On August 1, Google (via Danny Sullivan’s @searchliaison account) announced that the release of a “broad core algorithm update.” Algorithm trackers and webmaster chatter had confirmed multiple days of heavy ranking flux, including the MozCast system.
On the dates of August 1st and 2nd, temperatures peaked, while there was a sustained 4 day period ranking flux. It’s very possible that, despite things are settling back down, we may not be seeing the last of this.
According to the MozCast chart, August 2nd set a 2018 record at 114.4°F. Even though MozCast originally tuned to an average of 70°F, 201-2018 average temperatures have been found to be closer to 90°F in 2018.
Dr. Peter J. Meyers has written a piece on Moz.com that talks about the August 1st Google Core Update. It talks about the temp by vertical, the top 30 winners and losers of the update! Check it out!