4. Black blindness grew white blindness
Indicating the slight difference between night and day.
Note in how few lines the poet pictures the passing of the day.
5. All being now seemed narrowed to a span, etc.
All else was shut from sight and to a degree from the mind.
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7. As with the waning day the great wind fell.
The sudden cessation of the wind at the close of the third day of the storm is characteristic, as is also the intense cold. Forty degrees below zero is not unusual, often even fifty degrees.
10. When, heifer-horned, the maiden moon lies down
A reference to the maiden Diana, goddess of the moon.