NOAA reports that May, the period from March to May, and from January to May all have had the hottest combined global land and ocean surface temperatures since records began in 1880. Mays combined global land and ocean surface temperature was 0.69°C above the 20th century average of 14.8°C, with land temps being 1.04°C above the average.
Ocean temperatures were the second warmest on record, coming in behind the 1998 record, with global ocean temps being 0.55°C above the average for the past century of 16.3°C.
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