Yes, it is very possibly that moisture is getting into something and causing the crackling and static.
But don't just think the cable to your house. I've seen incidents of this where the moisture was getting into a connection box a mile from the location. It took repeatedly calling the telco every time it happened to find it. The problem was they would dispatch out repair until the next day. By then the rain had stopped and the line had cleared up. They finally found it when we went through a period of about 3 days of steady rain.
The way to find out for certain is wait for the problem to occur, then go to your network connection point, disconnect all the inside wiring from the telco wiring and put a phone on the telco wiring. Test. If you still have static it's a telco problem. If it's quiet then the moisture may be getting into your inside wiring, or even the network connection pint if it's outside, and causing the problem.
Hope this helps.
Take care, Rich
God bless the USA