Hot days, which may require the use of energy for cooling, are measured in cooling degree-days. On a day with a mean temperature of 75 degrees F, for example, 10 cooling degree-days would be recorded (75 – 65 base = 10 CDD).
03/11/10 8:42am Forecast
Increasing clouds with little temperature change. Precipitation possible within 24 to 48 hours
Moon Phase: Waning Crescent
Sunrise 6:11am
Sunset 5:55pm
Heating and Cooling Degree Days
Hot days, which may require the use of energy for cooling, are measured in cooling degree-days. On a day with a mean temperature of 75 degrees F, for example, 10 cooling degree-days would be recorded (75 – 65 base = 10 CDD).
A heating degree-day is calculated when there is a 1-degree Fahrenheit difference between 65 degrees F and a mean outdoor air temperature of 64 degrees F, on any given day.
A degree-day compares the outdoor temperature to a standard of 65 degrees Fahrenheit (F); the more extreme the temperature, the higher the degree-day number. Thus, degree-day measurements can be used to describe the effect of outdoor temperature on the amount of energy needed for space heating or cooling.
Cold days are measured in heating degree-days. For a day with a mean temperature of 35 degrees F, 30 heating degree-days would be recorded (65 base – 35 = 30 HDD). Two such cold days would result in a total of 60 heating degree-days for the 2-day period.