If you're able to go above and beyond to help us during this important time, please consider making an additional financial contribution. Click here to contribute. The climate in Southern Arizona between October and May is generally delightful with cool breezes and high scattered clouds. Come June, most of us will be scrambling for shade. Consider these possibilities for cooling your house and outdoor spaces. Sunscreens Sunscreens made of polyester with a vinyl coating are a low-cost, efficient way to stop 80 percent or more of the heat and UV rays coming through your windows. They are not like the screens that prevent bugs from flying in the house.