If you want to see how an inexpensive camera works outside, go to my weather website and click on the sky cam. That is the cheapest panasonic made, the BL-10. It is totally exposed on the mast to my anomometer, just a piece of duct tape over the top to protect it, yet it's an indoor camera. It has worked fine to -20F when in Maine. You can also click on the WX underground logo, then click on the picture on that page and you will see archived photos from that camera.
If you can live with that quality, look around, and don't pay more than $150 for one.