@lfrogg said in Edmonton Alberta Temperatures:

Surely to goodness Windy can be more accurate than that!

Windy accuracy depends on the weather models accuracy. And as @Ondřej-Šutera said Windy cannot make adjustments. The temperature displayed here is expected but not reported temperature as you say.
Indeed if you look at reported temperature at airport weather station, there was a discrepancy last Thursday when comparing it with the local predicted temperature. Difficult to explain why, as all models available in your area show more or less the same deviation, except Meteoblue

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During following days the forecast temperature (the dotted curve) is not so far from the reported one.