In this country, it starts in late November and doesn't end until mid-February. It's when the networks dig out the stuff that flopped and run it in prime time, and all the beginner presenters get their chance in front of a camera. Those of us without decent internet streaming options can either drag out all the stuff we recorded off-air during the year, or forget TV altogether and find other things to do, which is not so difficult in summer.
I watch almost no TV 'live' when the programmes are broadcast. Nearly everything I watch is stuff I've downloaded. I have pretty much complete control over what I see. I might watch episode 1 of something lame from time to time. I have thus eradicated such phenomena as the "TV silly season" from my life.