De Smet weather by month
What a typical year looks like in De Smet, South Dakota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at De Smet, 0 km from De Smet; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 25.9 in659 mm
- Snow a year
- 41 in105 cm
- Last spring freeze
- May 7
- First fall freeze
- Oct 4
- Heating degree days
- 8,152
- Cooling degree days
- 547
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −15°−26° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
De Smet in January
Highs average 23°−5° and lows 5°−15°, with 0.6 in15 mm of precipitation and 6 in16 cm of snow in a typical January.
- Record high
- 65°18° (1981)
- Record low
- −44°−42° (1912)
- Heating degree days
- 1579
- Cooling degree days
- 0
De Smet in February
Highs average 29°−2° and lows 9°−13°, with 0.88 in22 mm of precipitation and 9 in23 cm of snow in a typical February.
- Record high
- 68°20° (1931)
- Record low
- −40° (1899)
- Heating degree days
- 1292
- Cooling degree days
- 0
De Smet in March
Highs average 41°5° and lows 21°−6°, with 1.4 in35 mm of precipitation and 7 in18 cm of snow in a typical March.
- Record high
- 88°31° (1943)
- Record low
- −26°−32° (1913)
- Heating degree days
- 1062
- Cooling degree days
- 0
De Smet in April
Highs average 55°13° and lows 33°1°, with 2.3 in58 mm of precipitation and 5 in12 cm of snow in a typical April.
- Record high
- 96°36° (1980)
- Record low
- −3°−19° (1975)
- Heating degree days
- 628
- Cooling degree days
- 1
De Smet in May
Highs average 67°19° and lows 45°7°, with 3.3 in84 mm of precipitation in a typical May.
- Record high
- 105°41° (1934)
- Record low
- 11°−12° (2002)
- Heating degree days
- 294
- Cooling degree days
- 23
De Smet in June
Highs average 77°25° and lows 56°13°, with 4.1 in103 mm of precipitation in a typical June.
- Record high
- 110°43° (1936)
- Record low
- 27°−3° (1895)
- Heating degree days
- 62
- Cooling degree days
- 107
De Smet in July
Highs average 82°28° and lows 61°16°, with 3.9 in99 mm of precipitation in a typical July.
- Record high
- 111°44° (1934)
- Record low
- 32°0° (1895)
- Heating degree days
- 15
- Cooling degree days
- 209
De Smet in August
Highs average 79°26° and lows 59°15°, with 3.1 in78 mm of precipitation in a typical August.
- Record high
- 108°42° (1934)
- Record low
- 30°−1° (1893)
- Heating degree days
- 28
- Cooling degree days
- 152
De Smet in September
Highs average 72°22° and lows 50°10°, with 2.8 in71 mm of precipitation in a typical September.
- Record high
- 105°41° (1895)
- Record low
- 14°−10° (1893)
- Heating degree days
- 176
- Cooling degree days
- 52
De Smet in OctoberThis month
Highs average 57°14° and lows 36°2°, with 2 in50 mm of precipitation and 1.6 in4.1 cm of snow in a typical October.
- Record high
- 93°34° (1947)
- Record low
- −8°−22° (1925)
- Heating degree days
- 580
- Cooling degree days
- 3
De Smet in November
Highs average 41°5° and lows 22°−6°, with 0.96 in24 mm of precipitation and 5 in14 cm of snow in a typical November.
- Record high
- 80°27° (1893)
- Record low
- −18°−28° (1898)
- Heating degree days
- 1010
- Cooling degree days
- 0
De Smet in December
Highs average 28°−2° and lows 10°−12°, with 0.74 in19 mm of precipitation and 7 in19 cm of snow in a typical December.
- Record high
- 64°18° (1941)
- Record low
- −34°−37° (2016)
- Heating degree days
- 1426
- Cooling degree days
- 0