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When Hudson Bay is completely frozen over, which on average is for less than three months of the year, it is closed to navigation. |
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On the average, Hudson Bay is open to navigation for as little as three months each year though it is only rarely completely frozen over. |
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Hudson Bay is open to navigation for as little as three months in an average year even though it is never completely frozen over. |
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Even though Hudson Bay is not completely frozen every year, on the average, it is open to navigation for less than three months. |
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On the average, Hudson Bay is closed to navigation for less than three months of the year, which is when it is completely frozen over |