Another month, another global temperature record. In August, I shared that July 2016 was the hottest month on record yet. In September, I reported that Detroit just had its warmest summer on record. Early this month, the news was warmest August on record so far as carbon dioxide passes 400 ppm 'permanently'. Today, it's NASA Analysis Finds Warmest September on Record By Narrow Margin.
September 2016 was the warmest September in 136 years of modern record-keeping, according to a monthly analysis of global temperatures by scientists at NASA's Goddard Institute for Space Studies (GISS) in New York.Climate Central cites NOAA, which could offer confirmation of the record next week.
September 2016's temperature was a razor-thin 0.004 degrees Celsius warmer than the previous warmest September in 2014. The margin is so narrow those two months are in a statistical tie. Last month was 0.91 degrees Celsius warmer than the mean September temperature from 1951-1980.
The record-warm September means 11 of the past 12 consecutive months dating back to October 2015 have set new monthly high-temperature records. Updates to the input data have meant that June 2016, previously reported to have been the warmest June on record, is, in GISS's updated analysis, the third warmest June behind 2015 and 1998 after receiving additional temperature readings from Antarctica. The late reports lowered the June 2016 anomaly by 0.05 degrees Celsius to 0.75.
It should be noted that the National Oceanic and Atmospheric Administration, one of the other gold standards for global temperature analysis, says the world has had 16 straight months of record heat (itself a record). It releases its September numbers on Tuesday.Welcome to the 400 ppm world.