On July 29, according to data from Coinmarketcap, the Altcoin Season Index has dropped to 39, after reaching 55 on July 21. The index shows that in the past 90 days, about 39 out of the top 100 cryptocurrencies by market capitalization have outperformed Bitcoin. Note: The CMC Altcoin Season Index is a real-time indicator used to determine whether the current cryptocurrency market is in an altcoin-dominated season. The index is based on the performance of the top 100 altcoins relative to Bitcoin over the past 90 days.