After about 10 minutes they got cold and went inside. Unfortunately, I was only about 1/10 through shoveling, so I had to stay outside in the BITTER cold and shovel for another hour. (I'd driven on our driveway, so a lot of this time was spent scraping off the tire track ice).
And you know what? It was time well spent. I sometimes love quiet repetitive jobs, because my brain can wander wherever I need it to go. I've written many scenes in my head while shoveling snow, driving, mowing the lawn, and doing dishes.
I am kind of envying you Australians--with your nice warm (or miserably hot) winters, but I'll take the bitter cold and snow if it means productive writing time.
Do you ever write in your head while you work? When is your most productive thinking time?