Herron weather by month
What a typical year looks like in Herron, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Havre Airport Asos, 1 km from Herron; records cover 1880–2026.
The year at a glance
- Precipitation a year
- 11.8 in300 mm
- Snow a year
- 41 in104 cm
- Last spring freeze
- May 15
- First fall freeze
- Sep 22
- Heating degree days
- 8,176
- Cooling degree days
- 404
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −25°−32° (heating, 99%) and 99°37° (cooling, 1%).
Month by month
Herron in January
Highs average 28°−2° and lows 7°−14°, with 0.43 in11 mm of precipitation and 9 in23 cm of snow in a typical January.
- Record high
- 68°20° (1992)
- Record low
- −57°−49° (1916)
- Heating degree days
- 1465
- Cooling degree days
- 0
Herron in February
Highs average 33°0° and lows 10°−12°, with 0.38 in9.7 mm of precipitation and 7 in18 cm of snow in a typical February.
- Record high
- 74°23° (1992)
- Record low
- −55°−48° (1887)
- Heating degree days
- 1224
- Cooling degree days
- 0
Herron in March
Highs average 44°7° and lows 20°−7°, with 0.5 in13 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 79°26° (2004)
- Record low
- −41° (1897)
- Heating degree days
- 1022
- Cooling degree days
- 0
Herron in April
Highs average 57°14° and lows 31°−1°, with 1 in26 mm of precipitation and 2.7 in6.9 cm of snow in a typical April.
- Record high
- 95°35° (1939)
- Record low
- −14°−26° (1967)
- Heating degree days
- 632
- Cooling degree days
- 0
Herron in May
Highs average 68°20° and lows 40°5°, with 1.9 in47 mm of precipitation and 0.4 in1 cm of snow in a typical May.
- Record high
- 98°37° (1936)
- Record low
- 14°−10° (1954)
- Heating degree days
- 354
- Cooling degree days
- 8
Herron in June
Highs average 76°24° and lows 49°9°, with 2.5 in63 mm of precipitation in a typical June.
- Record high
- 108°42° (1900)
- Record low
- 29°−2° (1910)
- Heating degree days
- 130
- Cooling degree days
- 42
Herron in July
Highs average 86°30° and lows 54°12°, with 1.5 in39 mm of precipitation in a typical July.
- Record high
- 108°42° (1886)
- Record low
- 31°−1° (1892)
- Heating degree days
- 26
- Cooling degree days
- 176
Herron in August
Highs average 85°29° and lows 52°11°, with 0.92 in23 mm of precipitation in a typical August.
- Record high
- 111°44° (1961)
- Record low
- 27°−3° (1910)
- Heating degree days
- 49
- Cooling degree days
- 154
Herron in September
Highs average 73°23° and lows 43°6°, with 1.1 in27 mm of precipitation and 0.4 in1 cm of snow in a typical September.
- Record high
- 104°40° (2022)
- Record low
- 18°−8° (1895)
- Heating degree days
- 241
- Cooling degree days
- 23
Herron in OctoberThis month
Highs average 58°14° and lows 31°−1°, with 0.75 in19 mm of precipitation and 2 in5.1 cm of snow in a typical October.
- Record high
- 91°33° (1943)
- Record low
- −21°−29° (1991)
- Heating degree days
- 649
- Cooling degree days
- 1
Herron in November
Highs average 42°6° and lows 20°−7°, with 0.49 in12 mm of precipitation and 6 in16 cm of snow in a typical November.
- Record high
- 78°26° (1975)
- Record low
- −33°−36° (1896)
- Heating degree days
- 1023
- Cooling degree days
- 0
Herron in December
Highs average 32°0° and lows 11°−12°, with 0.4 in10 mm of precipitation and 8 in21 cm of snow in a typical December.
- Record high
- 71°22° (1939)
- Record low
- −50°−46° (1884)
- Heating degree days
- 1361
- Cooling degree days
- 0