Judy wrote...
THANKS everyone. I did get my formula to work with one exception. The
column this fomula refers to (J) is also a formula based column and the
formula is filled quite a ways down the worksheet, meaning there are sever=
al
rows where #N/A shows until data is entered. If I make the ranges for
columns A and J only the populated rows, it works. If I use A:A and J:J, =
it
doesn't... I don't suppose there's a fix for that!
..=2E.

You can't do what you want using entire column references like A:A and
J:J. If you keep using them, you'll keep getting errors. JE already
pointed this out to you. If error values as results are fine with you,
go on using entire column references. On the other hand, if you want
numeric results, YOU CAN'T USE ENTIRE COLUMN REFERENCES.

Do you really have data in ALL rows in columns A and J? If not, you
could use the array formula

=3DSUM(IF(ISNUMBER(MONTH(A1:A1000)),(MONTH(A1:A100 0)=AD=3D9)*(B1:B1000=3D"A=
")))