Blackhawk weather by month
What a typical year looks like in Blackhawk, South Dakota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Rapid City WFO, 13 km from Blackhawk; records cover 1888–2026.
The year at a glance
- Precipitation a year
- 20 in509 mm
- Snow a year
- 54 in136 cm
- Last spring freeze
- May 10
- First fall freeze
- Oct 4
- Heating degree days
- 6,845
- Cooling degree days
- 679
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −9°−23° (heating, 99%) and 98°37° (cooling, 1%).
Month by month
Blackhawk in January
Highs average 37°3° and lows 16°−9°, with 0.31 in7.9 mm of precipitation and 5 in13 cm of snow in a typical January.
- Record high
- 73°23° (2002)
- Record low
- −33°−36° (1916)
- Heating degree days
- 1198
- Cooling degree days
- 0
Blackhawk in February
Highs average 38°3° and lows 18°−8°, with 0.53 in13 mm of precipitation and 9 in23 cm of snow in a typical February.
- Record high
- 74°23° (1930)
- Record low
- −34°−37° (1899)
- Heating degree days
- 1039
- Cooling degree days
- 0
Blackhawk in March
Highs average 47°9° and lows 26°−4°, with 0.94 in24 mm of precipitation and 10 in26 cm of snow in a typical March.
- Record high
- 85°29° (1910)
- Record low
- −17°−27° (1891)
- Heating degree days
- 884
- Cooling degree days
- 0
Blackhawk in April
Highs average 55°13° and lows 34°1°, with 2.3 in57 mm of precipitation and 10 in25 cm of snow in a typical April.
- Record high
- 91°33° (2026)
- Record low
- −8°−22° (1936)
- Heating degree days
- 616
- Cooling degree days
- 1
Blackhawk in May
Highs average 65°19° and lows 45°7°, with 4.1 in105 mm of precipitation and 2.2 in5.6 cm of snow in a typical May.
- Record high
- 99°37° (1969)
- Record low
- 19°−7° (1909)
- Heating degree days
- 327
- Cooling degree days
- 16
Blackhawk in June
Highs average 76°25° and lows 55°13°, with 3.3 in85 mm of precipitation and 0.1 in0.3 cm of snow in a typical June.
- Record high
- 106°41° (2012)
- Record low
- 31°−1° (1951)
- Heating degree days
- 84
- Cooling degree days
- 96
Blackhawk in July
Highs average 84°29° and lows 62°16°, with 2.6 in67 mm of precipitation in a typical July.
- Record high
- 110°43° (2026)
- Record low
- 40°4° (1959)
- Heating degree days
- 10
- Cooling degree days
- 257
Blackhawk in August
Highs average 83°29° and lows 60°16°, with 2.2 in55 mm of precipitation in a typical August.
- Record high
- 106°41° (1900)
- Record low
- 36°2° (1911)
- Heating degree days
- 18
- Cooling degree days
- 224
Blackhawk in September
Highs average 74°23° and lows 51°10°, with 1.4 in36 mm of precipitation and 0.1 in0.3 cm of snow in a typical September.
- Record high
- 103°39° (1960)
- Record low
- 15°−9° (1926)
- Heating degree days
- 157
- Cooling degree days
- 79
Blackhawk in OctoberThis month
Highs average 59°15° and lows 38°3°, with 1.5 in38 mm of precipitation and 3 in9 cm of snow in a typical October.
- Record high
- 96°36° (1892)
- Record low
- −13°−25° (1925)
- Heating degree days
- 522
- Cooling degree days
- 6
Blackhawk in November
Highs average 47°8° and lows 27°−3°, with 0.48 in12 mm of precipitation and 7 in17 cm of snow in a typical November.
- Record high
- 83°28° (1999)
- Record low
- −15°−26° (1959)
- Heating degree days
- 846
- Cooling degree days
- 0
Blackhawk in December
Highs average 38°3° and lows 19°−7°, with 0.37 in9.4 mm of precipitation and 7 in17 cm of snow in a typical December.
- Record high
- 79°26° (1939)
- Record low
- −28°−33° (1916)
- Heating degree days
- 1144
- Cooling degree days
- 0