How bad has this winter been? In the propane industry, we use what are called heating degree days. Without getting into a long explanation or why or of how they are calculated, just know that the more degree days, the colder it has been in a particular month or year. The chart below shows monthly and yearly heating degree days since 2000 for Mid-Michigan. For most people, the data on the bottom 5 rows of the chart will likely be of the most interest – last winter, this winter, the mean, the coldest and the warmest. According to the