The guy on NBC10 (not Bouchard) mentioned the seasonal trend and the ocean temps as reasons for conservative forecast for the coastal area. Everyone has also mentioned that it is early and all this could change..
I don't know but it will matter the most on pavement, grass will still accumulate at marginal temps.
This could be why so few metro schools have called as.of now. They still have time to see what's on the ground early AM.