Green’s Dictionary of Slang

weather-peg n.

the nose.

1824		Pierce Egan’s Life in London 26 Sept. 5/2: [S]eeing die crimson coming so fast from his opponent's weather-peg, [he] was determined to finish the fight speedily.
1825		Pierce Egan’s Life in London 12 June 157/1: [He] elevated his fist and let it fall with tremendous violence [...] just above his weather-peg and the superior part of his physiognomy, commonly called the forehead.