For example, the house itself produces some dead shade during certain parts of the day. In those places the amount of light received is low and so is the temperature. Also there are many inter-actions between local temperature and moisture and the character of the soil. You can do this through the plantings themselves and by use of mulches and other practices, such as those for water control. Through careful selection of the site for a garden, kinds of plants to grow, and management practices, you can modify air drainage, local wind currents, sun and shade, humidity, the water both on and within the soil, and soil temperature.
Cold air is heavier than warm air.
If your garden is near the top of a slope, it may miss some late spring frosts or early autumn frosts because cold air tends to slide down the slope and settle in depressions. If your garden is in a depression, the total frost-free season there could be shorter than the average for your area. On gentle slopes, a tight fence, hedgerow, or vine-covered fence will block some of the air flow. Thus, the advantage of air drainage is lost. Strong winds are a handicap to some tender plants.