Our utility bills are respectably low throughout the year, however, from December through to February, our gas bills are quite high, account our home being older and not as well insulated as a new home would be, so during the coldest months, December and January, monthly gas bills are typically in the mid to high $200's.
Hydro, which we're billed for every 2 months is typically in and around the $60 - $80 mark, with a slight increase over the course of summer when the central air is constantly in service, but really we don't notice much in the way of bill increases with the central air running. Probably because we have gotten used to it and don't really notice the minimal increase.
We're happy and wouldn't have it any other way though, because no matter where people are building around us now, there are no yards, no privacy, and no room for parking, but we have a classic home on a big lot, with all kinds of parking right within the confines of our property, and for us there's just no beating that, and as we improve upon the gardens and trees we have been adding to the property year after year, eventually it will be the dream property we have always longed for.
One thing that is terribly expensive is our property taxes, but that's a whole other issue.