'es' calculates mean saturation vapour pressure based on air temperature.
Vector of length n containing daily maximum temperature [C].
Vector of length n containing daily minumum temperature [C].
Vector of length n of mean saturation vapour pressure [kPa]
Jedrzej S. Bojanowski
Allen, R.G., L.S. Pereira, D. Raes, and M. Smith. 1998. Crop Evapotranspiration: Guidelines for computing crop water requirements. Irrigation and Drainage Paper 56, Food and Agriculture Organization of the United Nations, Rome, pp. 300.
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