OSNW3 - 2013-14 Winter Season Duration - 109 Days

The winter of 2013-14 has come to an end. Spring is officially here, in my backyard. Let me review the the conditions that constitute a winter season. The definition of a Winter Season Duration (WSD) is as follows, and in the case of OSNW3, six(6), is used for "several" consecutive days.

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.

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.


The winter of 2013-14 lasted 109 days. It began on Dec 14, 2013 and ended on Apr 1, 2014. Below is a graphical representation.

What is locked into memory from last winter? It also lasted 109 days. It began later, ended later and was not persistently cold like this winter. Note the differences between last year (below) and this year (above). While it seems uncommon, we cannot rule out winter making a return this year, as it has happened before, but with specific long range forecasting techniques that scenario looks unlikely.

I have WSD data back through 1990 for Oshkosh/OSNW3. For the summaries please click here. If there are any questions, comments, or suggestions on the material presented please let me know. Thanks for reading!