Toronto Weather Forecast, maximal polite

Tonightterrible-3Partly cloudy. 40% chance of rain showers or flurries early this evening. Clearing late this evening. Wind west 20 km/h becoming light this evening. Wind chill minus 8 overnight.
Wednesdaygood10Mainly sunny. Increasing cloudiness in the afternoon. Wind becoming southwest 20 km/h gusting to 40 in the morning. UV index 4 or moderate.
Wednesday nightbad3Cloudy. Periods of rain beginning in the evening. Wind southwest 20 km/h becoming light early in the evening.
Thursdaybad7Cloudy with 40% chance of rain showers or flurries.
Thursday nightterrible0Cloudy with 40% chance of rain showers or flurries.
Fridaygood3Cloudy with 40% chance of flurries.
Friday nightbad-8Clearing. Windy.
Saturday nightok-2Clear.
Sunday nightok-2Cloudy periods.
Mondaygood1A mix of sun and cloud with 30% chance of flurries.
As of Tue Mar 19 18:45:01 2019

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How does hogdex come up with the ratings?