The moon's path on the celestial sphere is close to the ecliptic but tilted some 5 degrees. For this reason, sometimes when the moon crosses the meridian for an observer in the U.S. it is higher in the sky than at other times. A similar phenomenon occurs with the sun as we see it from earth. The earth is also tipped and maintains the direction of tip without any change thoughout the year. Because of this, at one point in the year, the North Pole is tipped towards the sun and the South Pole is tipped away form the sun and vise versa. The following illustration should help you grasp this concept.
Notice that the earth's equatorial plane is tilted at an angle to the ecliptic plane. The lunar orbital plane is inclined to the ecliptic as well. Because of this, the moon can be overhead in latitudes of plus or minus 28.5 degrees. The following graph helps illustrate the variation of the moons latitude.
Looking at the first illustration, imagine you were at the earth's equator. Would the moon appear low or high in the sky? Still looking at the first figure, trace the path of the moon around earth on the lunar orbital plane. When the moon has gone half way around the earth from the position which the illustration shows, will it appear high or low in the sky to a person on the earth's equator? If you were standing on the moon, looking at earth, would it appear to change elevation in the sky?