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NOAA Climate By The Numbers was released yesterday.  The warming index continues to rise across the globe.AC Heat-0128

May

The average global temperature set in May 2017 was 1.49 degrees F above the 20th-century average of 58.6 degrees, according to scientists from NOAA’s National Centers for Environmental Information. This average temperature was the third highest for May in the 1880-2017 record, behind May 2015 (second) and a record-breaking May 2016.

Season | March through May 2017

The average temperature from March through May was 1.66 degrees F above the 20th-century average of 56.7 degrees. This was the second warmest for this period, trailing the 2016 record.

*Year to date | January through May 2017

The year-to-date average temperature was 1.66 degrees F above the 20th-century average of 55.5 degrees. This was the second-warmest for this period, behind the record set in 2016.

A map of noteworthy climate events around the world in May.
A map of noteworthy climate events around the world in May. (NOAA NCEI)

Other notable climate events and facts around the world last month included:

Below-average sea ice at the poles again

  • The average Arctic sea ice extent for May was 5.3 percent below the 1981-2010 average, the fifth smallest for the month since satellite records began in 1979. The average Antarctic sea ice extent was 10.6 percent below average, the second smallest on record for May behind 1980.

Above-average snow cover in the Northern Hemisphere

  • The Northern Hemisphere snow cover extent was 9 percent above average, the 12th largest in the 51-year record. North America had its 18th largest snow cover, while Eurasia had its 12th largest.

Warmer-than-average lands and oceans

  • The globally averaged land-surface temperature (seventh warmest for the month of May) and the sea-surface temperature (third warmest) ranked second highest on record for the March-to-May season and the year to date.

Africa and South America lead continents in warmth rankings

  • Africa had its warmest May on record; South America, its fourth; Asia, it’s ninth; North America, its 15th; Europe, its 16th (tied with 2014); and Oceania, its 20th.

    From NOAA  Photo Credit John Vlahakis

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