Bitcoin experienced a significant decline in November, dropping 17.67%, marking its worst monthly performance since 2018, according to data from Coinglass. This downturn is reminiscent of the 36.57% decline seen in November 2018. Ethereum also faced a challenging month, with a 22.38% drop, its steepest since 2018. Despite the recent downturn, historical data suggests potential recovery in December, with Bitcoin averaging a 4.13% gain and Ethereum a 5.72% gain during this month. Investors will be watching closely to see if these trends hold true this year.