"The combined global land and ocean surface temperature was the warmest on record for May, March-May (Northern Hemisphere spring-Southern Hemisphere autumn), and the period January-May, according to the US National Oceanic and Atmospheric Administration (NOAA). Worldwide average land surface temperature for May and March-May was the warmest on record while the global ocean surface temperatures for both May and March-May were second warmest on record, behind 1998. The monthly analysis from NOAA’s National Climatic Data Center is based on records going back to 1880." Summary at Green Car Congress: NOAA: May Global Temperature is Warmest on Record; Spring and January-May also Post Record-breaking Temps Sources and details at NOAA - National Oceanic and Atmospheric Administration - NOAA: May Global Temperature is Warmest on Record Increased Antarctic sea ice extent is no reason for hope, because it indicates that ice is coming off the continent faster than ever. Because warmer air holds more water vapor the heaviest snows occur just below freezing temperature. Antarctica is still extremely cold, so increasing temperatures over the continent could naturally result in increased snowfall and an increase in the volume/mass of Antarctic sea ice.
