Chicago's greatest snow cover

Dear Tom,
What has been Chicago's greatest snow depth at any one time?
Adam Zlotnicki, 9 years old
Dear Adam,
Many people think that Chicago's deepest snow cover occurred in the wake of
the city's 23-inch "Big Snow" of Jan. 26-27, 1967. Additional snowfalls
after the huge storm caused the city's snow cover to increase, reaching 28
inches on both Feb. 6 and 7, establishing an all-time record depth at that
time. However, that record was eclipsed during the city's benchmark winter
of 1978-79 that recorded 89.7 inches of snow. Chicago's snowpack reached 29
inches on Jan. 14, 1979, after 21 inches of snow fell from Jan. 11-14 during
the infamous "Blizzard of '79". That winter also holds the record for
consecutive days of snow cover: 100 days from Nov. 26-March 5.