cooling degree days, 63% 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 1,979 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,723 | 0 |
| February | 1,454 | 0 |
| March | 1,201 | 0 |
| April | 753 | 0 |
| May | 391 | 8 |
| June | 112 | 46 |
| July | 26 | 137 |
| August | 49 | 114 |
| September | 246 | 28 |
| October | 695 | 2 |
| November | 1,118 | 0 |
| December | 1,547 | 0 |
| Year (annual) | 9,315 | 335 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00054937. 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 Jamestown (38 mi WSW) been warmer than normal?
2025 averaged 41.9°F, 1.6°F above the 1991-2020 normal of 40.3°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 43.5°F | +3.2°F | 17.24 |
| 2023 | 41.3°F | +1.0°F | 20.40 |
| 2024 | 43.4°F | +3.1°F | 30.23 |
| 2025 | 41.9°F | +1.6°F | 21.49 |
Source: observed years: ACIS, station USW00054937. A year counts only with all twelve months complete.
How does Jamestown (38 mi WSW)'s climate compare?
Jamestown (38 mi WSW) is warmer than 34 of the 92 places with their own NOAA record in North Dakota, and wetter than 57. Across the 7,247 U.S. stations with normals, its annual mean of 40.3°F is warmer than 6%.
In the Köppen classification computed from these normals, Jamestown (38 mi WSW) 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 Jamestown (38 mi WSW) share this climate record?
2 places have no NOAA station with 1991-2020 normals of their 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.
- Medina, ND264 people · 12 mi NE
- Tappen, ND213 people · 10 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 Jamestown (38 mi WSW)'s climate
What is the coldest month at Jamestown (38 mi WSW)?
January, with a normal high of 19°F and a normal low of 0°F. The warmest is July (80°F by day, 57°F at night).
Does it snow at Jamestown (38 mi WSW)?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Streeter (4 miles away), records 49 inches of snow in a normal year.
What is the rainiest month at Jamestown (38 mi WSW)?
June, with 3.70 in of precipitation in a normal year; the driest is January with 0.48 in.
What plant hardiness zone is Jamestown (38 mi WSW) in?
The USDA's 2023 map puts Jamestown (38 mi WSW) in zone 4a in ZIP code 58483, the nearest ZIP area.
How late can frost come at Jamestown (38 mi WSW)?
In half of years the last 32°F night comes after May 14; in one year in ten it comes after May 26. Waiting until May 26 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
- Streeter, ND4 miles from this station, 40.9°F a year
- Gackle, ND19 miles from this station, 42.1°F a year
- Napoleon, ND23 miles from this station, 41.2°F a year
- Steele, ND24 miles from this station, 41.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made