Oregon’s snowpack once again below average. What does ‘normal”’mean?

On the surface, it would seem to have been a pretty good year for snow in Oregon.

Every major ski area was open through December and heavy snow has disrupted travel over Oregon’s mountain passes multiple times during the holidays.

Yet Oregon’s snowpack is once again below normal statewide.

Source: Oregon’s snowpack once again below average. What does ‘normal”’mean?