http://www.bom.gov.au/climate/enso/

La Niña conditions strengthened across the tropical Pacific Basin
during November. Climate models surveyed by the Bureau suggest the La Niña is
likely to peak during the next month and last at least until the end of summer.

Atmospheric indicators of ENSO, including the Southern Oscillation
Index (SOI), trade winds and cloudiness, all displayed some strengthening over
the past fortnight, with the current SOI value of +15 being the highest since
the breakdown of the 2010-11 event in May 2011. Similarly, the classic La Niña
ocean patterns in the tropical Pacific have become more clearly defined over the
past month. Despite this strengthening, the La Niña remains weaker than at the
same time in 2010. Australia’s climate has responded to these recent changes,
with above average rainfall across large parts of the north and west of the
country since October.