I should have known
Posted by CypressTX on 9/14/2009, 7:54 pm
that a Wisconsin site would explain it better:

http://www.dnr.state.wi.us/org/caer/ce/eek/veg/trees/treestruecolor.htm#weather

The amount of rain in a year also affects autumn leaf color. A severe drought can delay the arrival of fall colors by a few weeks. A warm, wet period during fall will lower the intensity, or brightness, of autumn colors. A severe frost will kill the leaves, turning them brown and causing them to drop early. The best autumn colors come when there's been:  a warm, wet spring a summer that's not too hot or dry, and a fall with plenty of warm sunny days and cool nights.
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What is the True Meteorological Date ... ??? - BobbiStorm, 9/14/2009, 9:05 am
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