There is often a weather inversion and even though it is cold in the valley it can be much warmer at the Nordic Centre.  To get a better idea of what the conditions are up at the centre you might also try the AMA road cameras (click "more detail" to get current conditions) the cameras west and east of Hinton are both at higher elevations (but still not as hight as the nordic centre) and might give a better indication of what the temperature is at higher elevations.