Hall of Famer
Why not ever SIJ in which the J is June or July - just to give the northern hemisphere a break?
But on the flip side where it's summer here in Australia, using just the one lens in summer can also be restricting in circumstances where the weather's fine and excellent light is available most of the day; I want to use all of my lenses/ cameras to get the most out of it but will be stuck with just the one during the challenge. I can see myself in certain situations thinking "if only I had (xxx piece of equipment), that would have been great". Using just the one bit of gear in winter would suit me fine.