Location | Microclimate
Each location has its own special climate. If your garden is on the south-facing side of a hill, it will be sunny and warm. If you are at the top of a hill, wind exposure will be greater but, in its favour, an elevated site usually has nice views. Near the sea, salty winds can do a lot of damage, but a seaside garden suffers less frost.
Find out if the site is in a frosty locality. Areas within a few miles of the coast are less prone to frost; inland gardens are much colder. The presence of full-grown cordyline palms is a good indicator that the area is not frosty.
Work out the direction of the prevailing wind; mostly, it is from the southwest, but it can be influenced locally by the layout of the street, or nearby hills. Established trees will give a good indication of wind strength and direction; they lean away from strong winds. Noise from roads, or factories, can be a factor to consider. Dust can sometimes be a nuisance, too. Trees help to reduce both of these problems.