Ortley weather by month
What a typical year looks like in Ortley, South Dakota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Webster, 25 km from Ortley; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 26.1 in662 mm
- Snow a year
- 43 in109 cm
- Last spring freeze
- May 6
- First fall freeze
- Oct 7
- Heating degree days
- 8,600
- Cooling degree days
- 529
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 92°33° (cooling, 1%).
Month by month
Ortley in January
Highs average 20°−6° and lows 2°−16°, with 0.84 in21 mm of precipitation and 10 in24 cm of snow in a typical January.
- Record high
- 64°18° (1981)
- Record low
- −36°−38° (1894)
- Heating degree days
- 1661
- Cooling degree days
- 0
Ortley in February
Highs average 25°−4° and lows 6°−14°, with 0.75 in19 mm of precipitation and 8 in20 cm of snow in a typical February.
- Record high
- 64°18° (1958)
- Record low
- −43°−42° (1895)
- Heating degree days
- 1378
- Cooling degree days
- 0
Ortley in March
Highs average 38°3° and lows 19°−7°, with 1.1 in28 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 81°27° (2012)
- Record low
- −32°−36° (1896)
- Heating degree days
- 1133
- Cooling degree days
- 0
Ortley in April
Highs average 53°12° and lows 32°0°, with 2.2 in56 mm of precipitation and 5 in13 cm of snow in a typical April.
- Record high
- 96°36° (1980)
- Record low
- −6°−21° (1975)
- Heating degree days
- 679
- Cooling degree days
- 1
Ortley in May
Highs average 66°19° and lows 45°7°, with 3.4 in86 mm of precipitation in a typical May.
- Record high
- 97°36° (1894)
- Record low
- 18°−8° (1967)
- Heating degree days
- 308
- Cooling degree days
- 22
Ortley in June
Highs average 76°24° and lows 56°13°, with 4 in101 mm of precipitation in a typical June.
- Record high
- 105°41° (1988)
- Record low
- 23°−5° (1897)
- Heating degree days
- 70
- Cooling degree days
- 101
Ortley in July
Highs average 81°27° and lows 61°16°, with 4 in102 mm of precipitation in a typical July.
- Record high
- 108°42° (1894)
- Record low
- 36°2° (1895)
- Heating degree days
- 17
- Cooling degree days
- 203
Ortley in August
Highs average 79°26° and lows 59°15°, with 3 in75 mm of precipitation in a typical August.
- Record high
- 104°40° (1959)
- Record low
- 26°−3° (1895)
- Heating degree days
- 30
- Cooling degree days
- 154
Ortley in September
Highs average 71°22° and lows 50°10°, with 2.6 in65 mm of precipitation in a typical September.
- Record high
- 104°40° (1895)
- Record low
- 17°−8° (1895)
- Heating degree days
- 191
- Cooling degree days
- 45
Ortley in OctoberThis month
Highs average 55°13° and lows 36°2°, with 2.5 in63 mm of precipitation and 1.4 in3.6 cm of snow in a typical October.
- Record high
- 91°33° (1963)
- Record low
- −1°−18° (1895)
- Heating degree days
- 606
- Cooling degree days
- 3
Ortley in November
Highs average 39°4° and lows 21°−6°, with 0.71 in18 mm of precipitation and 6 in15 cm of snow in a typical November.
- Record high
- 80°27° (1893)
- Record low
- −29°−34° (1896)
- Heating degree days
- 1048
- Cooling degree days
- 0
Ortley in December
Highs average 25°−4° and lows 9°−13°, with 1.1 in27 mm of precipitation and 8 in20 cm of snow in a typical December.
- Record high
- 63°17° (1894)
- Record low
- −34°−37° (1967)
- Heating degree days
- 1479
- Cooling degree days
- 0