This is an image of a histogram. A histogram is a type of geovisualization that displays tabulated frequency. Each year the National Weather Service performs a validation of the summer time UV Index forecasts. This histogram records the all the differences between the observation sites and the forecasts. The histogram shows that 26% of the time the UV Index is exactly correct. 65% of the time the UV Index forecast is within ± 1 UV Index unit. And 84% of the time the UV Index is within ± 2 UV Index units.
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