The latest 15-day trend graphs for temperatures at 1500m in different regions in BC. Average for the day dotted black line. Low record of last 60 years dotted blue, high record dotted red. You are seeing 50 solutions of the same computer model for the temperature at 1500 meter. If lines light grey and one black thick one, that's the only one you get in other online forecasts, but the other 49 are as likely, sorry the other guys never tell you that are together, long range forecast feasible and reliable.