John Gill Commentary Genesis 8:5

"And the waters decreased continually until the tenth month: in the tenth month, on the first day of the month, were the tops of the mountains seen." — Genesis 8:5 (ASV)

And the waters decreased continually until the tenth month ,
&c.] 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:

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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 ^F8 , was Sunday the nineteenth of July: but according to Jarchi, whom Dr. Lightfoot ^F9 follows, this was the month Ab, which answers to July and August, the tenth from Marchesvan, when the rain began.

FOOTNOTES:

• F8: Ut supra. (Annales Vet. Test. p. 4.)
• F9: Ut supra. (Works, vol 1. p. 6.)