Cellulite never takes a break, and unfortunately it doesn't hibernate! Even if you're going to wrap yourself up in multiple layers all winter, carry on the fight against orange peel - it won't disappear just because it's hidden away. Take care of your skin by exfoliating and moisturising; take draining supplements and drinks regularly (green tea, birch, cherry stones, etc); eat anti-cellulite foods such as pineapple and grapes; and use gels or creams containing active ingredients that unblock tissue, fight fat storage and firm the skin.
If you have the means, you could also invest in machines such as the Cellu M6 to help you in the battle against cellulite.