Grass Ranch Colony weather by month
What a typical year looks like in Grass Ranch Colony, South Dakota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Academy 2ne, 23 km from Grass Ranch Colony; records cover 1898–2026.
The year at a glance
- Precipitation a year
- 24 in609 mm
- Snow a year
- 42 in105 cm
- Last spring freeze
- May 5
- First fall freeze
- Oct 6
- Heating degree days
- 7,117
- Cooling degree days
- 859
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −13°−25° (heating, 99%) and 100°38° (cooling, 1%).
Month by month
Grass Ranch Colony in January
Highs average 30°−1° and lows 11°−12°, with 0.51 in13 mm of precipitation and 6 in15 cm of snow in a typical January.
- Record high
- 72°22° (1931)
- Record low
- −37°−38° (1912)
- Heating degree days
- 1386
- Cooling degree days
- 0
Grass Ranch Colony in February
Highs average 35°2° and lows 14°−10°, with 0.58 in15 mm of precipitation and 8 in20 cm of snow in a typical February.
- Record high
- 78°26° (1930)
- Record low
- −36°−38° (1905)
- Heating degree days
- 1138
- Cooling degree days
- 0
Grass Ranch Colony in March
Highs average 46°8° and lows 24°−5°, with 1.1 in28 mm of precipitation and 7 in17 cm of snow in a typical March.
- Record high
- 92°33° (1943)
- Record low
- −23°−31° (1962)
- Heating degree days
- 930
- Cooling degree days
- 0
Grass Ranch Colony in April
Highs average 58°14° and lows 35°2°, with 2.7 in68 mm of precipitation and 7 in17 cm of snow in a typical April.
- Record high
- 98°37° (1980)
- Record low
- −4°−20° (1924)
- Heating degree days
- 564
- Cooling degree days
- 3
Grass Ranch Colony in May
Highs average 69°21° and lows 47°8°, with 3.5 in90 mm of precipitation in a typical May.
- Record high
- 108°42° (1934)
- Record low
- 18°−8° (1931)
- Heating degree days
- 256
- Cooling degree days
- 35
Grass Ranch Colony in June
Highs average 80°27° and lows 58°14°, with 3.9 in99 mm of precipitation in a typical June.
- Record high
- 111°44° (1936)
- Record low
- 32°0° (1946)
- Heating degree days
- 44
- Cooling degree days
- 158
Grass Ranch Colony in July
Highs average 87°30° and lows 63°17°, with 3 in77 mm of precipitation in a typical July.
- Record high
- 116°47° (1940)
- Record low
- 38°3° (1945)
- Heating degree days
- 7
- Cooling degree days
- 310
Grass Ranch Colony in August
Highs average 85°29° and lows 60°16°, with 3 in76 mm of precipitation in a typical August.
- Record high
- 115°46° (1934)
- Record low
- 32°0° (1935)
- Heating degree days
- 14
- Cooling degree days
- 247
Grass Ranch Colony in September
Highs average 77°25° and lows 51°10°, with 2.5 in65 mm of precipitation in a typical September.
- Record high
- 110°43° (1929)
- Record low
- 17°−8° (1899)
- Heating degree days
- 132
- Cooling degree days
- 98
Grass Ranch Colony in OctoberThis month
Highs average 62°16° and lows 37°3°, with 1.8 in46 mm of precipitation and 1.1 in2.8 cm of snow in a typical October.
- Record high
- 100°38° (1947)
- Record low
- −8°−22° (1925)
- Heating degree days
- 493
- Cooling degree days
- 8
Grass Ranch Colony in November
Highs average 46°8° and lows 25°−4°, with 0.8 in20 mm of precipitation and 5 in14 cm of snow in a typical November.
- Record high
- 87°31° (1999)
- Record low
- −20°−29° (1959)
- Heating degree days
- 885
- Cooling degree days
- 0
Grass Ranch Colony in December
Highs average 33°1° and lows 15°−10°, with 0.5 in13 mm of precipitation and 8 in21 cm of snow in a typical December.
- Record high
- 74°23° (1998)
- Record low
- −31°−35° (1917)
- Heating degree days
- 1268
- Cooling degree days
- 0