Shannon Colony weather by month
What a typical year looks like in Shannon 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 Howard, 9 km from Shannon Colony; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 26.4 in669 mm
- Snow a year
- 36 in91 cm
- Last spring freeze
- May 6
- First fall freeze
- Oct 4
- Heating degree days
- 7,457
- Cooling degree days
- 777
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −17°−27° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Shannon Colony in January
Highs average 29°−2° and lows 5°−15°, with 0.63 in16 mm of precipitation and 6 in15 cm of snow in a typical January.
- Record high
- 63°17° (1931)
- Record low
- −46°−43° (1916)
- Heating degree days
- 1493
- Cooling degree days
- 0
Shannon Colony in February
Highs average 34°1° and lows 9°−13°, with 0.67 in17 mm of precipitation and 6 in16 cm of snow in a typical February.
- Record high
- 70°21° (1958)
- Record low
- −42°−41° (1899)
- Heating degree days
- 1217
- Cooling degree days
- 0
Shannon Colony in March
Highs average 47°8° and lows 21°−6°, with 1.4 in35 mm of precipitation and 7 in17 cm of snow in a typical March.
- Record high
- 89°32° (1943)
- Record low
- −24°−31° (1913)
- Heating degree days
- 968
- Cooling degree days
- 0
Shannon Colony in April
Highs average 61°16° and lows 32°0°, with 2.7 in68 mm of precipitation and 5 in13 cm of snow in a typical April.
- Record high
- 96°36° (1980)
- Record low
- 1°−17° (1936)
- Heating degree days
- 560
- Cooling degree days
- 2
Shannon Colony in May
Highs average 73°23° and lows 45°7°, with 3.9 in99 mm of precipitation in a typical May.
- Record high
- 109°43° (1934)
- Record low
- 16°−9° (1946)
- Heating degree days
- 238
- Cooling degree days
- 41
Shannon Colony in June
Highs average 82°28° and lows 56°13°, with 3.7 in94 mm of precipitation in a typical June.
- Record high
- 108°42° (1931)
- Record low
- 19°−7° (1901)
- Heating degree days
- 38
- Cooling degree days
- 160
Shannon Colony in July
Highs average 87°31° and lows 60°16°, with 3.5 in89 mm of precipitation in a typical July.
- Record high
- 113°45° (1934)
- Record low
- 34°1° (1912)
- Heating degree days
- 7
- Cooling degree days
- 279
Shannon Colony in August
Highs average 85°29° and lows 58°14°, with 2.9 in73 mm of precipitation in a typical August.
- Record high
- 113°45° (1934)
- Record low
- 26°−3° (1902)
- Heating degree days
- 17
- Cooling degree days
- 210
Shannon Colony in September
Highs average 77°25° and lows 48°9°, with 3 in75 mm of precipitation in a typical September.
- Record high
- 106°41° (1895)
- Record low
- 13°−11° (1899)
- Heating degree days
- 142
- Cooling degree days
- 79
Shannon Colony in OctoberThis month
Highs average 63°17° and lows 35°2°, with 2.4 in60 mm of precipitation and 1 in2.5 cm of snow in a typical October.
- Record high
- 95°35° (1910)
- Record low
- −11°−24° (1925)
- Heating degree days
- 506
- Cooling degree days
- 6
Shannon Colony in November
Highs average 47°8° and lows 21°−6°, with 1 in26 mm of precipitation and 3 in8 cm of snow in a typical November.
- Record high
- 80°27° (2020)
- Record low
- −23°−31° (1897)
- Heating degree days
- 927
- Cooling degree days
- 0
Shannon Colony in December
Highs average 33°1° and lows 10°−12°, with 0.69 in18 mm of precipitation and 8 in19 cm of snow in a typical December.
- Record high
- 67°19° (1939)
- Record low
- −36°−38° (1917)
- Heating degree days
- 1344
- Cooling degree days
- 0