According to the National Oceanic and Atmospheric Administration
The water levels of the Great Lakes fluctuate at different time scales to different forces. Very short-term water level changes, viewable in the interactive charts above, are caused by wind and storms. These short-term (hours to days) effects can be dramatic, and can cause the lake levels from one side of the lake to the other to vary by several meters for a short time. Each of the Great Lakes has an annual rise and fall cycle driven by the timing of precipitation, snow melt, and evaporation. In general, the lakes are at their lowest levels in the winter and highest levels in summer or fall. The range in annual rise is from 11 to 20 inches.
Great Lakes Water Level Observations
There is a chart here where you can seen some of the data for yourself.
Lake Erie also has short-term seiches, where the wind will push the water up on one side of the lake.
Lake Erie is particularly prone to wind-caused seiches because of its shallowness and its elongation on a northeast-southwest axis, which frequently matches the direction of prevailing winds and therefore maximises the fetch of those winds. These can lead to extreme seiches of up to 5 metres (16 ft) between the ends of the lake.