The Altcoin Season Index has reached a historic low of 17, indicating that only 17 out of the top 100 altcoins have outperformed Bitcoin over the past 90 days. This decline highlights the ongoing bearish trend in the altcoin market, with significant cryptocurrencies experiencing substantial losses. Ethereum, for instance, has fallen by 28.30%, underperforming Bitcoin's 21.10% decline. The index, which measures the performance of altcoins relative to Bitcoin, suggests a continued bear phase in the market. Typically, an altcoin season is characterized by a score of 75 or higher, underscoring the current challenging environment for altcoins.