Oh, I assumed this was about a season of a show and was about to answer: GoT before it became US TV tropes rather than Martin subversion of tropes.
Having snuck that criticism in so subtly, I used to think it was summer. I have spent the happiest months of my life abroad (in asia and NZ, and I was fit as a fiddle. Coming home feels like a return to the tedious reality of life, the dull job you spend 5/7 of your life doing, and it kills me slowly, day by day. Now summer is torture, it should be spent outside but it is spent in an office! So winter.