Re: Temperature Sensor Placement & Sunlight

As long as your temp sensor is located where it is it will pick up the house warmed afternoon temperatures regardless of any types of shielding. The temp sensor will still measure the surrounding warmed air from the house. As Aardvark points out, the north side is the lesser of the bad locations if you have to be mounted on the house.  If you can place a pole out in the yard over grass, away from anything like gravel, cement, brick, decking, etc. you would be much better off and more accurate. Because the anemometer and temp sensors are cabled together, placement is not always easy and a compromise may have to be made.

Another idea would be relocate the sat. dish mount around on the north side of the house. (You mentioned "used to support the dish" so I'm assuming it's available to move.)
Good luck.