Central Indiana is well-known for its ice storms, and Rushville is no exception to this phenomenon. Ice can cause shingles to crack and tear off, causing leaks later on in the year. When ice thaws and then refreezes, it can cause parts of your roof to warp and become unstable. Pre-existing cracks in the roof only become bigger when ice gets in and expands the crack.
Even if you only have icicles, these can indicate ice dams further up on your roof. Ice dams prevent snow from running off the roof and melting as it should. Instead, the snow or ice melts and leaks into your how instead.