Earth's cryosphere is shrinking by 87,000 square kilometers per year

The diagram claims to show "The percentage of each area that experiences ice, snow or frozen ground at some point during the year". But I think it is mislabeled.

Where I live - Ottawa, Ontario - is shown in yellow which means 40%. That's about right for the fraction of the year we have ice/snow coverage. But in terms of the labeled quantity, we're at 100%. For several months of the year.