A "non gusty" approach is normally at 1.3 times stall - which would be 1.3 X 38 in the figures you gave - say 50 mph (assuming the 38 mph is in landing config)
With gusting I would add 5 knots (6 mph) to that (to be exact you need to know the headwind component of the gusts and apply a little formula to calculate the required "overspeed") but 6 mph should be OK for gusts of up to 10 - 12 knots over the steady headwind component.
Last edited by Choxolate; 2nd Sep 2009 at 15:33.
Reason: Change knots to mph and correct spelling mistakes