Nature Note:Indian Summer

For the past 10 days,it has been warm with cool nights.This is Indian Summer,which is a warm spell after the first frost.It is probably the last warm spell until April.It is harder and harder for warmth to build up as the sun's angle in the sky lowers,and the days shorten.Red is brushing the pin oak leaves.The Northern Sun forsythia is turning maroon even while it has bloomed lightly in the warmth.