Monomictic
A lake which has one mixing and one stratification event per year. If a lake does not freeze over in the winter, the winter winds will mix the waters of the lake. In summer, the lake resists mixing and becomes stratified because the surface waters are warm (light) and the bottom waters are cold (dense).

Glossary of stream, lake and watershed terms. (n.d.). Retrieved February 01, 2017, from http://kingcounty.gov/services/environment/watersheds/general-information/glossary.aspx