Unfortunately not, no. There’s several technical reasons for it. One being that we operate with static satellite imagery and not season based Would be cool further down the road ofc but it’s a different story.
Unfortunately the Infinite Flight team don’t tend to add Christmas lights to buildings or planes, nor do they make the map look all snowy because at the end of the day, this is a simulator and maintaining the realism of the simulator is important.
That being said however, there are plenty of community events that are normally created celebrating the festivities that you’re more than welcome to participate in. Additionally, there is a good chance that there will be some official event held as well that is Christmas themed such as a group flight or flash flight.
Keep an eye on the Live > Events category for any Christmas themed events that you would like to participate in.