Daily the tides change 4 times a day, so high low high low, you can imagine it as Earth's daily rotation beneath the Moon, but the other side has a same tide since all water wants to be in balance.
The Moon goes in a month around the Earth, and when she is New or Full (mistake in question!), together with the Sun all three are in one line and results in an extra attraction, which means extra high tides and extra low tides for that day.
So in your graph you surely have 4 up and downs every day, and let's say halfway the month draw the ups and downs higher and deeper, and again at the end of the month.marlies · 3 years ago