Used attributively before nouns, not as a stand-alone adjective. Common compounds: 月度报告 (monthly report), 月度计划 (monthly plan), 月度会议 (monthly meeting), 月度数据 (monthly data). It parallels 年度 (annual), 季度 (quarterly). 度 here means 'measured period'.
mistakes
Don't say 很月度 or 月度地. It's not a predicate adjective - you can't put 是...的 around it. 'The report is monthly' is 报告每月一份 / 报告是按月发的, not 报告是月度的.
