Many people are now having trouble making their monthly house payments.
现在许多人都有支付按月房贷的困难。
You can refer to a publication that is published monthly as a monthly.
月刊 a satirical monthly. …一份讽刺月刊。
Monthly is also an adverb.
每月地; 每月一次地 In some areas the property price can rise monthly. 有些地区,房价能每月都涨。