“How did the skeleton know it was going to rain?”/“He could feel it in his bones.”

A popular Halloween riddle about skeletons is:
 
Q: How did the skeleton know it was going to rain?
A: He could feel it in his bones.
 
The joke has been cited in print since at least 1976.
 
   
Google Books
Biggest Riddle Book in the World
By Joseph Rosenbloom
Illustrated by Joyce Behr
New York, NY: Sterling Publishing Company, Inc.
1976
Pg. 58:
How did the skeleton know it was raining?
He could feel it in his bones.
 
14 May 2001, Los Angeles (CA) Times, “The Kids’ Reading Room; Reading by 9; Jokes & Riddles,” pg. E7:
How did the skeleton know it was going to rain? He could feel it in his bones. (Jazmin, 10, Rio San Gabriel Elementary, Downey)
   
Google Books
The Sleepover Joke Book
By Sandy Ransford
New York, NY: Puffin Books
2003
Pg. ?:
How did the skeleton know it was going to rain?
He could feel it in his bones.
 
Twitter
Mutant
‏@Mutant
All Hallows Eve: How did the skeleton know it was raining?  He could feel it in his bones!
6:59 AM - 31 Oct 2007
 
Twitter
GoL Wobenzym
‏@Wobenzym4Life
Q: How did the skeleton know it was going to rain?
A: He could feel it in his #bones!  Build better bones at http://www.growbone.com
11:36 AM - 10 Aug 2009
 
Google Books
The Funniest Spooky Joke Book Ever
By Joe King
New York, NY: Andersen Press
2013
Pg. ?:
How did the skeleton know it was going to rain?
He could feel it in his bones.
 
Google Books
Super Hot Jokes For Cool Kids!
By Various Authors
London: Buster Books
2014
Pg. ?:
How did the skeleton know it was going to rain?
He could feel it in his bones.