There are many ways to say that a person is big. A man can be “tall as a building” or “have his own zip code.” New York-born comedian and actor Billy Crystal said that, as a kid, he played basketball against someone so large, “he had his own climate.”
 
Crystal used the “he had his own climate” remark since at least the 1990s.
 
“How’s the weather up there?” (said to a tall person) is a similar saying.
 
   
Wikipedia: Billy Crystal
William Edward “Billy” Crystal (born March 14, 1948) is an American actor, writer, producer, director, comedian, and television host. He gained prominence in the 1970s for playing Jodie Dallas on the ABC sitcom Soap and became a Hollywood film star during the late 1980s and 1990s, appearing in the critical and box office successes When Harry Met Sally… (1989), City Slickers (1991), and Analyze This (1999) and providing the voice of Mike Wazowski in the Monsters, Inc. franchise.
 
He has hosted the Academy Awards 9 times, beginning in 1990 and most recently in 2012; a record second only to that of Bob Hope, who hosted 14 times.
   
Google Books
Laugh:
Portraits of the Greatest Comedians and the Stories They Tell Each Other
By William Claxton
New York, NY: William Morrow
1999
Pg. 36:
I mean, this guy was so huge, he had his own climate.
 
Google Groups: alt.quotations
Wanted: All Things “William”
Dave Wright
6/5/99
(...)
This guy was so large, he had his own climate. —Billy Crystal
 
Google Groups: alt.music.rush
Haikus
THE QEN MUNDI
4/6/00
(...)
Alex is so fat
That he has his own climate
And grows lasagne there
 
SkyNovel
700 Sundays
By Billy Crystal
New York, NY: Warner Books
2005
Pg. ?:
Play resumes, and I’m guarding a building in a pair of socks. This is the biggest man I’ve ever seen in my life, he has his own climate. He’s running upcourt, and I’m guarding him and he’s laughing at me.
 
2 May 2007, Washington (DC) Post, “Billy Crystal, Clearly Funny; Kennedy Center Awards Mark Twain Prize To Humorist and Humanitarian” by Jacqueline Trescott, pg. C1:
Some Crystal quips:
 
“Women need a reason to have sex. Men just need a place.”
 
“The guy was so large, he had his own climate.”
   
Google Books
The Stand-up Comedy Festival:
Send in the Clowns
By Aubrey J. Sher, Ph.D.
Xlibris Corporation (Xlibris.com)
2013
Pg. 69:
“That guy was so large, he had his own climate. Thanks, folks. I love you too.”
 
Twitter
Jewish Comedians
‏@JewishComedians
Billy Crystal: This guy was so large, he had his own climate. | #Quotes
2:53 AM - 13 Dec 2015