The Higher The Warmer
All forms of condensation are due to the chilling of the air, and some of the most extraordinary local climates are due to the fact that cold air, being relatively heavy, flows down-hill. Canalised in a steepsided valley, such air may form according to circumstances an invisible cold stream, or an invisible cold lake, with exact contours and surface marked by a level of ground fog or by the upper limit of destructive frost. Market gardens, hopfields and orchards should always have good air-drainage, as indeed should dwellings, and if they lie in the path of an air-stream, hedgebreaks should be planted athwart it. It is only, of course, in still weather that air flows in accordance with gravity, but the result may‘be that high ground is very many degrees warmer than low, a reversal of the natural order of things that gardeners are well aware of.
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https://paperspast.natlib.govt.nz/newspapers/BPB19471209.2.46
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Bay of Plenty Beacon, Volume 12, Issue 5, 9 December 1947, Page 8
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151The Higher The Warmer Bay of Plenty Beacon, Volume 12, Issue 5, 9 December 1947, Page 8
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