You have committed to a marathon. Which means you have committed to marathon training. Yes you knew it would be cold outside... hell you live in Maryland... its cold in the winter! But its only a short period of your day. You will be happy with yourself when its done. You bought cute warm running gear. GET OUTSIDE and GET THE damn 6 miles in! 6 miles is nothing - you have successfully ran an awesome half marathon... GET MOVING.
And on a side note - just because you are off and the hubby is off and you are spending time as a family does NOT mean eating out 3 meals a day and splurging!