Colstrip weather by month
What a typical year looks like in Colstrip, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Colstrip, 0 km from Colstrip; records cover 1927–2026.
The year at a glance
- Precipitation a year
- 16.4 in417 mm
- Snow a year
- 37 in93 cm
- Last spring freeze
- May 13
- First fall freeze
- Sep 30
- Heating degree days
- 7,369
- Cooling degree days
- 508
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −14°−26° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Colstrip in January
Highs average 36°2° and lows 14°−10°, with 0.65 in17 mm of precipitation and 7 in19 cm of snow in a typical January.
- Record high
- 69°21° (1931)
- Record low
- −42°−41° (1930)
- Heating degree days
- 1251
- Cooling degree days
- 0
Colstrip in February
Highs average 37°3° and lows 15°−9°, with 0.69 in18 mm of precipitation and 7 in19 cm of snow in a typical February.
- Record high
- 72°22° (1982)
- Record low
- −50°−46° (1936)
- Heating degree days
- 1089
- Cooling degree days
- 0
Colstrip in March
Highs average 47°8° and lows 24°−5°, with 0.95 in24 mm of precipitation and 6 in14 cm of snow in a typical March.
- Record high
- 81°27° (2004)
- Record low
- −28°−33° (1945)
- Heating degree days
- 915
- Cooling degree days
- 0
Colstrip in April
Highs average 55°13° and lows 32°0°, with 1.9 in49 mm of precipitation and 3 in8 cm of snow in a typical April.
- Record high
- 90°32° (1939)
- Record low
- −13°−25° (1936)
- Heating degree days
- 641
- Cooling degree days
- 0
Colstrip in May
Highs average 65°18° and lows 42°5°, with 3.1 in80 mm of precipitation and 0.5 in1.3 cm of snow in a typical May.
- Record high
- 99°37° (1934)
- Record low
- 13°−11° (1954)
- Heating degree days
- 368
- Cooling degree days
- 8
Colstrip in June
Highs average 75°24° and lows 51°10°, with 2.5 in63 mm of precipitation in a typical June.
- Record high
- 108°42° (1936)
- Record low
- 28°−2° (1964)
- Heating degree days
- 123
- Cooling degree days
- 58
Colstrip in July
Highs average 85°29° and lows 57°14°, with 1.4 in36 mm of precipitation in a typical July.
- Record high
- 110°43° (1936)
- Record low
- 34°1° (1951)
- Heating degree days
- 24
- Cooling degree days
- 213
Colstrip in August
Highs average 84°29° and lows 55°13°, with 1 in26 mm of precipitation in a typical August.
- Record high
- 111°44° (1961)
- Record low
- 33°1° (1966)
- Heating degree days
- 40
- Cooling degree days
- 183
Colstrip in September
Highs average 73°23° and lows 46°8°, with 1.4 in36 mm of precipitation and 0.2 in0.5 cm of snow in a typical September.
- Record high
- 105°41° (2022)
- Record low
- 5°−15° (1984)
- Heating degree days
- 206
- Cooling degree days
- 44
Colstrip in OctoberThis month
Highs average 58°15° and lows 34°1°, with 1.4 in37 mm of precipitation and 2.3 in5.8 cm of snow in a typical October.
- Record high
- 94°34° (1963)
- Record low
- −8°−22° (1991)
- Heating degree days
- 594
- Cooling degree days
- 2
Colstrip in November
Highs average 46°8° and lows 24°−5°, with 0.69 in18 mm of precipitation and 4 in10 cm of snow in a typical November.
- Record high
- 80°27° (1999)
- Record low
- −32°−36° (1959)
- Heating degree days
- 908
- Cooling degree days
- 0
Colstrip in December
Highs average 37°3° and lows 15°−9°, with 0.56 in14 mm of precipitation and 6 in16 cm of snow in a typical December.
- Record high
- 74°23° (1939)
- Record low
- −38°−39° (1983)
- Heating degree days
- 1210
- Cooling degree days
- 0