The share price of Tesla (NASDAQ: TSLA) is entering what has historically been its most challenging period of the year.According to 15 years of seasonality data, August through October have consistently delivered some of the weakest returns for the electric vehicle stock, with only 46%, 40%, and 33% of those months showing positive performance, respectively, according to charting platform TrendSpider.Tesla stock 15-year seasonality chart. Source: TrendSpiderThis seasonal slump coincides with broader investo ...