|EF   Earliest freeze
LF   Latest freeze
ET   Earliest thaw
LT   Latest thaw
LDF   Least days frozen
MDF   Most days frozen
|Median freeze date:     November 30th
Median thaw date:       April 19th
Average time frozen:   140 Days
The freeze date occurs when the entire lake is frozen (ie, no open water anywhere on the lake).
The thaw date occurs when the ice is completely gone (ie, no ice floating anywhere on the lake).