The cherry trees around the Tidal Basin are Yoshinos, Punus X yehodensis. They rarely have fruit and are one of several types of Japanese flowering cherries. Even the cold of this relatively cold winter in DC should not bother them as I know there are cherries of this type growing in the metro NYC area.
The biggest threat to the blossom display is actually a late frost.
Thanks much...very interpreting. I like fruit tree blossoms they are a sign of life and renewal. Got some going on right now
very interesting.....