Genesis 8:5

And the waters decreased continually until the tenth month,.... That is, from the seventeenth of the seventh month, to the first of the tenth month, a space of two months and thirteen days, and being summer time, through the heat of the sun, they decreased apace:

in the tenth [month], on the first [day] of the month, were the tops of the mountains seen; not the tenth month of the flood, but of the year; the month Tammuz, as the Targum of Jonathan, and answers to part of June, and part of July; and the first day of this month, according to Bishop Usher h, was Sunday the nineteenth of July: but according to Jarchi, whom Dr. Lightfoot i follows, this was the month Ab, which answers to July and August, the tenth from Marchesvan, when the rain began.

h Ut supra. (Annales Vet. Test. p. 4.) i Ut supra. (Works, vol 1. p. 6.)