Opheim weather by month
What a typical year looks like in Opheim, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Opheim 10 N, 16 km from Opheim; records cover 1959–2025.
The year at a glance
- Precipitation a year
- 14.4 in367 mm
- Snow a year
- 33 in84 cm
- Last spring freeze
- May 29
- First fall freeze
- Sep 4
- Heating degree days
- 9,604
- Cooling degree days
- 210
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −28°−33° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Opheim in January
Highs average 22°−6° and lows 1°−17°, with 0.27 in6.9 mm of precipitation and 5 in11 cm of snow in a typical January.
- Record high
- 56°13° (1981)
- Record low
- −50°−46° (1969)
- Heating degree days
- 1668
- Cooling degree days
- 0
Opheim in February
Highs average 26°−4° and lows 4°−16°, with 0.37 in9.4 mm of precipitation and 6 in16 cm of snow in a typical February.
- Record high
- 64°18° (1992)
- Record low
- −51°−46° (1962)
- Heating degree days
- 1406
- Cooling degree days
- 0
Opheim in March
Highs average 38°3° and lows 15°−9°, with 0.43 in11 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 73°23° (1993)
- Record low
- −37°−38° (2002)
- Heating degree days
- 1194
- Cooling degree days
- 0
Opheim in April
Highs average 54°12° and lows 26°−3°, with 0.91 in23 mm of precipitation and 2.5 in6.4 cm of snow in a typical April.
- Record high
- 91°33° (1980)
- Record low
- −18°−28° (1975)
- Heating degree days
- 750
- Cooling degree days
- 0
Opheim in May
Highs average 65°19° and lows 36°2°, with 2.1 in53 mm of precipitation and 0.9 in2.3 cm of snow in a typical May.
- Record high
- 98°37° (1988)
- Record low
- 8°−13° (1984)
- Heating degree days
- 445
- Cooling degree days
- 3
Opheim in June
Highs average 73°23° and lows 46°8°, with 3.7 in94 mm of precipitation in a typical June.
- Record high
- 105°41° (1988)
- Record low
- 20°−7° (1998)
- Heating degree days
- 189
- Cooling degree days
- 21
Opheim in July
Highs average 81°27° and lows 50°10°, with 2.3 in57 mm of precipitation in a typical July.
- Record high
- 103°39° (1975)
- Record low
- 29°−2° (1967)
- Heating degree days
- 67
- Cooling degree days
- 89
Opheim in August
Highs average 81°27° and lows 49°9°, with 1.6 in40 mm of precipitation in a typical August.
- Record high
- 104°40° (1983)
- Record low
- 25°−4° (1980)
- Heating degree days
- 86
- Cooling degree days
- 84
Opheim in September
Highs average 70°21° and lows 39°4°, with 1.4 in35 mm of precipitation and 0.2 in0.5 cm of snow in a typical September.
- Record high
- 98°37° (1978)
- Record low
- 2°−17° (1995)
- Heating degree days
- 325
- Cooling degree days
- 13
Opheim in OctoberThis month
Highs average 54°12° and lows 28°−2°, with 0.82 in21 mm of precipitation and 1.2 in3 cm of snow in a typical October.
- Record high
- 89°32° (1992)
- Record low
- −19°−28° (1991)
- Heating degree days
- 743
- Cooling degree days
- 0
Opheim in November
Highs average 37°3° and lows 15°−9°, with 0.36 in9.1 mm of precipitation and 5 in13 cm of snow in a typical November.
- Record high
- 76°24° (1999)
- Record low
- −32°−36° (1985)
- Heating degree days
- 1164
- Cooling degree days
- 0
Opheim in December
Highs average 25°−4° and lows 4°−15°, with 0.27 in6.9 mm of precipitation and 7 in18 cm of snow in a typical December.
- Record high
- 55°13° (1962)
- Record low
- −49°−45° (2017)
- Heating degree days
- 1567
- Cooling degree days
- 0