Sherman weather by month
What a typical year looks like in Sherman, South Dakota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Sioux Falls 14 Nne, 12 km from Sherman; records cover 2002–2026.
The year at a glance
- Precipitation a year
- 29.6 in752 mm
- Snow a year
- Rare
- Last spring freeze
- May 3
- First fall freeze
- Oct 3
- Heating degree days
- 7,785
- Cooling degree days
- 593
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 93°34° (cooling, 1%).
Month by month
Sherman in January
Highs average 24°−4° and lows 6°−14°, with 0.71 in18 mm of precipitation in a typical January.
- Record high
- 63°17° (2012)
- Record low
- −31°−35° (2010)
- Heating degree days
- 1540
- Cooling degree days
- 0
Sherman in February
Highs average 29°−2° and lows 11°−12°, with 0.89 in23 mm of precipitation in a typical February.
- Record high
- 67°19° (2024)
- Record low
- −24°−31° (2021)
- Heating degree days
- 1264
- Cooling degree days
- 0
Sherman in March
Highs average 42°5° and lows 23°−5°, with 1.8 in46 mm of precipitation in a typical March.
- Record high
- 87°31° (2026)
- Record low
- −20°−29° (2019)
- Heating degree days
- 1012
- Cooling degree days
- 0
Sherman in April
Highs average 57°14° and lows 34°1°, with 3.3 in83 mm of precipitation in a typical April.
- Record high
- 91°33° (2007)
- Record low
- 5°−15° (2018)
- Heating degree days
- 591
- Cooling degree days
- 2
Sherman in May
Highs average 69°21° and lows 47°8°, with 3.8 in96 mm of precipitation in a typical May.
- Record high
- 98°37° (2018)
- Record low
- 23°−5° (2005)
- Heating degree days
- 251
- Cooling degree days
- 34
Sherman in June
Highs average 79°26° and lows 58°14°, with 5 in127 mm of precipitation in a typical June.
- Record high
- 99°37° (2025)
- Record low
- 41°5° (2009)
- Heating degree days
- 41
- Cooling degree days
- 135
Sherman in July
Highs average 83°28° and lows 61°16°, with 3.4 in87 mm of precipitation in a typical July.
- Record high
- 103°39° (2012)
- Record low
- 43°6° (2013)
- Heating degree days
- 9
- Cooling degree days
- 215
Sherman in August
Highs average 80°26° and lows 59°15°, with 3.2 in82 mm of precipitation in a typical August.
- Record high
- 101°38° (2012)
- Record low
- 40°4° (2004)
- Heating degree days
- 25
- Cooling degree days
- 153
Sherman in September
Highs average 73°23° and lows 49°10°, with 3.1 in78 mm of precipitation in a typical September.
- Record high
- 97°36° (2023)
- Record low
- 27°−3° (2012)
- Heating degree days
- 164
- Cooling degree days
- 50
Sherman in OctoberThis month
Highs average 59°15° and lows 37°3°, with 2.3 in58 mm of precipitation in a typical October.
- Record high
- 92°33° (2023)
- Record low
- 3°−16° (2020)
- Heating degree days
- 537
- Cooling degree days
- 4
Sherman in November
Highs average 42°6° and lows 23°−5°, with 1.3 in32 mm of precipitation in a typical November.
- Record high
- 80°27° (2020)
- Record low
- −9°−23° (2014)
- Heating degree days
- 969
- Cooling degree days
- 0
Sherman in December
Highs average 29°−2° and lows 12°−11°, with 0.86 in22 mm of precipitation in a typical December.
- Record high
- 59°15° (2012)
- Record low
- −29°−34° (2016)
- Heating degree days
- 1382
- Cooling degree days
- 0