Couple of 
days ago we had a huge snowfall + ice rain. After that the temperature dropped down to -7 degrees C. As a result, all antennas were cowered by thick lay of ice and snow.
But the worst of all with the parabola. Due to the thick layer of ice and snow, its surface has slightly changed. So I lost about 4 db listening to the noise of the sun. Very unpleasant!