My summer drams are Ardbeg Very Young, Balvenie PortWood, Bruichladdich Links Turnberry, Bruichladdich "The Tonga Valinch", Cadenheads Clynelish 12, Glenrothes 1992, Highland Park 25, and Signatory Vintage Islay 5yo cs...because that's what I happen to have open. If my turnover were fast enough to actually plan for seasonal drinking, I suppose I'd choose to have a Bruichladdich 10, Scapa 14, some Rosebank or other, and a nice calvados.
On a warm, sweaty evening last week, I had a Lagavulin 16, just because it was there. So I guess I really don't think that way. I tend to agree that I am less inclined to drink whisky at all in hot weather, but, judging from my intake the past few weeks, not that much less inclined.