  We develop a finite temperature Hartree theory for the trapped dipolar Bose
gas. We use this theory to study thermal effects on the mechanical stability of
the system and density oscillating condensate states. We present results for
the stability phase diagram as a function of temperature and aspect ratio. In
oblate traps above the critical temperature for condensation we find that the
Hartree theory predicts significant stability enhancement over the
semiclassical result. Below the critical temperature we find that thermal
effects are well described by accounting for the thermal depletion of the
condensate. Our results also show that density oscillating condensate states
occur over a range of interaction strengths that broadens with increasing
temperature.
