How many conditions can I put into an if statement?

I wanted to put in twelve conditions, but it will not let me go past
seven. Is this the maximum number?

=IF($A1="january",SUM($B$1:$B$3),IF($A1="February" ,SUM($B$2:$B$4),IF($A1="march",SUM($B$3:$B$5),IF($ A1="april",SUM($B$4:$B$6),IF($A1="may",SUM($B$5:$B $7),IF($A1="June",SUM($B$6:$B$8),IF($A1="july",SUM ($B$7:$B$9),0)))))))

Thank you very much
Lynne


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Lynneth
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