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Landrum, SC Weather. The average temperature of Landrum is 55.62Â°F, which is much lower than the South Carolina average temperature of 61.70Â°F and is higher than the national average temperature of 54.45Â°F. Topics: Heating Cost Index Cooling Cost Index Historical Temperature Historical Precipitation Historical Snow Historical Humidity Historical Wind Speed
In the summer, South Carolina is hot and humid with temperatures during the day averaging near 90 Â°F (32 Â°C) across most of the state with overnight lows near 70 Â°F (21 Â°C).Winter temperatures are much less uniform.orldwide climate classifications. South Carolina has a humid subtropical climate, with hot summers and mild winters. On average, between 40 inches (1,000 mm) and 80 inches (2,000 mm) of precipitation falls annually across the state.