If POPE John Paul II doesn't mind a chill in the air, he can indulge his passion for swimming at a pool that has been made available to him next door to the Apostolic Delegation on Massachuettes Avenue.

Former Texas Rep. Clark Thompson and his wife, Libbie, one of the richest women in the United States, have turned their mansion and its unheated outdoor pool over to the pope and his entourage.

Libbie Thompson doesn't need to heat her pool. She has a new $150,000 lynx coat from Neiman Marcus to keep her warm . . .

Some congressmen aren't publicizing the fact, but they have warned staffers they will lose their jobs if they get caught using illegal drugs. Rep. Timothy E. Wirth (D-Colo.) told his aides recently they will be fired if it comes to his attention they used either marijuana or cocaine, even in the most private of circumstances.

White House Chief of Staff Hamilton Jordan's friends are worried that, even if he is eventually cleared, which they "expect him to be," he is being bankrupted by his legal fees. "How would you like to be paying lawyers $2,000 to $3,000 a day?" one White House aide asked last week. "We live from paycheck to paycheck around here. It's going to take Ham 10 years to pay if off" . . .

Sen. Edward M. (Ted) Kennedy's wife, Joan, ran into a friend at Holy Trinity in Georgetown recently and couldn't resist a little maternal bragging. Her daughter, Kara, she says, is into photojournalism and is showing more promise and talent than any of her cousins, "including Caroline" . . .

Redskins quarterback Joe Theismann is dusting off the last 2,000 remaining copies of a book he wrote in 1974 for pre-teen football players who might aspire to wear his cleats someday. The book, titled, "Quarterbacking," has been moldering in a warehouse as Theismann bided his time, waiting for stardom. He wrote the manuscript himself, in longhand, a laborious chore that took him nine months, so he isn't too interested in offers from other publishers who would like to see him come up with an updated version . . .

President Carter's motorcycle-riding sister, Gloria, is trying to persuade her mother to give her the portrait Andy Warhol did of "Miss Lillian." The likeness is worth at least $25,000 . . .

The Shah of Iran's ex-wife, Soraya, could still support herself in the current political situation in Tehran somehow caused her support money to cease. She reads palms, one of her jetset friends says, and foresees the future with enough clarity to have developed quite a following . . .

Elizabeth Taylor Warner's longtime secretary-companion, Chen Sam, has left her, reportedly to go into the fashion business in New York.