Brewer's: Borrowed days of March
The last three days of March are said to be “borrowed from April.”
March said to Aperill, I see 3 hoggs [hoggets, sheep] upon a hill; And if you'll lend me dayes 3 I'll find a way to make them dee [die]. The first o' them wus wind and weet, The second o' them wus snaw and sleet, The third o' them wus sic a free It froze the birds' nebs to the trees. When the 3 days were past and gane The 3 silly hoggs came hirpling [limping] hame.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894