Hermantown weather by month
What a typical year looks like in Hermantown, Minnesota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Duluth International Airport, 6 km from Hermantown; records cover 1874–2026.
The year at a glance
- Precipitation a year
- 31.2 in792 mm
- Snow a year
- 90 in229 cm
- Last spring freeze
- May 13
- First fall freeze
- Oct 1
- Heating degree days
- 9,116
- Cooling degree days
- 255
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −19°−28° (heating, 99%) and 87°31° (cooling, 1%).
Month by month
Hermantown in January
Highs average 20°−7° and lows 2°−16°, with 0.95 in24 mm of precipitation and 17 in43 cm of snow in a typical January.
- Record high
- 55°13° (1942)
- Record low
- −41° (1885)
- Heating degree days
- 1669
- Cooling degree days
- 0
Hermantown in February
Highs average 25°−4° and lows 6°−14°, with 1 in26 mm of precipitation and 15 in38 cm of snow in a typical February.
- Record high
- 58°14° (1895)
- Record low
- −39° (1996)
- Heating degree days
- 1389
- Cooling degree days
- 0
Hermantown in March
Highs average 36°2° and lows 18°−8°, with 1.5 in37 mm of precipitation and 13 in33 cm of snow in a typical March.
- Record high
- 81°27° (1946)
- Record low
- −29°−34° (1989)
- Heating degree days
- 1178
- Cooling degree days
- 0
Hermantown in April
Highs average 49°10° and lows 30°−1°, with 2.5 in64 mm of precipitation and 9 in23 cm of snow in a typical April.
- Record high
- 88°31° (1952)
- Record low
- −5°−21° (1954)
- Heating degree days
- 764
- Cooling degree days
- 0
Hermantown in May
Highs average 63°17° and lows 41°5°, with 3.4 in86 mm of precipitation and 0.8 in2 cm of snow in a typical May.
- Record high
- 95°35° (1939)
- Record low
- 16°−9° (1907)
- Heating degree days
- 410
- Cooling degree days
- 7
Hermantown in June
Highs average 72°22° and lows 50°10°, with 4.4 in112 mm of precipitation in a typical June.
- Record high
- 97°36° (1910)
- Record low
- 27°−3° (1972)
- Heating degree days
- 152
- Cooling degree days
- 36
Hermantown in July
Highs average 78°25° and lows 56°13°, with 3.9 in100 mm of precipitation in a typical July.
- Record high
- 106°41° (1936)
- Record low
- 35°2° (1988)
- Heating degree days
- 50
- Cooling degree days
- 110
Hermantown in August
Highs average 76°24° and lows 55°13°, with 3.7 in95 mm of precipitation in a typical August.
- Record high
- 97°36° (1930)
- Record low
- 32°0° (1986)
- Heating degree days
- 64
- Cooling degree days
- 80
Hermantown in September
Highs average 67°20° and lows 47°8°, with 3.5 in88 mm of precipitation and 0.1 in0.3 cm of snow in a typical September.
- Record high
- 97°36° (2023)
- Record low
- 23°−5° (1962)
- Heating degree days
- 254
- Cooling degree days
- 21
Hermantown in OctoberThis month
Highs average 53°12° and lows 36°2°, with 2.9 in74 mm of precipitation and 2.7 in6.9 cm of snow in a typical October.
- Record high
- 86°30° (1953)
- Record low
- 6°−14° (1917)
- Heating degree days
- 647
- Cooling degree days
- 1
Hermantown in November
Highs average 37°3° and lows 23°−5°, with 2 in50 mm of precipitation and 14 in36 cm of snow in a typical November.
- Record high
- 75°24° (2020)
- Record low
- −29°−34° (1875)
- Heating degree days
- 1056
- Cooling degree days
- 0
Hermantown in December
Highs average 25°−4° and lows 10°−12°, with 1.5 in37 mm of precipitation and 19 in47 cm of snow in a typical December.
- Record high
- 56°13° (1939)
- Record low
- −35°−37° (1917)
- Heating degree days
- 1483
- Cooling degree days
- 0