I believe it's $20 per month remaining on your contract. For you, that would be about $180.
BTW, we get terrible storms here in Texas and I rarely lose signal and when I do it's only for 5 minutes or so.
I don't deal with Snow, but I know many people in the Northern climates that have ways of getting the snow off the dish that helps (long broom, etc.). It also helps if your dish is easily accessible.