Generally, the only month without something blooming in the yard is December. The witch hazel that is currently in bloom usually blooms right at the end of January, but in winter 2015, which was memorably wicked, this shrub did not bloom until March 11.
There is one detail: the flowers are quite small. This shrub forces me out the door to look for these flowers. When it drops below freezing, the petals roll up tightly inside the sepals; when it’s warm, the petals unfurl and flutter like tissue paper.