South Union weather by month
What a typical year looks like in South Union, South Carolina: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at CLEMSON UNIVERSITY, 24 km from South Union; records cover 1896–2026.
The year at a glance
- Precipitation a year
- 52.4 in1330 mm
- Snow a year
- 2.2 in5.6 cm
- Last spring freeze
- Mar 28
- First fall freeze
- Nov 3
- Heating degree days
- 2,990
- Cooling degree days
- 1,743
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 19°−7° (heating, 99%) and 98°37° (cooling, 1%).
Month by month
South Union in January
Highs average 53°12° and lows 33°0°, with 4.9 in125 mm of precipitation and 0.8 in2 cm of snow in a typical January.
- Record high
- 80°27° (1949)
- Record low
- −5°−21° (1940)
- Heating degree days
- 684
- Cooling degree days
- 0
South Union in February
Highs average 57°14° and lows 35°1°, with 4.4 in111 mm of precipitation and 0.8 in2 cm of snow in a typical February.
- Record high
- 82°28° (1930)
- Record low
- −7°−22° (1899)
- Heating degree days
- 537
- Cooling degree days
- 1
South Union in March
Highs average 65°18° and lows 41°5°, with 4.8 in122 mm of precipitation and 0.3 in0.8 cm of snow in a typical March.
- Record high
- 89°32° (1929)
- Record low
- 4°−16° (1980)
- Heating degree days
- 392
- Cooling degree days
- 8
South Union in April
Highs average 73°23° and lows 48°9°, with 4.2 in107 mm of precipitation in a typical April.
- Record high
- 93°34° (1925)
- Record low
- 24°−4° (1900)
- Heating degree days
- 169
- Cooling degree days
- 41
South Union in May
Highs average 81°27° and lows 57°14°, with 4.1 in103 mm of precipitation in a typical May.
- Record high
- 100°38° (1941)
- Record low
- 32°0° (1989)
- Heating degree days
- 39
- Cooling degree days
- 160
South Union in June
Highs average 88°31° and lows 65°18°, with 4.2 in106 mm of precipitation in a typical June.
- Record high
- 105°41° (1952)
- Record low
- 42°6° (1903)
- Heating degree days
- 2
- Cooling degree days
- 342
South Union in July
Highs average 91°33° and lows 69°20°, with 4.1 in104 mm of precipitation in a typical July.
- Record high
- 106°41° (2012)
- Record low
- 49°9° (1933)
- Heating degree days
- 0
- Cooling degree days
- 457
South Union in August
Highs average 90°32° and lows 68°20°, with 5.3 in134 mm of precipitation in a typical August.
- Record high
- 104°40° (1925)
- Record low
- 52°11° (1927)
- Heating degree days
- 0
- Cooling degree days
- 422
South Union in September
Highs average 84°29° and lows 62°17°, with 3.8 in97 mm of precipitation in a typical September.
- Record high
- 104°40° (1925)
- Record low
- 34°1° (1967)
- Heating degree days
- 10
- Cooling degree days
- 252
South Union in OctoberThis month
Highs average 74°24° and lows 50°10°, with 3.8 in96 mm of precipitation in a typical October.
- Record high
- 98°37° (1954)
- Record low
- 23°−5° (1954)
- Heating degree days
- 143
- Cooling degree days
- 54
South Union in November
Highs average 64°18° and lows 40°4°, with 3.9 in98 mm of precipitation in a typical November.
- Record high
- 86°30° (1931)
- Record low
- 10°−12° (1903)
- Heating degree days
- 398
- Cooling degree days
- 5
South Union in December
Highs average 56°13° and lows 34°1°, with 5.1 in129 mm of precipitation and 0.3 in0.8 cm of snow in a typical December.
- Record high
- 81°27° (1931)
- Record low
- 2°−17° (1962)
- Heating degree days
- 616
- Cooling degree days
- 1