Fortuna weather by month
What a typical year looks like in Fortuna, North Dakota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Westby, 20 km from Fortuna; records cover 1937–2026.
The year at a glance
- Precipitation a year
- 14.9 in379 mm
- Snow a year
- Rare
- Last spring freeze
- May 16
- First fall freeze
- Sep 18
- Heating degree days
- 9,697
- Cooling degree days
- 286
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −27°−33° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Fortuna in January
Highs average 20°−7° and lows −2°−19°, with 0.37 in9.4 mm of precipitation in a typical January.
- Record high
- 57°14° (2024)
- Record low
- −45°−43° (1943)
- Heating degree days
- 1747
- Cooling degree days
- 0
Fortuna in February
Highs average 24°−5° and lows 2°−17°, with 0.34 in8.6 mm of precipitation in a typical February.
- Record high
- 66°19° (1992)
- Record low
- −42°−41° (1962)
- Heating degree days
- 1462
- Cooling degree days
- 0
Fortuna in March
Highs average 36°2° and lows 14°−10°, with 0.55 in14 mm of precipitation in a typical March.
- Record high
- 77°25° (1946)
- Record low
- −33°−36° (1948)
- Heating degree days
- 1242
- Cooling degree days
- 0
Fortuna in April
Highs average 53°11° and lows 27°−3°, with 0.98 in25 mm of precipitation in a typical April.
- Record high
- 91°33° (1939)
- Record low
- −18°−28° (1975)
- Heating degree days
- 752
- Cooling degree days
- 0
Fortuna in May
Highs average 65°19° and lows 40°4°, with 2.2 in55 mm of precipitation in a typical May.
- Record high
- 102°39° (1980)
- Record low
- 10°−12° (1945)
- Heating degree days
- 397
- Cooling degree days
- 7
Fortuna in June
Highs average 73°23° and lows 50°10°, with 3.1 in80 mm of precipitation in a typical June.
- Record high
- 103°39° (1937)
- Record low
- 28°−2° (1937)
- Heating degree days
- 145
- Cooling degree days
- 40
Fortuna in July
Highs average 80°27° and lows 55°13°, with 2.5 in63 mm of precipitation in a typical July.
- Record high
- 112°44° (1937)
- Record low
- 35°2° (1987)
- Heating degree days
- 46
- Cooling degree days
- 116
Fortuna in August
Highs average 80°27° and lows 52°11°, with 1.6 in42 mm of precipitation in a typical August.
- Record high
- 108°42° (1983)
- Record low
- 29°−2° (1958)
- Heating degree days
- 77
- Cooling degree days
- 104
Fortuna in September
Highs average 70°21° and lows 41°5°, with 1.3 in32 mm of precipitation in a typical September.
- Record high
- 103°39° (1940)
- Record low
- 15°−9° (1961)
- Heating degree days
- 308
- Cooling degree days
- 18
Fortuna in OctoberThis month
Highs average 54°12° and lows 29°−2°, with 0.97 in25 mm of precipitation in a typical October.
- Record high
- 92°33° (1992)
- Record low
- −6°−21° (2020)
- Heating degree days
- 743
- Cooling degree days
- 1
Fortuna in November
Highs average 36°2° and lows 15°−10°, with 0.52 in13 mm of precipitation in a typical November.
- Record high
- 73°23° (1999)
- Record low
- −26°−32° (1996)
- Heating degree days
- 1189
- Cooling degree days
- 0
Fortuna in December
Highs average 24°−5° and lows 4°−16°, with 0.48 in12 mm of precipitation in a typical December.
- Record high
- 61°16° (1939)
- Record low
- −42°−41° (1983)
- Heating degree days
- 1589
- Cooling degree days
- 0