Edible Tree Crop FarmEdible Tree Crop Farm was Dick Robert's pioneering permaculture site in Nelson, NZ before the term existed. A sub tropical climate was created with the use of North (equatorial) facing hillsides, ponds for thermal mass and heat reflection, wind breaks to divert cold winds, rocks etc.
A description of micro climates can also be found here. https://treeyopermacultureedu.wordpress.com/chapter-5-climatic-factors/microclimate/
Sepp Holzer's book should be in the public library and gives more practical advice.