Wow! Our weather here is also completely crazy, crazy hot that is! I'm sitting now typing on my computer, stuck to my leather couch, because it's 32C, 40C with the heat index! We're in hay fever season, a time when I would keep windows closed as much as possible, but now I have to open everything. Now I'm hot & sticky from the temp, I sneeze, have itchy eyes, congested sinus and a slight headache...
Right now I'd probably take your 4C, but I know I shouldn't complain too much, winter will be here soon enough!