Currently about 50% of the top 50 altcoins have outperformed BTC the past 3 months. Generally, a number above 75%+ is indicated by alt season. The last time we had this was right before the all time high in September. Many alts have been holding their ground against BTC recently, but on the other hand many have also continued bleeding. Pretty much the same story we've seen the past 2 years.(Daan Crypto Trades)