I would use a ratio instead of a fraction, 9:30 (inches:days) which can be simplified to 3:10
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9 inches in 30 days = 3 inches in 10 days or, if you don't mind fractions, 0.3 inches per day - which is the unit rate.
Since a month consists of four weeks, a fraction of a month would be 1/4th.
There are 30 days in the month of June so 15 days would be half (1/2)
One tenth (1/10) !
Three tenths, which is 3 over 10, 3 -- 10