Output from uspest.org/wea Degree-day Model & Calculator web program:
Heat Units from daily weather data
============================CALCULATOR INPUTS=============================
Calculation method: single sine
Lower threshold: 0.01 degrees Fahrenheit
Setting upper threshold to: 130 F (default)
Directions for starting/BIOFIX: user specified
Starting/BIOFIX date: 1 1
No ending date, set to: default date 12 31
============================CALCULATOR OUTPUT=============================
Weather station: 1000 none selected
mn day max min precip DD 0 CUMDD 0 event
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