We get minus 15 and 20 a bit this time of year. Last night minus 5. Yet it is nighttime when we get it.. and mind you is is a whole new meaning of COLD!!!!
I remember delivering newspapers as a kid in daytime temps of minus 15 F. in Idaho Falls, ID. We got some really bad winters back then. In Havre, MT where a friend grew up, minus 40 was considered to be great ice-skating weather if the sun was shining.