ok the pictures you posted look like the same spider I had hanging out living on the foundation wall of my house but when I look up the name Araneus trifolium in the National Wildlife Federation Insects and spiders of North american book well it says the common name is a shamrock orbweaver and the picture looks absolutely noting like the pictures we have. and the other name is comes back as a marbled orbweaver and looks nothing like the spider pictures we have. The spider I took pictures of and watched for a few days lived on my wall and would go under the bottom shingle for shelter.. no web. possible webbing on wall I couldnt see but its abdomen is more diamond shaped then round of the orb weavers..So im at a loss it seems.. The spider looks similiar to a yellow sac spider I think.. I am just trying to make sure its not dangerous.