So long as your dish is situated in a position to give a solid signal you will only get problems in the most dire weather such as heavy rain/thunderstorm when the thick black clouds can actually block the signal entirely, the same can happen during heavy snowfall.
I suffered bad line of sight problems due to trees. Every time I raised the dish all was fine until the damn things grew a bit and started interfering with the signal again.
I recently got a local contractor to mount the dish at roof height on the chimney stack. I've now got the best signal I have ever seen since I have been using Sky TV.
At my present age, by the time the trees grow high enough to interfere with the signal again, I won't be around to worry about it.
