According to the user's guide, it is supposed to com 50% charged, but the first thing you will see when you power it up is a screen instructing you to plug in the charger.
Figuring what the temperature is like over most of the country this time of year, I would plug it in anyway just on general principles. Most batteries do not like the cold.
As long as you are using the wall charger, you can still play with it while it charges.