Averages per month for the year:
Water 30
Electricity 45
Gas 50
3 people (DH, me, and DH's adult son) in a 4 bedroom, 2.5 bath house.
I think our utility bills are rather cheap. The house is 3 years old, so double glazed windows, central gas heating and the house is "brilliantly insulated", as my DH says. It is a *very* warm house. It is also a semi-detached, so we get part of the warmth from the house attached on one side. We rarely run the clothes dryer, don't have a dishwasher, try to do big loads of laundry to save water, etc.
However, as we both don't like the heat, we do run fans, and even a portable air-conditioner when it gets too warm. When we run the A/C, the electric bill goes up about 15-20 (but that is rare).