Monthly ETo Calculation
Penman-Monteith Formula [Grass Reference Crop]
Input Data

Station : Month : Latitude (N) : Longitude (E) :
Altitude (m) : Wind Vane Elevation (m) :
Mean Temperature (C) : Mean Temperature of Previous Month(C) :
Relative Humidity (%) : Wind Speed (m/s) : Sunshine Hours (hrs.) :



Data Input

Station = ;Month= ;Latitude (N) = ;Longitude (E) = ;Altitude (m) = ;Wind Vane Elevation (m) =
Mean Temperature (C) = ; Mean Temperature of Previous Month(C) =
Relative Humidity (%)= ;Wind Speed (m/s) = ;Sunshine Hours (hrs)=

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Monthly ETo
Station = ; Month = ; Days/month =
Solar Radiation(MJ/sq.m/day) = 8.9011455930852
Radiation Term(mm/day) = NAN
Aerodynamic Term(mm/day) = NAN
Monthly ETo (mm/day) = NAN
Monthly ETo (mm/month) =NAN