Lets rule some things out first.
Do you have any christmas lights up on the roof eves?
Do you have any light fixtures or spotlights connected under the roof eves?
And do you have vinyl siding or aluminum siding, like a can.
Do you have a fence around the house or a swimming pool?
If you have any of this, it may be a grounding or bonding issue concerning your homes electrical system. This will require a Licenced electrician to scope it out.
If you do not have anything I mentioned, contact your local utility company and they will look at the issue for free....if it is caused by the utility, they need to know.
Please DO NOT do this on your own, If you can see this jump...it is capable of killing you.