Last month was the hottest September on record: NOAA

San Rafael Glacier in Laguna San Rafael National Park, Chile
Insights | UIG | Getty Images

Last month was the world's hottest September on record, and it marked the fifth-consecutive month to achieve a record-setting temperature.

So far, 2015 has been hotter than any comparable period that has been measured since 1880, according to a report issued Wednesday by the U.S. National Oceanic and Atmospheric Administration.

"The first nine months of 2015 comprised the warmest such period on record across the world's land and ocean surfaces," and seven of those months have hit record warm temperatures, said the report. That beats previous records set in 2010 and 2014, respectively.

Climate change threat

For the United States specifically, last month was the second-warmest September on record. Temperatures broke records in nine states, and in much of the rest of the country thermometers climbed near record temperatures.

Last month's average global temperature on land was more than 2 degrees Fahrenheit higher than the 20th century average of 59 degrees Fahrenheit.

President Barack Obama hosts a roundtable with CEOs to discuss efforts to tackle climate change both in the United States as well as on a global scale at the White House in Washington October 19, 2015.
US climate pledge backed by dozens of companies

That is the furthest jump from the average among all 1,629 months since the record began in January 1880, according to the report. The average September temperature is increasing by about 0.11 degrees Fahrenheit every 10 years.

The average sea surface temperature was 1.46 degrees Fahrenheit above the 20th century average of 61 degrees Fahrenheit, also passing a record set in 2014. However, a few ocean areas, such as an area of the Atlantic south of Greenland, felt record cold temperatures.

The size of the Arctic sea ice is slightly larger than it was at its smallest point in 2012, but it is still at its fourth-lowest level since 1981.

Not every region of the world was warmer than normal last month, even though the globe as a whole is at its hottest in at least 135 years. Southern South America, far western Canada, Alaska, and parts of central Asia were cooler or much cooler than average so far last month, as were some European countries, such as Spain and the United Kingdom, the report said.