The water test for November shows no surprises in that the lake is uniform from top to bottom in both temperature and dissolved oxygen as is typical for this time of year. This is called turnover and occurs when the water is cooler and therefore a uniform density, and the wind can mix it completely. If you compare the graph from October to November this is a good illustration of how colder water has the capacity to hold more oxygen. In October, with a uniform temperature around 54 degrees, dissolved oxygen was at 9 mg/l throughout the water column. This month, the lake is colder at 46 degrees, and the dissolved oxygen has increased to 11 mg/l.