All other months except August ends with "ber". So by spelling, August is the odd one out.
school-wise, at least in some parts of the world, we don't have school in august, but we have school in all the other days, so august may be the odd one out because of that factor too (I know it's not universal, but still).
August is the answer, it is the only word without an 'r'.
If you found me here Darren, call me. P
august-The all other months ends in BER
Here is a list showing the month and a number for each month. Now decipher the logic and find the number for September October November & December
January 100 February 233 March. 334 April. 460 May. 512 June. 645 July. 760 August. 823
In October you would do this once. In November you would do this twice. In December you would do this three times. You would never do it in January. What is it?