Does double cleansing is required in winters???

I double cleanse when I feel like my skin needs it. I would definitely do so more during summer just because you tend to get more sweaty and grimey then. I don't wear make-up much but if I did wear make-up everyday I would double cleanse then too. So... to answer your question, probably less so in winter myself but there are reasons why you might want to.

it depends, if ure skin still looks oily or u feel it not clean, ofc u can proceed for double cleanse