Through the 15th of August, 2018 is the second warmest stretch since May 1st...
A list of the warmest 3 year periods on record from August to July. This past 3 year period from August 1, 2015 to July 31, 2018 is the warmest such period on record ending 3.4° above average. This beats the previous 3 year period from 2014 to 2017.
A chart showing all of the 3 year periods from August through July as we just finished up our warmest on record, dating back to 1872.
This chart shows the final temps for the most recent 2, 3, 4, and 5 year periods. The 3 and 4 year periods were the warmest on record. The other two time periods were still much warmer than average.