Toronto Weather Forecast, maximal polite

Tonightterrible-14Mainly cloudy. 30% chance of flurries early this evening. Wind up to 15 km/h. Wind chill minus 6 in the evening and minus 22 overnight.
Saturdayterrible-12Snow. Amount 5 cm. Wind becoming northeast 20 km/h gusting to 40 in the morning. Wind chill near minus 23.
Saturday nightterrible-19Snow ending before morning then cloudy. Amount 2 cm. Local blowing snow in the evening. Wind north 40 km/h gusting to 60. Wind chill minus 20 in the evening and minus 33 overnight. Risk of frostbite.
Sundayterrible-15Sunny. Windy.
Sunday nightterrible-21Clear. Windy.
Monday nightterrible-16Clear.
Tuesdaybad-6Cloudy with 30% chance of flurries.
Tuesday nightbad-6Periods of snow.
Wednesdaygood2Cloudy with 60% chance of flurries.
Wednesday nightbad-7Cloudy periods.
Thursdayok-4A mix of sun and cloud.
As of Fri Jan 18 18:45:01 2019

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How does hogdex come up with the ratings?