"Actual" First Day of Winter represents a daily max temp equal or below 32°F and a snow depth of 1" or greater for several consecutive days.
"Actual" Last Day of Winter represents a daily max temp equal or above 32°F and a snow depth less than 1" for several consecutive days.
In the case of OSNW3, six(6), is used for "several" consecutive days.
Dates on graphical representations begin (from left to right) with the first measurable snowdepth through the end of the month of the "Actual" Last Day of Winter.
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