From a New Climate Summary from the National Oceanic and Atmospheric Administration (NOAA):
The globally averaged temperature over land and ocean surfaces for June 2017 was the third highest for the month of June in the NOAA global temperature dataset record, which dates back 138-years to 1880. The year-to-date global temperature was second warmest on record.
Climate by the numbers
The average global temperature set in June 2017 was 1.48 degrees F above the 20th-century average of 59.9 degrees, according to scientists from NOAA’s National Centers for Environmental Information.
This average temperature was the third highest for June in the 1880-2017 record, behind June 2015 (second) and a record-breaking June 2016. June 2017 marks the 41st consecutive June and the 390th consecutive month with temperatures at least nominally above the 20th-century average
*Year to date | January through June 2017
The year-to-date average temperature was 1.64 degrees F above the 20th-century average of 56.3 degrees. This was the second-warmest for this period, 0.29 of a degree behind the record set in 2016.
Other notable climate events and facts around the world last month included:Below-average sea ice at the poles continues
The average Arctic sea ice extent (coverage) for June was 7.5 percent below the 1981-2010 average, the sixth smallest for the month since satellite records began in 1979. The average Antarctic sea ice extent was 6.3 percent below average, the second smallest on record for June behind 2002.
Warmer-than-average lands and oceans
The globally averaged land-surface temperature (fourth warmest for the month of June) and the sea-surface temperature (third warmest) ranked second highest on record for the year to date.
Africa and Europe lead the continents in warmth rankings
Africa had its warmest June on record; Europe, its second (tied with 2007); South America, its third (tied with 2005); Asia, it’s eighth; North America, its 10th; and Oceania, its 50th (tied with 1927).