WolframAlpha

Penman–Monteith Method Calculator

Apply the Penman–Monteith method to find the reference evapotranspiration.

latitude:
altitude:
month of the year:
mean relative humidity:
minimum air temperature:
maximum air temperature:
mean air temperature:
mean air temperature prior period:
mean observed sunshine hours:
wind speed at 2 meters height:
Also include: |
Assuming month of the year and mean air temperature prior period | Use instead
Assuming mean relative humidity | Use instead