I checked the Enviro Canada site to see what they listed as rules to windchill and humidex. Humidex call is
For humidex they dont display unless it is at least 25C (77F), with a dp >0c and air temp of >20c. Usually not discussed unless over 30C.
It will be shown in current conditions if
0 (32F) with a wind over 2km/h (1.24mph)
It will only be shown in a forecast if significant
-25C or > (-13F) (with wind over 10km/h 6.2mph)
Interesting that NWS mentions somewhere that 50F is the breakpoint for windchill. Both the enviro Canada site and the NWS calculators will not even give you a windchill value above air temp of 41F (EC limit is 39..)