User blog comment:ArtDraw12/TD Theories: Who May Return in Potential Future Seasons?/@comment-2156422-20161006225529/@comment-11883116-20161008130206

I guess that's because no season took place in winter. Most of them were during summer and TDWT was during spring (episode 23 is on April Fools).

We had a Christmas themed trailer though. It's on Fresh TV's YouTube channel.