This is the 8747th most frequent Japanese word.
月別
"Monthly; by month."
Here, '月別' is used as an adverb describing how the operational costs are calculated 'monthly', emphasizing the segmentation by months.
学校の運営費は月別に計算されています。
The school's operational costs are calculated monthly.
In this sentence, '月別' is used as an adjective modifying '売り上げ' (sales), denoting the breakdown of sales by months.
月別の売り上げを分析して、次の計画を立てましょう。
Let's analyze the monthly sales and plan the next steps.
The term '月別' is used adjectivally for '気温推移' (temperature trends), specifying the monthly categorization of the data being analyzed.