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What is the difference between Real-Time ET and Historical ET?

April 26, 2017ET Historical real-time

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What is the difference between Real-Time ET and Historical ET?

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Real-time evapotranspiration (ET), such as that provided by the WeatherTRAK ET Everywhere service, is calculated using actual daily weather data from the local area. Historical ET is based on historic averages of weather conditions across a large region. Analysis has shown that Historical ET can diverge from Real-time ET by as much as 225% on any given day.