Increased interest in my Audio system during the fall

Yes. During spring and summer I tend to feel guilty if I spend evening/sunset hours inside listening when I could be outside. Winter, when it gets dark at 5, is impetus to do a lot more guilt free listening while I grade essays. 

Same for me, just like my automobile interest kicks in every April

The only time I am not interested in music is when I'm depressed which in me is not seasonal. I have to send myself somewhere else usually by book. The last episode I must have read 200 books and I did not touch the Hi Fi for about a year. The system runs every day when I get home from work till bedtime. Serious listening is from 7 to 9 PM weekdays and variable on the weekends. I have systems in the garage and workshop but that is not serious listening. In order to avoid depression I have to keep busy. Between Hi Fi, two 911's and the workshop I manage pretty well. My wife can tell when I'm getting into trouble. I start reading.

i get more interested in my rig between 130 and 345 pm

It's just you.

The Fall is when they revealed the new equipment models. Also, cooler weather means dwelling indoors more and going to audio shops.
This doesn't apply as much these days but probably ingrained in your internal rhythms. 

^^^Yes!
My interest peaks on a winter’s night after a fresh snowfall and at about 3AM.

Think about it.

My interest by season is inversely proportional to the temperature of my basement.