by Carl Strang
April’s phenological signal held true in May’s first flowering dates. This year continues to run ahead of most, but not by much.
Median first flower dates this May at Mayslake Forest Preserve were 7 days earlier than last year (54 species), 5 days earlier than in 2013 (70 species), 18 days later than in 2012 (69 species), 4 days earlier than in 2011 (68 species), 7 days later than in 2010 (45 species), and 3 days earlier than in 2009 (46 species).
The respective numbers for April were, in the same order: 6 days earlier, 9 days earlier, 25 days later, 6 days earlier, 9 days later, and 3 days earlier. On the whole this shows the usual trend of convergence among years as the season progresses.