Thank you for your question. I am sorry that the assigned expert has been unavailable to answer it. Much of what goes on in the summer goes on in the winter, as well, but not at the same pace. I am assuming you are talking about outdoor composting, rather than worm composting, that needs to be in a warmer environment. Here is an Extension publication that provides direction to you during the colder months: http://essex.cce.cornell.edu/resources/compost-winter-composting
I hope you find this helpful. Good luck!