Electricity analysis

I posted earlier this year about electricity use over the past 3 years. This chart is a bit different.

Here, I'm comparing the temperatures against the energy usage. There are lots of websites with historical weather data. I used the mean low temp for each two month period. Clicking on the chart makes it full-size.

It's no shocker to say that, the colder it gets, the more electricity gets used.

Yellow arrows indicate times we stayed at the house; this explains the ginormous spike at Christmas 2010. In fact, that spike is quite instructive. If and when we spend more time at the house in the spring and fall, we'll be paying a pretty penny (or öre) to keep the radiators on. We'll have to find a better way to warm the house... but that's a subject for discussing later!