Here we get average winter temps in Feb of between -8 to -15, put any water on glass that's not just above freezing and it turns to ice within a second. Glass doesn't shatter or crack though, but who wants to scrape ice of a window?
Because of this, I use cold water trad and leave my water container full on my patio, ready for the next day. I only get problems with ice on windows at below -4, or if I use warm water.