Jamestown weather by month
What a typical year looks like in Jamestown, North Dakota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Jamestown Municipal Airport, 3 km from Jamestown; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 19.8 in504 mm
- Snow a year
- Rare
- Last spring freeze
- May 10
- First fall freeze
- Sep 28
- Heating degree days
- 9,011
- Cooling degree days
- 421
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −20°−29° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Jamestown in January
Highs average 19°−7° and lows 1°−17°, with 0.31 in7.9 mm of precipitation in a typical January.
- Record high
- 56°13° (2012)
- Record low
- −36°−38° (1951)
- Heating degree days
- 1702
- Cooling degree days
- 0
Jamestown in February
Highs average 24°−5° and lows 5°−15°, with 0.37 in9.4 mm of precipitation in a typical February.
- Record high
- 64°18° (1958)
- Record low
- −35°−37° (1994)
- Heating degree days
- 1425
- Cooling degree days
- 0
Jamestown in March
Highs average 37°3° and lows 17°−8°, with 0.69 in18 mm of precipitation in a typical March.
- Record high
- 79°26° (1963)
- Record low
- −24°−31° (1952)
- Heating degree days
- 1178
- Cooling degree days
- 0
Jamestown in April
Highs average 53°12° and lows 30°−1°, with 1.2 in31 mm of precipitation in a typical April.
- Record high
- 97°36° (1992)
- Record low
- −6°−21° (1954)
- Heating degree days
- 708
- Cooling degree days
- 0
Jamestown in May
Highs average 67°19° and lows 43°6°, with 3.3 in83 mm of precipitation in a typical May.
- Record high
- 100°38° (1969)
- Record low
- 16°−9° (1967)
- Heating degree days
- 335
- Cooling degree days
- 16
Jamestown in June
Highs average 76°24° and lows 54°12°, with 3.4 in86 mm of precipitation in a typical June.
- Record high
- 105°41° (1961)
- Record low
- 32°0° (1969)
- Heating degree days
- 83
- Cooling degree days
- 82
Jamestown in July
Highs average 81°27° and lows 58°15°, with 3.6 in91 mm of precipitation in a typical July.
- Record high
- 108°42° (1973)
- Record low
- 38°3° (1967)
- Heating degree days
- 21
- Cooling degree days
- 165
Jamestown in August
Highs average 80°27° and lows 55°13°, with 2.4 in61 mm of precipitation in a typical August.
- Record high
- 106°41° (1958)
- Record low
- 32°0° (1982)
- Heating degree days
- 44
- Cooling degree days
- 123
Jamestown in September
Highs average 71°22° and lows 46°8°, with 2.1 in52 mm of precipitation in a typical September.
- Record high
- 105°41° (1978)
- Record low
- 18°−8° (1965)
- Heating degree days
- 231
- Cooling degree days
- 33
Jamestown in OctoberThis month
Highs average 55°13° and lows 33°0°, with 1.7 in42 mm of precipitation in a typical October.
- Record high
- 94°34° (1963)
- Record low
- −1°−18° (1991)
- Heating degree days
- 659
- Cooling degree days
- 2
Jamestown in November
Highs average 38°3° and lows 19°−7°, with 0.53 in13 mm of precipitation in a typical November.
- Record high
- 77°25° (1978)
- Record low
- −28°−33° (2014)
- Heating degree days
- 1098
- Cooling degree days
- 0
Jamestown in December
Highs average 24°−4° and lows 7°−14°, with 0.34 in8.6 mm of precipitation in a typical December.
- Record high
- 63°17° (1969)
- Record low
- −37°−38° (1983)
- Heating degree days
- 1527
- Cooling degree days
- 0