How did Matt know it was well into August in the Sign of the Beaver?

In "The Sign of the Beaver," Matt knew it was well into August because he observed the natural signs around him, such as the changing behavior of animals and the ripening of the berries. He also kept track of time through the arrival of the seasons and the lengthening days. Furthermore, he noted the absence of his father's return, which indicated that summer was nearing its end. These observations helped him gauge the passage of time as he awaited his family's return.