Riverview Colony weather by month
What a typical year looks like in Riverview Colony, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Tiber Dam, 15 km from Riverview Colony; records cover 1952–2026.
The year at a glance
- Precipitation a year
- 10.2 in258 mm
- Snow a year
- Rare
- Last spring freeze
- May 13
- First fall freeze
- Sep 22
- Heating degree days
- 7,753
- Cooling degree days
- 353
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −21°−29° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Riverview Colony in January
Highs average 31°0° and lows 8°−13°, with 0.36 in9.1 mm of precipitation in a typical January.
- Record high
- 70°21° (1992)
- Record low
- −53°−47° (1954)
- Heating degree days
- 1400
- Cooling degree days
- 0
Riverview Colony in February
Highs average 37°3° and lows 12°−11°, with 0.21 in5.3 mm of precipitation in a typical February.
- Record high
- 74°23° (1992)
- Record low
- −40° (1994)
- Heating degree days
- 1144
- Cooling degree days
- 0
Riverview Colony in March
Highs average 48°9° and lows 20°−7°, with 0.34 in8.6 mm of precipitation in a typical March.
- Record high
- 81°27° (2004)
- Record low
- −32°−36° (1960)
- Heating degree days
- 955
- Cooling degree days
- 0
Riverview Colony in April
Highs average 59°15° and lows 30°−1°, with 0.98 in25 mm of precipitation in a typical April.
- Record high
- 89°32° (1987)
- Record low
- −13°−25° (1975)
- Heating degree days
- 609
- Cooling degree days
- 0
Riverview Colony in May
Highs average 69°20° and lows 40°4°, with 1.4 in35 mm of precipitation in a typical May.
- Record high
- 95°35° (1980)
- Record low
- 14°−10° (1954)
- Heating degree days
- 340
- Cooling degree days
- 7
Riverview Colony in June
Highs average 76°25° and lows 48°9°, with 2.3 in57 mm of precipitation in a typical June.
- Record high
- 103°39° (1990)
- Record low
- 30°−1° (2009)
- Heating degree days
- 128
- Cooling degree days
- 40
Riverview Colony in July
Highs average 85°30° and lows 53°12°, with 1.1 in27 mm of precipitation in a typical July.
- Record high
- 107°42° (2024)
- Record low
- 36°2° (1980)
- Heating degree days
- 30
- Cooling degree days
- 154
Riverview Colony in August
Highs average 85°29° and lows 51°11°, with 1.1 in27 mm of precipitation in a typical August.
- Record high
- 107°42° (1961)
- Record low
- 29°−2° (1992)
- Heating degree days
- 44
- Cooling degree days
- 130
Riverview Colony in September
Highs average 74°23° and lows 43°6°, with 0.91 in23 mm of precipitation in a typical September.
- Record high
- 99°37° (1981)
- Record low
- 16°−9° (1995)
- Heating degree days
- 222
- Cooling degree days
- 21
Riverview Colony in OctoberThis month
Highs average 60°15° and lows 32°0°, with 0.75 in19 mm of precipitation in a typical October.
- Record high
- 94°34° (1992)
- Record low
- −13°−25° (1991)
- Heating degree days
- 596
- Cooling degree days
- 1
Riverview Colony in November
Highs average 44°7° and lows 21°−6°, with 0.45 in11 mm of precipitation in a typical November.
- Record high
- 78°26° (1961)
- Record low
- −28°−33° (1985)
- Heating degree days
- 969
- Cooling degree days
- 0
Riverview Colony in December
Highs average 34°1° and lows 12°−11°, with 0.38 in9.7 mm of precipitation in a typical December.
- Record high
- 68°20° (1991)
- Record low
- −45°−43° (1968)
- Heating degree days
- 1316
- Cooling degree days
- 0