Hull City, Chelsea and Liverpool had equally good records over the month, taking 10 points from 4 games each, and the decision has swung in Brown's favour.
He previously won the Championship Manager of the Month award in March prior to winning promotion.
Meanwhile, Tigers striker Caleb Folan scored for the Republic of Ireland 'B' team in a friendly against Nottingham Forest last night and has now been promoted to the main squad for Wednesday's World Cup Qualifier against Cyprus.
Chairman Paul Duffen has revealed that on-loan defender Kamil Zayatte will join the club permanently from Young Boys in January. The deal will equal the £2.5million club record paid for fellow centre back Anthony Gardner.
Duffen went on to say that a loan offer for Nicky Featherstone from Sydney FC has been turned down.