If it's more than a one-person household, who you're sharing with really matters. I share a two-bedroom apartment.
Last winter's bill, with a housemate who uses an electric heater: 5.34kwh/day or 163kwh/month.
The winter before, with another housemate, who doesn't use an electric heater: 0.87kwh/day or 27kwh/month. (That seems ridiculously low - other quarters that year were still low, between 2 - 3kwh/day or 60 - 90kwh/month, but still more than double that, don't know what happened.)
So yeah, I'm probably pretty badass, but my current housemate isn't. ;)