by Cap Allon, October 4, 2019 in Electroverse
New Zealand’s average temperature last month –for the country as a whole– was below the 1981-2010 September avg., Niwa has said in its Monthly Climate Summary.
An unusual warming of the atmosphere high above Antarctica –called a Sudden Stratospheric Warming event (SSW)– assisted in making last month the fourth coldest September in New Zealand this century.
There have only ever been two SSWs recorded in the Southern Hemisphere, previous to this years — one in September 2002 (major) and another in September 2010 (minor).
The 2002 SSW event resulted in New Zealand experiencing a significant cold outbreak in October while the 2010 event was associated with record rainfall during September.