Ok I agree, the mild temperature is the only weak point:) Still Paris creates the almost perfect Christmas feeling. I can only say: Being in the city this time of the year is magical. And in all fairness it is nice walking around when it’s not that cold.
Seriously: I had no idea how beautiful Paris is decorated, how many buildings tastefully arrange their festive decor and how many (!!) restaurants “dive” into the season. Once you started to pay close attention you can’t stop discovering another nice, cosy and stylish place to stop.