Spring and Autumn are seasons of transition in the Great Lakes Region.

Length of day influences temperatures in the region but not nearly as much as variations in solar energy due to changing sun angle.

Spring and Autumn are unique to the mid-latitudes; over one-third of the world experiences a tropical climate year-round where seasonal changes are largely absent.

Since the Lakes have ample opportunities to interact with the atmosphere to cause cooling or add moisture, the incidence of fog is rather high over and along the shoreline during the transitional seasons of spring and autumn.

Instruments on low Earth orbiting satellites provide excellent imagery documenting the transitional seasons.

March, April & May

September, October & November