This is a simple model that has monthly average temperature values measured in Sydney Australia as input. These values are entered into a Data element with a vector [Months] data type. The simulation runs on a daily time step and the constant monthly temperature is compared to interpolated values obtained from the monthly ones. The 2 methods of interpolation used in this model are linear and spline. Both of these methods require the formulation of an interpolated month counter that increments by fractions of the month as you walk through each month on a daily time step. This "Month_Interp" value is what we use as an index value to find the interpolated value.