I wouldn't worry about that at all. We have 7 months of winter and a month before and after of freezing-melting waves, and I shoot in all conditions. That body-lens combo is weather sealed.
Granted, there's hardly any humidity here, but I still have to consider bringing the camera out in the cold and then back inside on many days - but as long as I let the camera warm back up and dry out before I turn it on, I have never had problems no matter how cold it has been (as cold as -36 celsius).