The Altcoin Season Index has dropped to 48, according to CoinMarketCap data, marking a significant decline from its peak of 78 on September 20. This index measures the performance of the top 100 cryptocurrencies by market cap against Bitcoin over the past 90 days. The current reading suggests that only 48 of these altcoins have outperformed Bitcoin, indicating a shift in market dominance back towards Bitcoin. The Altcoin Season Index is a real-time metric that helps investors assess whether the market is favoring altcoins or Bitcoin. The recent decline reflects Bitcoin's strengthening position in the market, as it outperforms a majority of altcoins.