Autumn is much like Spring in terms of walking in the hills.  The range of weather conditions that you can experience in such short periods of time, temperature changes with altitude or your placing on a hill or valley make a big impact on.  With such variability having good logic behind the clothing layers you put on make a big difference to the comfort level you experience while out in the hills.  Today, the temperatures had been in negative numbers for much of the night so the valley floor frost was melting back in weakening sunlight come mid morning.  Therefore, it was cold.  The first layer to think about was a woolly hat, time to put that in your pocket, ventile walking trousers for me and then a T-shirt, fleece and outer light shell jacket.  All layers were needed for the valley floor, even the runners had their hats on today but then the steeper climbs of the Fungle make you warm up from the inside so the outer shell jacket was opened up plus the big zip in the front of my fleece.  In a deep valley and tree lined the wind was light, also, with just a 100  metres of verticle added, the air was not so cold  (cold air sinks).  So having the ability to cool down is important but then the open heather hill top paths exposes the wind.  Time to zip up again, even put the hat back on but then the sun gets warmer and a dip in the hills provides shelter, time to zip down again but then turn the shoulder of a hill and the wind is blowing across 30 miles un-interrupted from the Cairngorms and its time to wrap up again, even in the even warmer sun.  Then its time to head down towards the valley floor, shelter and sun but then the sun disappears and the breeze disappears and the still cold air is still around in pockets.  While it is not as cold as when starting out the fleece provides the warmth.  No rain or wintry precipitation on this walk but that will come real soon.