Usually squirrel activity becomes frantic on warmer March days. Admittedly there haven't been many days getting into the 50's, but it is extraordinary that I haven't seen a single squirrel since Dec. The absence is apparent at most sites I've been to recently.
I'm guessing that 2 years of failed acorn crop may have decimated the local population. The only fear is that there will be no crop until next Sept so any survivors will be after green peaches and pears with a vengeance.