Just a casual observation by me, no doubt induced by the current rainy spell.
Looking at the tree top growth of the nearby oaks, birches, & conifers....it sure seems like the summers of 2006 and 2007 were good for growing tree height.
If I remember correctly, the summers of 2006 and 2007 had more cool and wet weather than in previous years. I recall 2006 being like all rainy from May 15 to Aug 15. Last year, 2007, was a bit dryer, but still rainy. Summer 2008 has only just begun so only time will tell for this summer?
'Don't like today's weather, just wait till tomorrow, or the next day, or the next day, or the next day.'