Your single 20 year chart also shows the sharp one week drop in July only being a single 20yr period smooths it out more. It is odd to see such a plunge for so short a time frame on a seasonal chart. But other than a week in July the seasonal trend in all time frames is up from mid June through August. No holy grail and anything can happen in any given year but is worth paying attention to and knowing what the trend is going forward. Especially with price at a significant support area. I wouldn't for instance get short here unless the price clearly broke down. A long position near $90 would be the highest odds trade. Or stand aside.