Bitcoin has historically performed poorly in the third quarter, with average returns of +5% and median returns of -4%.On the other hand, the fourth quarter has been the best period for Bitcoin, with average returns of +89% and median returns of +57%.Analysts believe that the worst time for Bitcoin investors is over and that the best lies ahead.Bitcoin's price has experienced a sudden burst of bullish momentum, surging over 5% to reach the $60,900 level.