In 143 years of September records, only September 2005 could match the past month for warmth averaged around the globe. September 2012’s global temperature was 1.21 degrees (F) above the 20th average, tied for the warmest on record.
It was the 36th straight September and 331st straight month with an above average global temperature.
For the year (January-September), the average global temperature ranks 8th warmest on record. Each of the last 6 months have all ranked among the top 5 warmest months on record.
Here are the month-by-month rankings:
* January: 19th warmest
* February 22nd warmest
* March: 16th warmest
* April: 5th warmest
* May: 2nd warmest
* June: 4th warmest
* July: 4th warmest
* August: 4th warmest
* September: Warmest (tie)
The first 3 months of the year were not as warm as recent months due to a La Nina event associated with cool Pacific ocean temperatures near the equator. As the La Nina has transitioned to neutral or even weak El Nino conditions, the Pacific ocean temperatures have warmed giving the global temperature - relative to average - a boost.