Forecast accuracy from World Weather Online have been added, and you can see them on the "Last Month" table on both the summary and detail pages. They were added because they provide forecasts worldwide, and they use their own forecasting models and algorithms. They don't just repackage the NWS forecast or purchase forecasts from another provider. From World Weather Online's about page, World Weather Online...

"developed our own weather forecasting model which could deliver reliable and accurate weather information for any geo-point in the world. Our weather model is run along with other meteorological models to compare and deliver accurate weather forecasts."

I hope this makes ForecastAdvisor more useful and interesting!

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