The line graph illustrates the maximum percentage of surface ice covering three of the great lakes, namely Lake Superior, Lake Michigan and Lake Erie during 2000 and 2020, measured in percentages.
Overall, the three lakes experienced considerable fluctuations over the given period. While Lake Superior and Lake Michigan showed sharply changes in their figures, Lake Erie also fluctuated considerably before ending at lower level then its initial level.
Looking at the details, Lake Superior started at approximately 40% in 2000, rose to 50% in 2005, and then fell to around 30% in 2010 and then increased sharply to approximately 95% in 2015 before declining dramatically to 20% in 2020. Similarly, Lake Michigan began at 30% and remained stable in 2005, before decreasing slightly to around 25% in 2010. It then rose significantly to 80% in 2015 and fell to 20% by the end of the period.
In contrast, Lake Erie started at approximately 90% and remained unchanged in 2005. It increase slightly to 95% in 2010, before falling to 90% in 2015 and 40% in 2020.
