2020 was Earth's second-hottest year, just behind 2016

2020 was Earth’s second-hottest year, just behind 2016
A world map plotted with color blocks depicting percentiles of global average land and ocean temperatures for the full year 2020. Color blocks depict increasing warmth, from dark blue (record-coldest area) to dark red (record-warmest area) and spanning areas in between that were "much cooler than average" through "much warmer than average." Credit: NOAA NCEI

It's official: 2020 ranks as the second-hottest year on record for the planet, knocking 2019 down to third hottest, according to an analysis by NOAA scientists.

The average land and across the globe in 2020 was 1.76 degrees F (0.98 of a degree C) above average—just 0.04 of a degree F (0.02 of a degree C) cooler than the 2016 record.

The Northern Hemisphere saw its hottest year on record at 2.30 degrees F (1.28 degrees C) above the 20th-century average.

The world's seven-warmest years have all occurred since 2014, with 10 of the warmest years occurring since 2005.

It was also Earth's 44th consecutive year with global land and ocean temperatures, at least nominally, above the 20th-century average, according to scientists at NOAA's National Centers for Environmental Information.

2020 as ranked by other scientific organizations

NASA scientists, who conducted a separate but similar analysis, have determined that 2020 ties 2016 as the warmest year on record, sharing the first-place spot.

Scientists from Copernicusoffsite link also have 2020 tying with 2016 as the warmest year on record, while the United Kingdom Met Office ranked 2020 as the second-warmest year on record.

  • 2020 was Earth’s second-hottest year, just behind 2016
    A month-by-month animation of temperatures for January through December 2020 compared to the 1981–2010 average, with warm anomalies (difference from the average temperature) of some areas in red and cool anomalies in blue. The final slide shows the 2020 average. Credit: NOAA Climate.gov, using NOAA NCEI data
  • 2020 was Earth’s second-hottest year, just behind 2016
    An annotated map of the world plotted with the year's most significant climate events. Please see the story below as well as the report summary from NOAA NCEI at https://www.ncei.noaa.gov/news/global-climate-202012. Credit: NOAA NCEI

The state of sea ice

The 2020 average annual Arctic sea ice extent (coverage) was approximately 3.93 million square miles and ties 2016 for the smallest on record. The five smallest Arctic annual extents have occurred in the last five years (2016-20).

The annual Antarctic sea ice extent was near average at 4.44 million square miles.

Additional NOAA findings

  • Global tropical cyclones in 2020 tied a record: A total of 103 named storms occurred around the world in 2020, tying the record number seen in 2018. The North Atlantic played an unusually large role in the global activity in 2020, accounting for about 30% of the global accumulated cyclone energy (ACE) and named storms—which is more than twice its usual share.
  • Oceans were exceptionally warm: The 2020 annual global sea-surface temperature was the third highest on record at 1.37 degrees F (0.76 of a degree C) above the 20th-century average—only 2016 and 2019 were warmer. Record-high sea surface temperatures were observed across parts of the Atlantic, Indian and Pacific oceans.
  • Northern Hemisphere saw sparse snow cover: The average annual Northern Hemisphere snow cover for 2020 was 9.31 million square miles. This was the fourth-smallest annual snow cover in the 1967–2020 record.
  • December 2020: Last month's average across global land and surfaces was 1.40 degrees F (0.78 of a degree C) above the 20th-century average, making it the eighth-warmest December in the 1880–2020 .

Explore further

Earth just had its hottest September on record

More information: Assessing the Global Climate in 2020: www.ncdc.noaa.gov/sotc/global/202013
Provided by NOAA Headquarters
Citation: 2020 was Earth's second-hottest year, just behind 2016 (2021, January 15) retrieved 27 February 2021 from https://phys.org/news/2021-01-earth-second-hottest-year.html
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