Days: A calculation used by
utility companies to determine how much energy is used for heating or
cooling. They count one heating or cooling degree day, respectively,
for each degree Fahrenheit below or exceeding 65: the temperature at which
people are unlikely to run either heaters or conditioners. Any day
can have more than one cooling or heating degree day.
Point: The temperature at
which air becomes saturated and moisture condenses into dew.
Line: A boundary separating
warm, dry air from warm, humid air.
Humidity: An indicator of
moisture in the air. A 50 percent relative humidity means the air is