I’ve compiled the Attendance records of all games through the end of February. The league remands flat year over year. (Note: that no outdoor games are included in any of this visuals.)
The league got a bump from the Columbus Blue Jackets tear through the league earlier this season as well as the Oilers opening a new bar in Edmonton. Those gains were offset by big drops in Ottawa and Colorado.
Here is the interactive dashboard where you can look at individual teams detailed performance.
Overall the NHL attendance is relatively flat year over year with an increase from 17,233 last year through November games to 17,280 through this year.
On a team by team level, 4 teams saw an increase over 5% from last year while 3 teams saw declines of 5% or greater. Edmonton saw a large spike due to the new arena they are playing in this year while the Ottawa Senators saw the largest drop, down 13.3% through the November games.
You can drill into each teams performance to date using this interactive dashboard by selecting a team in the drop down in the upper right corner. (I apologize in advance. It is not mobile friendly.)