Is it just me, or do they do this every summer? NOAA: June, April to June, and Year-to-Date Global Temperatures are Warmest on Record July 15, 2010 Last month’s combined global land and ocean surface temperature made it the warmest June on record and the warmest on record averaged for any April-June and January-June periods, according to NOAA. Worldwide average land surface temperature was the warmest on record for June and the April-June period, and the second warmest on record for the year-to-date (January-June) period, behind 2007.