I have been trying for a while to find good info about the effect of MJO on CONUS temps. Found a good citation using my student access via the NCSU library (yay library fees)
Zhou, S., L’Heureux, M., Weaver, S., Kumar, A., (2011). A composite study of the MJO influence on the surface air temperature and precipitation over the Continental United States. Climate Dynamics, 38, 1459-1471
So this article shows why everyone on this thread likes phases 8 - 1- 2 so much. Interestingly, it again shows that we tend to do better with low amplitude in those phases.