Bamboo
Carb icing can happen in summer just as much as winter (in fact more often I believe) Look at the safety sense leaflet on winter flying and piston engine icing from the SRG website (mail me if you can't find them - I have the PDFs). They're excellent.
I too had to wait 2 months to do my XQC - really frustrating and I sympathise. But I waited for a good day and really enjoyed it - I go so far as to say the best flying experience I've ever had. I think if I was worrying about the wx, I'd have ruined it.
Good luck when you go for it. When you get back, you really feel like a pilot.
bcfc