When considering to built a new deck, think about how the weather and the seasons will affect the ways you use the new deck, and plan accordingly. The three main weather variables with which you need to concern yourself are sun, wind, and rain.
Sun - Decide how much sun and how much shade you want, and take this into account when you will be sitting on the deck. A deck on a north side of a house will be in shade most of the day. This can be an advantage if you live in a very hot climate and a disadvantage for most everyone else, like us in New England. An eastern exposure gives the deck morning sun and afternoon shade; this often is the best choice in warn climates. In cold climates, a southwest exposure provides full alte afternoon sun, making the deck warmer in cool days in the spring and fall.

Wind - If heat is a problem and you wnat to maximize the breeze, plan to prune trees or remove shrubs. If you have more wind than you want, you may need to plant new foliage. A raised de will be windier than one near the ground.For extreme conditions, you may need to construct a windbreak of some sort. A louvered or lattice wall covered with climbing plants is much more atractive than a solid fence and does a good job diffusing a strong wind.
Rain - Most of people think of sunny, clear weather as their best time to enjoy the life on the deck, but you may want just watch the rain. If your house's roof has a little or no slope, consider extending it to cover part of the deck. Or install a large set of sliding glass doors between the deck and the living room, so you can open the doors and enjoy the pattern of rain as it falls on your deck and potted plants.