So I like to go outside for a morning coffee with a cigarette. In winter here it's usually between -5C to -25C, and sometimes it gets down to -30C and colder. Assuming that my coffee is about 75-80C, what are the chances that the coffee mug will shatter in the cold?
My mug is made from some kind of organic glass with a seam in the middle like it's two halves glued together.
I don't know if this question is serious enough for this site, but, basically, I wanted to know which precautions should I take to avoid breaking the mug?