According to data from Coinmarketcap reveals that the Altcoin Season Index has decreased to 45 as of August 20. Earlier, on August 11, the index had dropped to 29. This index indicates that in the past 90 days, approximately 45 out of the top 100 cryptocurrencies by market capitalization have outperformed Bitcoin.The CMC Altcoin Season Index is a real-time metric used to assess whether the cryptocurrency market is currently in an altcoin-dominated season. It is based on the performance of the top 100 altcoins relative to Bitcoin over the past 90 days.