[ichabod1]

How much does it vary every month depending on the tides?

[az_gila]

Looks like about a 3.5 ft tidal range...

https://tidesandcurrents.noaa.gov/noaatidepredictions/viewDailyPredictions.jsp?bmon=06&bday=26&byear=2015&timelength=weekly&timeZone=2&dataUnits=1&datum=MLLW&timeUnits=2&interval=highlow&format=Submit&Stationid=8638654