Easter may have been early this year but I don't think that Spring has been. It is only in the last couple of weeks that the daffodils and other spring flowers around the garden have been providing what might pass for a floral display. The winter months have been very mild albeit extremely wet. That leads me to the conclusion that length of daylight must be the most important determinative in the flowering of bulbs.
Most of my daffodils, even the minatures in the rockery, are traditional yellow ones. Mr Wordsworth would approve. Come Autumn time I think that I will invest in some white flowered varieties so as to provide some colour contrasts in the early months of 2017.