Be afraid (but don't panic).
On the first day of spring, the only thing I was afraid of (maybe even a little panicked) was that I didn't have enough warm clothes. I was in Boston, mid-afternoon, and the thermometer on my dashboard registered in the low 30's—that would be Fahrenheit. Spring? I don't think so. I could see my breath, even though the sun was shining. A couple of days later, as my wife and I were walking across a college campus in Maine that our California-bred daughter was checking out before applying, it was even colder, right around 18°F with a b