As my father used to say, "Dropping like a turd from a tall cow".*
Just so you are oriented, here are the El Nino/Southern Oscillation (ENSO) areas, 3.4 being the most important for our general purposes:
First up Climate Observations Nino 3.4 temperature anomaly chart:
NINO3.4 SST Anomaly
Monthly Change = -0.36 deg C
Here's his global SST chart:
Weekly Global SST Anomalies
Mr. Tisdale has many, many more charts at his Climate Observations blog.
Going back to La niña, here is NOAA's Earth Systems Research Laboratory's Multivariate ENSO Index (MEI):
El Niño/Southern Oscillation (ENSO) is the most important coupled ocean-atmosphere phenomenon to cause global climate variability on interannual time scales. Here we attempt to monitor ENSO by basing the Multivariate ENSO Index (MEI) on the six main observed variables over the tropical Pacific....MUCH MORE
*Dad was a city boy. The closest to a cow he ever got was a tax shelter back in the '80's. One spring he decided to drive out to South Dakota to check on his investment. He met the ranch foreman on a hill overlooking hundreds of bovines and asked "Which ones are mine?".
The foreman said "None of 'em, yours all died"
The "tall cow" line was pretty much all he got out of the experience, other than the write-off.