It's frickin' freezing down here.
One has to remember, btw, that Australian houses are designed to leak like sieves to get rid of heat.
So no comments about "Eee up! When we were lads and lasses we had to endure -40C!" or "You call that cold? We live in Ann Arbor, Michigan and that's bikini weather!" (I lived there once: Winter 1985 so I'm not talking out of my ass)
It's all relative.
And just for the record, the lowest temperature for this specific day right here was set in 2004 and was 3.8C.
Having said that, I'm seriously considering getting double glazing.