AO will finish above 1.00 for February and March.. The last 2 times that happened were 2015 and 1997, 2 Strongest Nino's. 1982, the third Strongest, was two months above 0.97.
89-90 and 90-91 did and they both had -SOI or -NOI something characteristics of the phase.. 67-68 is the other example and that was a Weak Nino. Two months above 0.9 includes 02-03 which was Moderate El Nino, and 92-93 which I consider a Weak Nino (subsurface). 8/8 had something-characteristics-aspects of the phase in my opinion.