Egan weather by month
What a typical year looks like in Egan, South Dakota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Flandreau, 6 km from Egan; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 28.5 in724 mm
- Snow a year
- 40 in103 cm
- Last spring freeze
- May 4
- First fall freeze
- Sep 29
- Heating degree days
- 8,375
- Cooling degree days
- 514
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −19°−28° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Egan in January
Highs average 23°−5° and lows 4°−16°, with 0.54 in14 mm of precipitation and 6 in15 cm of snow in a typical January.
- Record high
- 64°18° (1981)
- Record low
- −40° (1974)
- Heating degree days
- 1610
- Cooling degree days
- 0
Egan in February
Highs average 28°−2° and lows 7°−14°, with 0.76 in19 mm of precipitation and 8 in21 cm of snow in a typical February.
- Record high
- 70°21° (1958)
- Record low
- −38°−39° (1899)
- Heating degree days
- 1336
- Cooling degree days
- 0
Egan in March
Highs average 40°4° and lows 19°−7°, with 1.3 in34 mm of precipitation and 6 in16 cm of snow in a typical March.
- Record high
- 87°31° (1943)
- Record low
- −24°−31° (1948)
- Heating degree days
- 1101
- Cooling degree days
- 0
Egan in April
Highs average 54°12° and lows 31°0°, with 2.7 in68 mm of precipitation and 5 in12 cm of snow in a typical April.
- Record high
- 94°34° (1910)
- Record low
- −2°−19° (1975)
- Heating degree days
- 664
- Cooling degree days
- 1
Egan in May
Highs average 67°19° and lows 45°7°, with 4.1 in105 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 106°41° (1934)
- Record low
- 16°−9° (1946)
- Heating degree days
- 309
- Cooling degree days
- 26
Egan in June
Highs average 77°25° and lows 56°13°, with 4.5 in115 mm of precipitation in a typical June.
- Record high
- 105°41° (1931)
- Record low
- 29°−2° (1901)
- Heating degree days
- 65
- Cooling degree days
- 109
Egan in July
Highs average 81°27° and lows 60°16°, with 3.8 in97 mm of precipitation in a typical July.
- Record high
- 112°44° (1940)
- Record low
- 35°2° (1927)
- Heating degree days
- 18
- Cooling degree days
- 192
Egan in August
Highs average 79°26° and lows 57°14°, with 3.6 in91 mm of precipitation in a typical August.
- Record high
- 108°42° (1936)
- Record low
- 32°0° (1935)
- Heating degree days
- 38
- Cooling degree days
- 135
Egan in September
Highs average 72°22° and lows 48°9°, with 3.1 in78 mm of precipitation in a typical September.
- Record high
- 104°40° (1895)
- Record low
- 15°−9° (1899)
- Heating degree days
- 196
- Cooling degree days
- 47
Egan in OctoberThis month
Highs average 58°15° and lows 34°1°, with 2.2 in56 mm of precipitation and 1.2 in3 cm of snow in a typical October.
- Record high
- 94°34° (1897)
- Record low
- −12°−24° (1925)
- Heating degree days
- 586
- Cooling degree days
- 4
Egan in November
Highs average 41°5° and lows 21°−6°, with 1 in26 mm of precipitation and 6 in14 cm of snow in a typical November.
- Record high
- 79°26° (1909)
- Record low
- −20°−29° (1964)
- Heating degree days
- 1012
- Cooling degree days
- 0
Egan in December
Highs average 28°−2° and lows 10°−12°, with 0.85 in22 mm of precipitation and 9 in22 cm of snow in a typical December.
- Record high
- 65°18° (1922)
- Record low
- −35°−37° (1917)
- Heating degree days
- 1440
- Cooling degree days
- 0