Temperature

Air temperature data are used when simulating snowfall and snowmelt processes during runoff calculations. They can also be used to compute daily evaporation rates. If these processes are not being simulated then temperature data are not required. Air temperature data can be supplied to GeoSWMM from one of the following sources:

·       A user-defined time series of point values (values at intermediate times are interpolated)

·       An external climate file containing daily minimum and maximum values (GeoSWMM fits a sinusoidal curve through these values depending on the day of the year)

For user-defined time series, temperatures are in degrees F for US units and degrees C for metric units. The external climate file can also be used to directly supply evaporation and wind speed as well.