Here is a list showing the month and a number for each month

Here is a list showing the month and a number for each month
January = 73
February = 83
March = 51
April = 52
May = 31
June = 42
July = 41
August = 63

Decipher the logic and find the number for September = ?

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93 - 9 for number of letters in September and 3 for the number of vowels in September