Ethereum's historical average monthly return in January is 20.63%, while Bitcoin's average monthly return in January is 3.81%.

According to Coinglass data, Ethereum's average January return since 2016 is +20.63%, with a median January return of +31.92%. Over the past nine years, January has seen five increases and four decreases.

Furthermore, since 2013, Bitcoin's average January return has been +3.81%, with a median January return of +0.62%. Over the past 13 years, January has seen 7 months of gains and 6 months of losses.