Most indices dropped slightly from record February values. But as expected, the global NOAA index held up, and was even slightly warner, at 1.22°C vs 1.19 in Feb. That is the highest anomaly in the record for any month.
I'll show my now usual comparison with 1997/8::
There is a maintained collection of these plots that you can flick through here. In 1998, March fell back from the Feb peak, but here it has risen. HADsst3 is out too, with a rise, which is interesting. February SST dropped, causing some chatter about rapid El Nino decline, but this was premature. I'll show the comparison below the fold.