I watch TNG about exactly the other way. It has to be summer, sunny and afternoon. Most likely because I got my first TNG episodes on tape in the 90s after some work in the summer. After picking them up from post office it was a sunny afternoon. So, everytime I watch TNG it has to be sunny afternoon. It became my thing and my tradition. And I love summer.
That means that there's still time, little bit over half a year, for the next TNG episodes for me. Well, harder to learn the favourite episodes inside out since I watch them usually once a year. Fortunately there are other programs for Christmas time, season 1 of 24 @ December. That's because there was 24 day 1 marathon on 26th of December in 2003 and it stuck.
How fascinating to see that we each have our favourite times and space to watch TNG according to the way we got sucked into it, I love hearing your experiences. I find them so personal and interesting.