https://www.ncei.noaa.gov/news/global-climate-202009
The September 2020 globally averaged temperature departure from average over land and ocean surfaces was the highest for the month of September in the 141-year NOAA global temperature dataset record, which dates back to 1880.
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The September 2020 global land and ocean surface temperature was the highest for September in the 141-year record at 1.75°F (0.97°C) above the 20th-century average of 59.0°F (15.0°C). This value surpassed the now second-highest September temperature that took place in 2015 and 2016 by 0.04°F (0.02°C).
September 2020 marked the 44th consecutive September and the 429th consecutive month [35 years + 9 months] with temperatures, at least nominally, above the 20th-century average.
The 10 warmest Septembers have all occurred since 2005. The seven warmest Septembers have occurred in the last seven years (2014-2020).
The Southern Hemisphere’s land and ocean surface temperature departure from average for September 2020 was the highest on record at 1.26°F (0.70°C) above average, surpassing the previous record set in September 2015, 2017, and 2018 by 0.02°F (0.01°C). Meanwhile, the Northern Hemisphere had its third-warmest September on record with a combined land and ocean surface temperature departure from average of 2.18°F (1.21°C).
Europe had its warmest September on record with a temperature departure from average of +4.19°F (+2.33°C). This exceeded the previous record set in 2018 by 0.40°F (0.22°C). South America, Asia and Oceania had their second-warmest September on record.
Warmer-than-average temperatures were present across much of the globe during September 2020, with the most notable warm temperature departures from average across parts of the North Pacific Ocean, southwestern Canada, the western contiguous U.S., South America, Europe, northern and southeastern Asia, Australia and Antarctica, where temperatures were at least 2.7°F (1.5°C) above average. Cooler-than-average conditions were limited to parts of Greenland and surrounding Atlantic Ocean, eastern Canada, the eastern U.S., the tropical eastern and central Pacific Ocean, the southern Indian Ocean and the western part of Asia and northern Africa.
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The September average Arctic sea ice extent was the second smallest for September on record at 961,000 square miles (38.8 percent) below the 1981-2010 average, according to analysis by the National Snow and Ice Data Center (NSIDC) using data from NOAA and NASA. Only September 2012 had a smaller extent. On September 15, the Arctic sea ice extent reached its minimum annual extent of 1.44 million square miles, which is the second-smallest minimum extent on record, behind September 17, 2012. The 14 smallest minimum annual extents have occurred in the last 14 years.
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The year-to-date global land and ocean surface temperature was the second highest in the 141-year record at 1.84°F (1.02°C) above the 20th-century average of 57.5°F (14.1°C). This value is only 0.07°F (0.04°C) shy of tying the record set in 2016.
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