Home > climate change, NOAA Global Analysis > U.S. agencies: July is hottest month in recorded history

U.S. agencies: July is hottest month in recorded history

Land and Sea Surface Anomalies, July 2016

This graphic shows blended air and sea surface temperature anomalies around the world for July 2016. Temperature data is shown in degrees Celsius. Graphic courtesy NOAA National Centers for Environmental Information.

The records kept falling as July 2016 set new benchmarks for heat.

NASA said Aug. 16 that last month was not only the hottest July in recorded history, but also the hottest month known since temperature record-keeping began in 1880.

“It wasn’t by the widest of margins, but July 2016 was the warmest month since modern record keeping began in 1880,” Dr. Gavin Schmidt, director of the agency’s Goddard Institute for Space Studies, said. “It appears almost a certainty that 2016 also will be the warmest year on record.”

This July’s mean temperature was 0.1 degrees warmer than the previous July record holders that occurred in 2015, 2011, and 2009, according to NASA’s study.

The National Oceanic & Atmospheric Administration confirmed July’s status as the heat pacesetter for all months on Aug. 17.

NOAA said that July 2016 was 1.57 degrees Fahrenheit warmer than the average 20th century July and 0.11 degrees Fahrenheit above the previous record-holding month of July 2015.

That continued a decades-long trend for the month of the year that is the peak of summer in the northern hemisphere.

“July 2016 marks the 40th consecutive July with temperatures at least nominally above the 20th century average,” NOAA’s National Centers for Environmental Information said in a summary of the July temperature data. “July 1976 was the last time July global land and ocean temperatures were below average.”

The trend is not limited to every year’s July.

A new record for the warmest month of its kind has been set in each of the past ten months, according to NASA, dating back to October 2015.

NOAA pegged the hot streak at 15 record-setting months in a row.

The disparity is the result of differing methodologies used by the two agencies.

For the year of 2016 through the end of July, NOAA found that mean worldwide temperatures were 1.85 degrees Fahrenheit above the 20th century average.

The next-hottest January-July period came in 2014, when the average was 0.34 degrees F below this year’s measurement.

Both agencies use meteorological stations around the world to obtain air temperature data and ship- and buoy-based instruments to measure sea surface temperature. Antarctic research stations are also used to gather the data that underlies their monthly global temperature analysis reports.

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