Reference

La Niña & El Niño

La Niña is characterized by unusually cold ocean temperatures in the equatorial Pacific, as compared to El Niño, which is characterized by unusually warm ocean temperatures in the equatorial Pacific

Sites

* El Niño
From Environment Canada, includes El Niño history and science, Canadian and worldwide effects, its current status and forecast, and La Niña facts.
* NIWA National Climate Centre
The National Climate Centre (NCC) provides regular public information on current climate conditions across New Zealand including soil moisture and river flows, and outlooks for coming seasons. Scientists at the Centre keep track of global influences on New Zealand's climate, particularly the El Niño–La Niña cycle and sea surface temperatures.
* NOAA El Niño page
From National Oceanic and Atmospheric Administration
* NOAA La Niña page
From National Oceanic and Atmospheric Administration