Porcupine weather by month
What a typical year looks like in Porcupine, South Dakota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Kyle 2 E, 25 km from Porcupine; records cover 1956–2026.
The year at a glance
- Precipitation a year
- 21.6 in548 mm
- Snow a year
- Rare
- Last spring freeze
- May 17
- First fall freeze
- Sep 20
- Heating degree days
- 7,116
- Cooling degree days
- 706
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −14°−26° (heating, 99%) and 100°38° (cooling, 1%).
Month by month
Porcupine in January
Highs average 37°3° and lows 11°−12°, with 0.69 in18 mm of precipitation in a typical January.
- Record high
- 77°25° (2015)
- Record low
- −37°−38° (2024)
- Heating degree days
- 1277
- Cooling degree days
- 0
Porcupine in February
Highs average 39°4° and lows 14°−10°, with 0.58 in15 mm of precipitation in a typical February.
- Record high
- 74°23° (2017)
- Record low
- −31°−35° (2025)
- Heating degree days
- 1089
- Cooling degree days
- 0
Porcupine in March
Highs average 50°10° and lows 22°−6°, with 1.3 in33 mm of precipitation in a typical March.
- Record high
- 89°32° (2026)
- Record low
- −26°−32° (1998)
- Heating degree days
- 902
- Cooling degree days
- 0
Porcupine in April
Highs average 59°15° and lows 30°−1°, with 2.4 in60 mm of precipitation in a typical April.
- Record high
- 92°33° (2026)
- Record low
- −4°−20° (2020)
- Heating degree days
- 613
- Cooling degree days
- 1
Porcupine in May
Highs average 69°21° and lows 42°5°, with 3.6 in90 mm of precipitation in a typical May.
- Record high
- 103°39° (1969)
- Record low
- 16°−9° (2013)
- Heating degree days
- 315
- Cooling degree days
- 24
Porcupine in June
Highs average 80°26° and lows 53°11°, with 3.5 in88 mm of precipitation in a typical June.
- Record high
- 106°41° (2018)
- Record low
- 21°−6° (1969)
- Heating degree days
- 73
- Cooling degree days
- 104
Porcupine in July
Highs average 88°31° and lows 59°15°, with 2.7 in68 mm of precipitation in a typical July.
- Record high
- 111°44° (2012)
- Record low
- 36°2° (1959)
- Heating degree days
- 7
- Cooling degree days
- 259
Porcupine in August
Highs average 88°31° and lows 57°14°, with 2.6 in65 mm of precipitation in a typical August.
- Record high
- 110°43° (2012)
- Record low
- 32°0° (1964)
- Heating degree days
- 22
- Cooling degree days
- 239
Porcupine in September
Highs average 79°26° and lows 46°8°, with 1.5 in38 mm of precipitation in a typical September.
- Record high
- 103°39° (1971)
- Record low
- 13°−11° (1972)
- Heating degree days
- 150
- Cooling degree days
- 75
Porcupine in OctoberThis month
Highs average 64°18° and lows 33°0°, with 1.7 in42 mm of precipitation in a typical October.
- Record high
- 95°35° (1963)
- Record low
- −6°−21° (2020)
- Heating degree days
- 523
- Cooling degree days
- 4
Porcupine in November
Highs average 49°10° and lows 21°−6°, with 0.71 in18 mm of precipitation in a typical November.
- Record high
- 82°28° (2020)
- Record low
- −29°−34° (1959)
- Heating degree days
- 904
- Cooling degree days
- 0
Porcupine in December
Highs average 38°3° and lows 12°−11°, with 0.52 in13 mm of precipitation in a typical December.
- Record high
- 72°22° (2025)
- Record low
- −29°−34° (2016)
- Heating degree days
- 1241
- Cooling degree days
- 0