Count of monthly all-time highs per month since 1941.
August has delivered 24 new monthly highs since 1941. January has the highest count at 29 and June the lowest at 20. There are no surprises in the chart except that “sell in May and go away” has not been a good idea historically, since July has delivered the second highest count of new all-time highs at 28.
Data provider: Norgate Data