The national average for a gas bill is between $40 and $150 per month, depending on the season, according to Apartment Ratings in 2011. Utility bills vary from city to city based on the source of the natural resources and the rate that utility companies choose to charge.
Zillow explains that gas utility bills can vary depending on what appliances require gas for heating. For example, a gas-cooking stove shouldn't accrue more than $15 per month to a bill, as of 2012. This includes cooking breakfast, lunch and dinner. On the other hand, if the water heater and heating require gas, then a utility bill could run as high as $300 per month during the winter.