Of the narrow band of land that will experience the eclipse in its totality in South Carolina, Columbia (43 percent) ranks below Clemson (75 percent), Greer (65 percent) and Charleston (53 percent) for likely favorable viewing conditions. The higher the percentage, the better the chance that the skies will be “clear enough for the eclipse to be visible.” Those percentages are “an estimate of average conditions, not a guarantee for this year.”