Greycliff weather by month
What a typical year looks like in Greycliff, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Big Timber, 16 km from Greycliff; records cover 1894–2026.
The year at a glance
- Precipitation a year
- 16.9 in430 mm
- Snow a year
- 55 in139 cm
- Last spring freeze
- May 12
- First fall freeze
- Sep 22
- Heating degree days
- 6,911
- Cooling degree days
- 374
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −12°−24° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Greycliff in January
Highs average 38°3° and lows 20°−7°, with 0.73 in19 mm of precipitation and 7 in18 cm of snow in a typical January.
- Record high
- 78°26° (1922)
- Record low
- −36°−38° (1917)
- Heating degree days
- 1122
- Cooling degree days
- 0
Greycliff in February
Highs average 40°4° and lows 20°−7°, with 0.65 in17 mm of precipitation and 11 in27 cm of snow in a typical February.
- Record high
- 72°22° (1950)
- Record low
- −47°−44° (1936)
- Heating degree days
- 985
- Cooling degree days
- 0
Greycliff in March
Highs average 49°10° and lows 26°−3°, with 0.98 in25 mm of precipitation and 9 in23 cm of snow in a typical March.
- Record high
- 80°27° (1928)
- Record low
- −32°−36° (2019)
- Heating degree days
- 848
- Cooling degree days
- 0
Greycliff in April
Highs average 57°14° and lows 32°0°, with 2.2 in55 mm of precipitation and 4 in9 cm of snow in a typical April.
- Record high
- 89°32° (1962)
- Record low
- −10°−23° (1936)
- Heating degree days
- 612
- Cooling degree days
- 0
Greycliff in May
Highs average 67°19° and lows 40°5°, with 3.1 in78 mm of precipitation and 0.6 in1.5 cm of snow in a typical May.
- Record high
- 97°36° (1919)
- Record low
- 10°−12° (1954)
- Heating degree days
- 364
- Cooling degree days
- 5
Greycliff in June
Highs average 76°24° and lows 48°9°, with 2.6 in67 mm of precipitation in a typical June.
- Record high
- 106°41° (1919)
- Record low
- 26°−3° (1968)
- Heating degree days
- 134
- Cooling degree days
- 39
Greycliff in July
Highs average 86°30° and lows 54°12°, with 1.4 in35 mm of precipitation in a typical July.
- Record high
- 110°43° (1931)
- Record low
- 33°1° (1915)
- Heating degree days
- 21
- Cooling degree days
- 171
Greycliff in August
Highs average 85°29° and lows 51°11°, with 0.99 in25 mm of precipitation in a typical August.
- Record high
- 107°42° (1929)
- Record low
- 28°−2° (1910)
- Heating degree days
- 38
- Cooling degree days
- 134
Greycliff in September
Highs average 74°23° and lows 43°6°, with 1.3 in33 mm of precipitation and 0.5 in1.3 cm of snow in a typical September.
- Record high
- 100°38° (1931)
- Record low
- 12°−11° (1926)
- Heating degree days
- 210
- Cooling degree days
- 23
Greycliff in OctoberThis month
Highs average 59°15° and lows 34°1°, with 1.5 in38 mm of precipitation and 5 in12 cm of snow in a typical October.
- Record high
- 88°31° (1920)
- Record low
- −14°−26° (1919)
- Heating degree days
- 569
- Cooling degree days
- 2
Greycliff in November
Highs average 46°8° and lows 26°−3°, with 0.78 in20 mm of precipitation and 8 in20 cm of snow in a typical November.
- Record high
- 78°26° (1965)
- Record low
- −29°−34° (1959)
- Heating degree days
- 872
- Cooling degree days
- 0
Greycliff in December
Highs average 37°3° and lows 20°−7°, with 0.73 in19 mm of precipitation and 10 in26 cm of snow in a typical December.
- Record high
- 80°27° (1897)
- Record low
- −38°−39° (1923)
- Heating degree days
- 1136
- Cooling degree days
- 0