Basically: Quoting from the study itself: Temperature Forecasts AccuWeather’s high temperature and overall (high and low combined) temperature forecasts had the lowest average absolute error. AccuWeather also had the highest percentage of high temperature forecasts and overall temperatures within 3°F The Weather Channeland Weather Underground tied for least average absolute error and most temperatures within3°F for low temperature forecasts. Precipitation Forecasts AccuWeather’s performance for probability of precipitation (POP) forecast accuracy was the best among the five providers analyzed. It achieved both the best Brier score as well as the best average absolute error when POP forecasts were compared to observed precipitation events. Wind Speed Forecasts AccuWeather’s wind speed forecast accuracy was the best among the six providers analyzed, ranking the highest for both average absolute error and average bias Why are all my weather apps different?