March comes in like a lion, and goes out like a lamb

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If the start of March was bad, the month should end with good weather

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Thomas Fuller’s 1732 compendium, Gnomologia: Adagies and Proverbs; Wise Sentences and Witty Sayings, Ancient and Modern, Foreign and British. The authors give the wording as “Comes in like a Lion, goes out like a Lamb.”