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September 2012 Ties For Hottest On Record Worldwide October 19, 2012
NOAA Temperature Graphic.
There has not been a September in modern history that was hotter than the one just ended.
For the third time since the year 2000, the world set or tied the record for the hottest September since reliable observations began in 1880.

The U.S. agency NOAA calculated the worldwide average temperature for the month at 60.2 degrees Fahrenheit, which was 1.2 degrees above normal.

That tied 2005 for the hottest September and also made it the 331st consecutive month that global temperatures were above the 20th-century average.

One exception was the United Kingdom, which experienced its coolest September since 1994.

Alaska had its fifth-wettest September since records began in 1918, according to NOAA.

Australia recorded its warmest September days on record, with the monthly high temperature average reaching 3.5 degrees Fahrenheit above normal.

The month’s warmth coincided with Arctic sea ice melting to its greatest extent on record, while its Antarctic counterpart grew to a record expanse.

The latter was in large part due to the annual peak of the ozone hole above the frozen continent and increased polar surface winds collecting the sea ice.

Graphic: NOAA