Last week during the climb-out, I encountered clear-air windsheer (as
opposed to thunderstorm-induced windsheer) at about 4,500 feet above the
ground.

The airspeed indicator dropped 15 knots while my groundspeed increased.
After a minute or so, the airspeed indicator returned to its previous
value.

Once I leveled off, I called flight service and reported it. However,
is this really report-worthy? The reason for my question is the
relatively higher altitude at which I encountered the windsheer.

--
Peter