BlockBeats News, on September 12, according to Coinmarketcap data, the Altcoin Season Index rose to 66 today, maintaining a near 90-day high, higher than last week's average of 52 and last month's average of 34.
This index indicates that in the past 90 days, about 66 out of the top 100 cryptocurrencies by market capitalization have outperformed bitcoin.