Forecast Accuracy Ratings
Here is a brief description of how the application calculates ratings.
'Forecast Accuracy' window with weather providers ratings is available in 'Pro' version only.
Weather code is a number that corresponds to some kind of weather. Inspect the following links for details, please.
The forecast code is compared against actual weather code for the same day and the same provider. The equality gives 1 point, while the close result gives 0.5 points and the brute result gives nothing.
Codes are considered close if corresponding weather icons care the same. Here we assume that same weather icons correspond to close weather conditions for all providers.
RATING = THE SAME CODE + 0.5*CLOSE CODE [percent]
Weather code is provided by 'World Weather Online' and 'Open Weather Map'. For 'Weather Underground' the weather code is calculated based on weather description according to the table on their web site.
The forecast weather description is a string that describes some kind of weather, like "Light rain" or "Sky is clear". Weather description is compared against actual weather description for the same day and the same provider. The equality gives 1 point, while inequality gives nothing.
RATING = THE SAME DESCRIPTION [percent]
Weather description is provided by all used providers.
The forecast temperature is compared against the actual temperature for the same day and the same provider. The equality gives 1 point, while the close result (< 2℃ ) gives 0.5 points and the brute result gives nothing.
RATING = THE SAME TEMPERATURE + 0.5*CLOSE TEMPERATURE [percent]
Temperature is provided by 'Open Weather Map' provider only.
Temperature range is just two numbers, minimum and maximum temperature. The forecast temperature range is compared against actual temperature for the same day and the same provider. The belonging of actual temperature to the forecast temperature range gives 1 point.
RATING = BELONGS TO THE RANGE [percent]
Temperature range is provided by all used providers.
The points described above are summed separately for N days forecasts for all available N. The sum is divided by the number of forecasts for that N and multiplied by 100. So the resulting rating is "like percent".
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