Yesterday  it got all the way up to -4C!  The hottest it got between Wednesday (when we got home) and the day before yesterday was -9C.  Now it's -10.5C.  The coldest it's been since we got home was -20C, which is even negative in Fahrenheit.
Today was the first day of the semester, and tomorrow is the first day I have class.  I haven't felt as unenthusiastic about a semester starting for a long time, if ever.