Degree Days. Degree Days are computed for the Standard Degree Day Report (see figure below), Custom Reports, and for the Insect Models. SpecWare calculates the total degree days accumulated and requires temperature data measured by the thermistor inside the WatchDog. External temperature sensors cannot be used to generate these re- ports. (See Soil Temperature, p. 42). Three methods are used to calculate degree days; Growing Degree Day, Single Sine, and Actual Degree Day. The Growing Degree Day Method (GDD) considers only the high and low temperatures (Thigh and Tlow) for the day along with user-selected values for the base and upper limit temperatures to compute the total number of degree days acquired. The formula is: ½(Thigh + Tlow) - Base If Thigh is above the upper limit, the upper limit is used for Thigh. If Tlow is below the base temperature, the base temperature is used for Tlow. In addition to the GDD, both the Single Sine and Actual (Integral) Degree Days are also displayed in the GDD report. The Single Sine method uses the day's maximum and minimum temperatures to gen- erate a sine curve. The area between this curve and the lower threshold temperature is the GDD. The Actual Degree Days (ADD) method employs a calculation similar to the GDD but is done on the hourly values rather than on daily values. The ADD method is the most accurate.
Degree Days. (a) Local 1001 only. In accordance with current practice, in De- partments which historically curtailed operations due to low tem- perature and/or other weather factors, the Standard Temperature Station will be the Airport determined by the Department. A De- partment will not change the traditional historic factors at which its operations have been curtailed without notice to and consultation with the Union. Days off because of Degree Days will be credited for purposes of computing seniority and benefit entitlement. Days off because of Degree Days will be assigned first to all seasonal employees and then to probationary employees, and then, if necessary, on a rotating basis by inverse seniority to career service employees within the Bureau. An employee scheduled for a Degree Day must continue to be told on the preceding work day to call the assigned Bureau or De- partment at least an hour prior to the normal starting time the morning of his/her Degree Day to ascertain whether he/she shall report to work. An employee shall have no claim under this Agree- ment if the employee fails to comply with this Section. In the event that employees are sent home during the work day because of temperature or other weather-related factors, and there is a need for additional work to be performed in other loca- tions, the Employer will assign such work to employees that oth- erwise may be sent home on a rotating basis of seniority.
