True, it broadens the discussion, but there is no evidence that Oakmont experienced such difficulties.
As for the weather, the USGA schedule for the the Amateur looked like this from 1895 through 1916: Oct, July, Sept, June, Sept, Oct, July,
Oct, June, July, Sept, June, June, Aug, June, June, June, Aug, Sept, Aug, June, and June.
I'd
hazard a guess that Oakmont may have had fine turf in at least one of those months.