Definition of "wether"

I am a tainted Weather of the flocke, / Meeteſt for death, the weakeſt kinde of fruite

c. 1596–1598 (date written), William Shakespeare, “The Merchant of Venice”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene i], page 179, column 1

There was a great fyer in the chamber, the wether was colde, and I saw now and then a Bishop come out;cited after Samuel Roffey Maitland, 1866, p. 8

1527, George Joye, The storie of my state after the bishop had receyued the pryours letters‎