June again set a record as the hottest June since widespread weather recording began. March, April, and May of 2010 were also the hottest versions of their respective months on record. The above map shows the deviations from the 1971-2000 average for each region of the globe. Looks like the eastern US, the European part of Russia, northern China, and far Eastern Siberia were the most anomalously warm. Greenland continued warm too.
This graph shows how this June compares to Junes past:
(This is NOAA's estimate of globally averaged temperature over land and ocean).