"The southernmost daffodil arrived in Jacksonville, Florida March 4th, and the northernmost daffodil arrived in Ft. Kent, Maine, April 27, 2011. The distance was 1812 miles in 56 days, 32.4 miles per day, or about 1 1/3 mile an hour."
This is the 21st year of their daffodil project, and the previous five years posted speeds of 12, 16, 20, 23.4, and 23.5 miles per day. It seems that a late-starting spring, such as was experienced in Boston this year, makes spring race up the coast to catch up. When a blooming daffodil was finally spotted in Boston, on April 5, spring quickly followed with a sudden, intense flowery display, unrivaled for the last many years.
See also: spring's progress, school postcard, it's a mile an hour, as the snow melts, spring arrives at three times the speed