I would be surprised if you lost more than one energy per event phase to scorching weather.
However, I lack the rules quote to prove that.
We ended up doing as you said, and only lost one energy. I am surprised with the lack of discussion about some of these cards, many of which are somewhat vague. I hate to post all the questions I had, with the main reason that it might spoil some of the surprises of the game. I really enjoy it, but the lack of clarity slows it down at times. Hopefully patience for me will pay off, and more posts will pop up.