From a blog post by Tom Content in the Milwaukee Journal Sentinel:

Winter heating costs remain below last year, helped by both the weather and natural gas prices.

Customers of Wisconsin Power & Light Co., based in Madison, saw heating costs fall 30% in December, compared with December 2008. December’s weather was colder than normal but it was warmer than the prior year.

For the last three months of the year, customers also saw heating costs fall 30%, compared with the same period last year, the utility said in its “natural gas update.”

For October through December, a typical customer paid about $269, but that was $116 lower than the prior year.