Last year was also the winter of retreating highs. That helps the marine air penetrate further inland. A decent high position would have resulted in much different weather where you are.
We have friends that live in Exeter, but formerly Epping. I recall one time back in 2013 right when I got to 101 there was just a semblance of frozen translucent crust. As I looked west on 101 from that spot, I could see the snow cover maybe 2 miles away. So I know what you mean with the sharp gradients.