I need some help programming a climatic scenario, I have 12 different temperature projections corresponding to each month for next 50 years (2010-2060), for example: in 2060 Jan will increase 1.3 °C from 2010 value, for Feb 1.5°C and so on.

I tried to interpolate those values but WEAP takes the last one from Dec 2010 and interpolate to Jan 2060. I need an interpolation between Jan 2010 to Jan 2060 only with Jan values, and that way for every month.

I hope you can help me

Best Regards,
Andres Fernandez
Quito Ecuador

The way to do this is to embed an Interp function for each month inside the MonthlyValues function.

For example, if the January temperature increases linearly from 5 C in 2010 to 6.3 C in 2060, and the February temperature increased from 7 to 8.5, here is the expression to use:

MonthlyValues( Jan, Interp(2010, 5, 2060, 6.3), Feb, Interp(2010, 7, 2060, 8.5), Mar, Interp(2010, ...), ... )

Each month would have its own Interp function.

Jack