NOAA La Niña Page

  La Niña is associated with cooler than normal water temperatures in the Equatorial Pacific Ocean, unlike El Niño which is associated with warmer than normal water.

La Niña (December 2000)
El Niño (December 1997)
El Niño (December 1997) (March 2002)

SST anomalies (°C)
Sea surface temperature anomalies (°C)