A set of 36 perpetual-season simulations with an atmospheric GCM are used to investigate the effects of precession and obliquity variations on mid-Cretaceous climate. Climatic variables such as surface temperature, pressure and moisture transport suggests that the mid-Cretaceous climate system is more sensitive to precession than to obliquity in most regions, even at high latitudes. Obliquity variations affect our simulations primarily by modulating the western extent of the precession-enhanced continental monsoons. As a result, sensitivity to obliquity can be important at low, as well as high, latitudes. ¿American Geophysical Union 1990