Manhattan weather by month
What a typical year looks like in Manhattan, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at BOZEMAN GALLATIN FIELD AP, 15 km from Manhattan; records cover 1941–2026.
The year at a glance
- Precipitation a year
- 13.4 in341 mm
- Snow a year
- Rare
- Last spring freeze
- May 31
- First fall freeze
- Sep 9
- Heating degree days
- 8,246
- Cooling degree days
- 233
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 96°36° (cooling, 1%).
Month by month
Manhattan in January
Highs average 32°0° and lows 10°−12°, with 0.44 in11 mm of precipitation in a typical January.
- Record high
- 60°16° (1953)
- Record low
- −46°−43° (1957)
- Heating degree days
- 1358
- Cooling degree days
- 0
Manhattan in February
Highs average 36°2° and lows 13°−11°, with 0.42 in11 mm of precipitation in a typical February.
- Record high
- 66°19° (1995)
- Record low
- −43°−42° (1989)
- Heating degree days
- 1144
- Cooling degree days
- 0
Manhattan in March
Highs average 46°8° and lows 22°−6°, with 0.93 in24 mm of precipitation in a typical March.
- Record high
- 79°26° (2026)
- Record low
- −39° (2019)
- Heating degree days
- 961
- Cooling degree days
- 0
Manhattan in April
Highs average 55°13° and lows 29°−2°, with 1.7 in43 mm of precipitation in a typical April.
- Record high
- 86°30° (1962)
- Record low
- −5°−21° (1970)
- Heating degree days
- 684
- Cooling degree days
- 0
Manhattan in May
Highs average 65°18° and lows 38°3°, with 2.1 in54 mm of precipitation in a typical May.
- Record high
- 92°33° (1954)
- Record low
- 14°−10° (2002)
- Heating degree days
- 426
- Cooling degree days
- 1
Manhattan in June
Highs average 74°23° and lows 44°7°, with 2.5 in65 mm of precipitation in a typical June.
- Record high
- 100°38° (1990)
- Record low
- 26°−3° (1951)
- Heating degree days
- 198
- Cooling degree days
- 17
Manhattan in July
Highs average 85°30° and lows 49°10°, with 1.1 in27 mm of precipitation in a typical July.
- Record high
- 106°41° (2007)
- Record low
- 30°−1° (1944)
- Heating degree days
- 42
- Cooling degree days
- 117
Manhattan in August
Highs average 84°29° and lows 47°9°, with 0.94 in24 mm of precipitation in a typical August.
- Record high
- 103°39° (1961)
- Record low
- 27°−3° (1992)
- Heating degree days
- 64
- Cooling degree days
- 87
Manhattan in September
Highs average 73°23° and lows 40°4°, with 1 in25 mm of precipitation in a typical September.
- Record high
- 100°38° (2020)
- Record low
- 15°−9° (1985)
- Heating degree days
- 274
- Cooling degree days
- 11
Manhattan in OctoberThis month
Highs average 58°14° and lows 29°−1°, with 1.1 in28 mm of precipitation in a typical October.
- Record high
- 89°32° (2010)
- Record low
- −20°−29° (2020)
- Heating degree days
- 670
- Cooling degree days
- 0
Manhattan in November
Highs average 42°5° and lows 18°−8°, with 0.74 in19 mm of precipitation in a typical November.
- Record high
- 76°24° (2009)
- Record low
- −36°−38° (1959)
- Heating degree days
- 1052
- Cooling degree days
- 0
Manhattan in December
Highs average 32°0° and lows 10°−12°, with 0.44 in11 mm of precipitation in a typical December.
- Record high
- 66°19° (2021)
- Record low
- −46°−43° (1983)
- Heating degree days
- 1373
- Cooling degree days
- 0