Timing Changes

Earlier Spring, Later Fall Could Mean 240 Days of Summer 1114

     The end of the US growing season is when satellites see the overall greenness of foliage start to decline.

     This shows a trend for end of growing season 9 days later over 36 years.

Foliage Season Under Fire from Climate Change 1013

At left, Concord MA, starting with Thoreau journals ~1850, and Boston MA
from Polgar, C.A, R.B Primack, E. Williams, S. Stichter, and C. Hitchcock. 2013.  "The effect of temperature on the timing of the adult flight period of Lycenid butterflies in Massachusetts."  Biological Conservation 160: 25-31

At right, England,

from Amano et al. (2010).

Spring Arrives Earlier, Fall Comes Later 0312

     From IPCC, 2007.  Many-species studies found (averages of range endpoints used) 0.8, 1.6, 4.5, 2.5, 2.85, 4.4, 3.1, 3.15, 6.3, and 0.45 days per decade earlier blooms or arrivals.  Grand average of these is 3.0 days per decade earlier.

Flowering Plants Bloom Earlier with Warming 0410 - Average is about 3.5 days/decade earlier.

Section Map: Bio Impacts