The etymology of 'winter', as best can be determined, is 'rainy season'. So depending upon your local climate you might like to slide those three-month windows

The etymology of 'winter', as best can be determined, is 'rainy season'. So depending upon your local climate you might like to slide those three-month windows around a bit. In my part of the UK November is definitely part of winter on that basis, which is why I like the Soltice-as-midpoint-of-season approach.