Heating Degree Days are a way that many analysts measure how cold the average winter temperature is
compared to other years. To calculate the heating degree day number, you subtract the average of a day's temperatures from 65
F. For example, if the day's average temperature is 50
F, its Heating Degree day number is 15.
Last winter, using Heating Degree Days as reported at the Burlington International Airport, it was 7% colder than the 10-year average. As of April 31st, there have been 7,031 degree days compared to 6,548 last year and a ten-year average of 6,603.
Unless you made improvements to your home's energy efficiency last year, you may have noticed the difference in your heating fuel usage.