This study examines differences in MJO event climatology as a function of ENSO phase in observations and numerical models. Specifically, we examine those models with good MJO simulations from the recent MJO Task Force and GEWEX Atmosphere System Study (GASS) intercomparison project, in addition to the low-order MJO skeleton model developed by Majda and Stechmann (2009, 2011). Preliminary observational results indicate that MJO events are shorter-lived during El Niño, in agreement with previous work. There is also a relative increase in the number of individually occurring MJOs compared to neutral or La Niña conditions. The frequency of MJOs and corresponding event lengths are less sensitive to tropical sea surface temperatures (SSTs) in the low-order model, though the skeleton model demonstrates additional eastward propagation with enhanced MJO variance over the central Pacific when using El Niño SSTs. Similar results are found when forcing the skeleton model with ENSO-varying profiles of radiative cooling and low-level moistening, again consistent with observations. Time permitting, changes to the simulated and observed MJO climatology as a function of the IOD are also discussed.