In easy and fairly accurate method for estimating potential evapotranspiration for most midlatitude locations utilizes mean air temperature and daylength.

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This is true. The method is called the Hargreaves-Samani equation and is commonly used as an alternative to more complex methods for estimating potential evapotranspiration. It assumes that the amount of water that can be evaporated and transpired by plants is roughly proportional to the amount of energy available from the sun, which is determined by daylength, and the temperature of the air, which determines how quickly water can evaporate.

In Easy and Fairly Accurate Method for Estimating Potential Evapotranspiration