Seems to me there are windows of opportunity each winter. Could argue as to whether the length and number of these windows is diminishing as we move forward. We had one in November and just about finished with this Decembers. Sometimes a pattern emerges as to certain areas being hit repeatedly. This year the upper Midwest with MSP and across Northern half of Wisconsin look favored so far. Probably will have another again latter half of January. So far this winter locally has been about 3 events each barely able to cover the grass.