On December 4, data from Coinmarketcap showed that the Altcoin Season Index reported at 89, up 3 points from the previous day, setting a new high for the year. The index shows that in the past 90 days, about 89 of the top 100 cryptocurrencies by market value have outperformed Bitcoin.
It is reported that CMC's Cryptocurrency Altcoin Season Index is a real-time indicator used to judge whether the current cryptocurrency market is in an altcoin-dominated season. This index is based on the performance of the top 100 altcoins relative to Bitcoin over the past 90 days.