60% is a low signal quality reading, depending on your general location, dish size, and satellites/channels you're viewing.
A larger dish will help with rain fade, which is just a lessening of signal, during rain, the only time you should lose signal, on a strong satellite, is during snow, or really heavy, torrential, rain.
I would also check your cable connections, to see if they are weather proof, and no rain is getting into your cable, or LNB.