Which weather measurements are needed when calculating reference evapotranspiration?

The following are the needed weather measurements with their importance:

  • Solar Radiation – Constitutes up to 80% of the equation depending on conditions.
  • Air Temperature – Ties for 2nd place with wind speed.
  • Wind Speed – Ties for 2nd place with air temperature.
  • Relative Humidity – Has a noticeable effect when the air is really dry or really humid.

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