Having a degree days of heat/cool or average temp for the month would make a really easy way to see the correlation. Also, there could be slots for water, gas, and electric. My electric goes up in the summer due to AC and the gas goes up in the winter due to heating. Water would go up for people doing watering (garden, lawn) in the summer, too. Not sure if we would want cost of each or amount of each or both... I guess like Daox said, lots of variables.
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