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"Save the people of Gaza"
(set 5 days ago)
Location: St. Louis Park, MN
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Quote:
Originally Posted by Liberty1776
Leaves on deciduous trees do not change color from only falling temperatures. Actually, they change color primarily because they get LESS LIGHT.
Temperatures still affect it, though. Otherwise, trees would change the same time each year like clockwork. And how come mountainous areas change weeks before lowlands? In late October 2015, some trees were already peaking into a dark red. Those same trees were bright summery green last October and did not peak until later in November. We had a very warm fall last year.
Alder trees in Seattle start to slowly turn yellow and drop leaves in late august ...
I noticed something similar with red maples when I lived in Seattle. Often - maybe even usually - some red maples would start to turn orange sometime in August. I always figured it was as much due to the dryness as due to the shortening days, since red maples are native to the east and aren't really adjusted to Seattle's dry summers.
Peak around mid- to late -September in Northern (Arctic) Norway, will start a little earlier at altitude / inland. So at the treeline it will start by the end of August.
A few images from Wikimedia (don't know how to get them smaller)
Sep 22. at Hinnøya E of Lofoten, seems to be near peak:
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