It means that the La Nina effects aren't completely negating the general warming trend. It was colder during the NH winter than average in many places, probably due to La Nina. March is a transition month, and because warming is causing an earlier spring, this earlier spring translates into a warmer month than average. If La Nina persists, its effect may be more noticeable in suppressing summer temperatures. We'll just have to observe the data.
Wait a second. Let me try to wrap my mind around this. La nina trends were negating your warming expectations in earlier months though, weren't they? Why wouldn't they still be negated?
It seems that if your la nina weather god made any sense at all that it could only be sucking in heat energy ( into the pacific ) and if you want to say that it has a trend of sucking heat energy into the oceans, you got to expect that the oceans have gained a lot of heat during this prolonged "la nina" event that you and your fellow disciples of Al Gore have been insisting on.
With an ocean that has been super heated, as would be expected during a prolonged "la nina" event like you've been insisting on, if such an event existed by the laws of thermodynamics, you should be expecting that heat to be violently decompressed back into the atmosphere as soon as your mythical la nina event ends. Wouldn't you agree?
By the way, you don't believe in "cold energy", do you? I read some nasa claim in a google cache ( the original text had been removed ) that stated "la nina" somehow churns up the cold from the deep ocean and cools the atmosphere with it. Insane stuff that my tax dollars pay for. Do you agree with the theory or do you have another explanation for how your la nina fallacy cools the earth? If so, be specific about what it does with the heat. Where does it hide or sequester it?