With Detroit being at 19.3", even though it's only 5 more inches than Chicago, it really makes a difference in that there's a lot of years that we're at that point or lower by mid February. So it's not even worth looking up those stats for Detroit. However I did double check the Chicago stats just to see what years they were and I actually came up with 24 years not 22, And 3 years in the past 60 (you forgot 1997-98).