Winter can be factored into an over all plan.
Q: Does the weather and environment have any affect on game play?
A: Yes. The weather has a great impact on your economy and the global market. For example, in the winter, farms will become obsolete forcing human players to hunt or trade for food. At the same time, the price of food in the NPC markets will increase to meet the principles of supply-and-demand.
But what about the unexpected?
Will there be natural disasters that will impact your building or production?