With a good portion of the state stuck in dense fog for the past few days, the featured chart looks at the hourly frequencies by month having observed visibilities below one mile for Des Moines. The largest values are shown during the morning hours in winter time and another maximum late summer just after sunrise. Overall frequencies are higher during the winter time due to the occurrence of visibility limiting snow fall.

Voting:
Good = 24
Bad = 6

Tags:   climate   visibility