Carter weather by month
What a typical year looks like in Carter, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Fort Benton, 21 km from Carter; records cover 1894–2026.
The year at a glance
- Precipitation a year
- 13.2 in336 mm
- Snow a year
- 38 in97 cm
- Last spring freeze
- May 13
- First fall freeze
- Sep 22
- Heating degree days
- 7,545
- Cooling degree days
- 427
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −20°−29° (heating, 99%) and 98°37° (cooling, 1%).
Month by month
Carter in January
Highs average 35°1° and lows 10°−12°, with 0.52 in13 mm of precipitation and 8 in20 cm of snow in a typical January.
- Record high
- 71°22° (1992)
- Record low
- −49°−45° (1969)
- Heating degree days
- 1322
- Cooling degree days
- 0
Carter in February
Highs average 38°3° and lows 13°−11°, with 0.44 in11 mm of precipitation and 7 in18 cm of snow in a typical February.
- Record high
- 77°25° (1992)
- Record low
- −45°−43° (1895)
- Heating degree days
- 1110
- Cooling degree days
- 0
Carter in March
Highs average 48°9° and lows 20°−6°, with 0.56 in14 mm of precipitation and 4 in11 cm of snow in a typical March.
- Record high
- 83°28° (2004)
- Record low
- −35°−37° (1897)
- Heating degree days
- 953
- Cooling degree days
- 0
Carter in April
Highs average 59°15° and lows 31°−1°, with 1.5 in38 mm of precipitation and 3 in8 cm of snow in a typical April.
- Record high
- 93°34° (1939)
- Record low
- −8°−22° (1975)
- Heating degree days
- 612
- Cooling degree days
- 0
Carter in May
Highs average 68°20° and lows 41°5°, with 2.1 in53 mm of precipitation and 0.3 in0.8 cm of snow in a typical May.
- Record high
- 97°36° (1980)
- Record low
- 14°−10° (1946)
- Heating degree days
- 335
- Cooling degree days
- 8
Carter in June
Highs average 76°25° and lows 49°9°, with 2.6 in67 mm of precipitation in a typical June.
- Record high
- 108°42° (1900)
- Record low
- 27°−3° (1895)
- Heating degree days
- 122
- Cooling degree days
- 46
Carter in July
Highs average 86°30° and lows 54°12°, with 1.2 in30 mm of precipitation in a typical July.
- Record high
- 107°42° (2026)
- Record low
- 34°1° (1944)
- Heating degree days
- 24
- Cooling degree days
- 187
Carter in August
Highs average 86°30° and lows 52°11°, with 1.2 in29 mm of precipitation in a typical August.
- Record high
- 109°43° (1940)
- Record low
- 29°−2° (1910)
- Heating degree days
- 43
- Cooling degree days
- 160
Carter in September
Highs average 74°23° and lows 42°6°, with 1.2 in30 mm of precipitation and 0.3 in0.8 cm of snow in a typical September.
- Record high
- 104°40° (2022)
- Record low
- 17°−8° (1985)
- Heating degree days
- 228
- Cooling degree days
- 25
Carter in OctoberThis month
Highs average 60°16° and lows 31°−1°, with 0.92 in23 mm of precipitation and 1.9 in4.8 cm of snow in a typical October.
- Record high
- 94°34° (1992)
- Record low
- −15°−26° (1991)
- Heating degree days
- 615
- Cooling degree days
- 1
Carter in November
Highs average 47°8° and lows 21°−6°, with 0.58 in15 mm of precipitation and 6 in14 cm of snow in a typical November.
- Record high
- 79°26° (1975)
- Record low
- −29°−34° (1985)
- Heating degree days
- 938
- Cooling degree days
- 0
Carter in December
Highs average 37°3° and lows 13°−10°, with 0.47 in12 mm of precipitation and 8 in20 cm of snow in a typical December.
- Record high
- 73°23° (1939)
- Record low
- −45°−43° (1983)
- Heating degree days
- 1243
- Cooling degree days
- 0