Thanks to DavidL for the chart showing the relationship between averages and medians over the past 8 Februarys. Of course it is but a single data point that diverges, but it is remarkable the consistency of previous years.
Made me think about whether there is some kind of pattern there so I plotted monthly data for the last 22 years. Is there a pattern? Dunno. Might deserve some closer examination. More importantly we can all stop clicking that annoying "Newer" link.