It's not a standard collocation with an obvious meaning. You would need context to understand what the writer meant.

Can you give the context? It is difficult to answer the question on its own. "A force of..." is only really used in a few particular expressions. For example, "a force of nature" (someone with a strong personality and lots of energy), "forces of evil" (something that is a bad influence e.g. drugs). Perhaps then, "A force of cold" means someone who is cold (unfeeling, unemotional) and who is bringing this influence to the situation? It is not something I have heard said before.