Ànzhào nónglì, mèngxià yìbān zài yánglì de wǔyuè qiánhòu.
On the lunar calendar, the first month of summer usually falls around May.
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usage
孟 'first', 仲 'middle' and 季 'last' split each season into three months: 孟夏 is the 4th lunar month, 仲夏 the 5th and 季夏 the 6th. The other seasons follow the same pattern, as in 孟春. All of these are literary words.
