Been trying to figure this one out...

I track several parameters month/quarterly/annually in this fashion:

| Jan | Feb | Mar | Q1 | Apr | May | Jun | Q2 | Jul | Aug | Sep | Q3 |
Oct | Nov | Dec | Q4 | Annual |

In the monthly columns, I have values linked from another spreadsheet.
The Quarterly columns are the average of the preceding three months.
This part works fine with {=AVERAGE(IF(A154:C154<0,A154:C154,0))} in
Q1 for example. I use the array to eliminate a skew by future numbers,
i.e., it only averages non-zero cells.

Here's my quandary - to get the same functionality in the "Annual"
column, currently I'm placing the values from Q1,Q2, Q3 and Q4 in
contiguous cells elsewhere in the spreadsheet and using the same type
of array formula in the "Annual" cell on that block.

Is there a way to eliminate this step? The current setup just doesn't
seem elegant to me. I can't seem to figure out a formula that I can
place in "Annual" that will average the non-zero values from Q1,Q2, Q3
and Q4 since they aren't consecutive cells.

Thanks in advance...

Dave