Why Are All My Weather Apps Different?

Measuring forecasting accuracy is far from simple. What is most important – temperature, rain or wind conditions? Is average overall error most useful, or how often a prediction meets reality? “There are many, many ways to measure forecasting accuracy,” says Eric Floehr, founder of ForecastWatch, a US company that analyses the performance of weather providers. “Different forecasters perform better on different measures, longer or shorter timeframes or in certain geographical regions.”

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