Bon Homme Colony weather by month
What a typical year looks like in Bon Homme 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 Tyndall, 20 km from Bon Homme Colony; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 26.2 in666 mm
- Snow a year
- 37 in93 cm
- Last spring freeze
- Apr 30
- First fall freeze
- Oct 9
- Heating degree days
- 7,258
- Cooling degree days
- 833
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 97°36° (cooling, 1%).
Month by month
Bon Homme Colony in January
Highs average 29°−2° and lows 9°−13°, with 0.57 in14 mm of precipitation and 7 in17 cm of snow in a typical January.
- Record high
- 71°22° (2012)
- Record low
- −38°−39° (1912)
- Heating degree days
- 1432
- Cooling degree days
- 0
Bon Homme Colony in February
Highs average 34°1° and lows 13°−11°, with 0.81 in21 mm of precipitation and 7 in19 cm of snow in a typical February.
- Record high
- 76°24° (2016)
- Record low
- −41° (1905)
- Heating degree days
- 1169
- Cooling degree days
- 0
Bon Homme Colony in March
Highs average 46°8° and lows 23°−5°, with 1.4 in34 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 96°36° (1943)
- Record low
- −19°−28° (1960)
- Heating degree days
- 946
- Cooling degree days
- 0
Bon Homme Colony in April
Highs average 58°15° and lows 34°1°, with 2.9 in73 mm of precipitation and 4 in10 cm of snow in a typical April.
- Record high
- 99°37° (1894)
- Record low
- −3°−19° (1936)
- Heating degree days
- 566
- Cooling degree days
- 3
Bon Homme Colony in May
Highs average 70°21° and lows 47°8°, with 4 in101 mm of precipitation and 0.2 in0.5 cm of snow in a typical May.
- Record high
- 107°42° (1934)
- Record low
- 20°−7° (1967)
- Heating degree days
- 246
- Cooling degree days
- 42
Bon Homme Colony in June
Highs average 81°27° and lows 58°15°, with 3.4 in86 mm of precipitation in a typical June.
- Record high
- 108°42° (1931)
- Record low
- 33°1° (1901)
- Heating degree days
- 39
- Cooling degree days
- 173
Bon Homme Colony in July
Highs average 86°30° and lows 63°17°, with 3.3 in85 mm of precipitation in a typical July.
- Record high
- 115°46° (1936)
- Record low
- 40°4° (1902)
- Heating degree days
- 6
- Cooling degree days
- 296
Bon Homme Colony in August
Highs average 83°29° and lows 60°16°, with 3.3 in83 mm of precipitation in a typical August.
- Record high
- 113°45° (1936)
- Record low
- 36°2° (1902)
- Heating degree days
- 15
- Cooling degree days
- 227
Bon Homme Colony in September
Highs average 76°24° and lows 51°10°, with 2.7 in69 mm of precipitation in a typical September.
- Record high
- 106°41° (1922)
- Record low
- 21°−6° (1899)
- Heating degree days
- 135
- Cooling degree days
- 85
Bon Homme Colony in OctoberThis month
Highs average 62°17° and lows 37°3°, with 2.2 in56 mm of precipitation and 0.8 in2 cm of snow in a typical October.
- Record high
- 98°37° (1947)
- Record low
- 4°−16° (1913)
- Heating degree days
- 497
- Cooling degree days
- 7
Bon Homme Colony in November
Highs average 46°8° and lows 24°−5°, with 1 in26 mm of precipitation and 5 in13 cm of snow in a typical November.
- Record high
- 84°29° (2009)
- Record low
- −19°−28° (1959)
- Heating degree days
- 908
- Cooling degree days
- 0
Bon Homme Colony in December
Highs average 33°0° and lows 14°−10°, with 0.78 in20 mm of precipitation and 7 in19 cm of snow in a typical December.
- Record high
- 70°21° (1939)
- Record low
- −36°−38° (1917)
- Heating degree days
- 1299
- Cooling degree days
- 0