Usually it will not, but very heavy rain or snow can degrade the signal. Signal may also be affected by wet snow sitting on the dish itself, so try to clear snow off the dish if it starts to accumulate.

To supplement the other answer... I have never had a problem with snow and ice buildup interfering with a satellite signal, but I know people who have. You can purchase covers for the dish that can be left on for the entire year. They prevent snow and ice from accumulating on the dish surface. The satellite signal can experience dropouts during a severe snow or ice storm, but I have yet to have a complete signal loss. (I live in Ottawa, Ontario, and we get our fair share of snow and ice.) I have experienced complete signal loss in the summer during severe storms. The interruption is usually quite brief, typically lasting less than five minutes. I have found that the very dense clouds and heavy rain that accompany some storms and squalls interfere with satellite signals far more than winter weather. In terms of reliability, I have found satellite service to be superior to cable television, both analog and digital. I found that analog cable television was plagued by poor signal quality and service interruptions. Digital cable offers a comparable picture quality to satellite, but suffers from almost as many service interruptions as analog cable.

yes