The Altcoin Season Index has dropped to 27, underscoring a market shift towards Bitcoin dominance. This index, which evaluates the 90-day performance of the top 100 cryptocurrencies against Bitcoin, suggests that fewer than 75% of altcoins have outperformed Bitcoin recently. A reading of 75 or higher typically indicates an altcoin season. The current low score reflects Bitcoin's strong performance, increased risk aversion, and a lack of significant catalysts for altcoins.