Generally, by this time each year, we typically have prepared for at least one hearty snowfall, however this year we are experiencing a milder winter so far. Based on the 8–14-day temperature outlook map, provided by the National Oceanic and Atmospheric Administration (NOAA), we can expect to see changes shortly. Our Heating Degree Days have also been below average in recent months.
What are Heating Degree Days and how are they calculated?
A heating degree day is a unit of measure for how cold it has been over a 24-hour period. It is based on 65 degrees Fahrenheit; the temperature that is considered comfortable in our homes and wouldn’t need to use our heaters. The number of degree days is determined by calculating the mean temperature for the day and comparing to 65 degrees Fahrenheit. The mean is calculated by adding the high and low temperatures for the day and dividing it by two. If the mean temperature is 55 degrees Fahrenheit, then there is 10 heating degree days. The colder the winter, the more heating degree days.
Why do we need to know Heating Degree Days?
Heating Degree Days (and Cooling Degree Days in the warmer months) are used to track how much demand there has been for energy needed to heat/cool buildings. The larger the number of heating degree days, the more demand there will be for energy. This can affect the supply/demand of energy products such as Heating Oil and Dyed Ultra Low Sulfur Diesel.
https://www.weather.gov/ffc/degdays
https://www.cpc.ncep.noaa.gov/products/predictions/814day/814temp.new.gif
