Mitty,
A few years ago I picked up a C-182 that had been parked in the shade of a
hangar and shielded from the morning sun. What I found out was that there
was frozen moisture in the pitot tube. It had frozen during the night and
had not yet thawed in the morning.

A no-airspeed takeoff is not necessarily a problem but it does remind you
that preflight pitot heat on cool mornings is not a bad
idea.

gene Whitt