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.
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| Monthly temperature anomalies with base 1980-2015, superimposed on a 1980-2015 mean seasonal cycle. (Credit: NASA/GISS/Schmidt) — View larger image |
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.
"Monthly rankings are sensitive to updates in the record, and our latest update to mid-winter readings from the South Pole has changed the ranking for June," said GISS director Gavin Schmidt.
"We continue to stress that while monthly rankings are newsworthy, they are not nearly as important as long-term trends."
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| A map of the September 2016 LOTI (land-ocean temperature index) anomaly, showing that much of the warmer temperatures occurred in the northern hemisphere. (Credit: NASA/GISS) — View larger image |
The modern global temperature record begins around 1880 because previous observations didn't cover enough of the planet.
Monthly analyses are updated when additional data become available, and the results are subject to change.
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