At the south rim the average high is in the upper 50sF and the average low is in the mid 20s. See the link below for a TON of data from last year about that location. I don't think they have reliable weather data like that for the bottom of the canyon, but it will be noticeably warmer at the bottom than at the rim.
Mrs. Lift, also known as Momma, was the main antagonist of Throw Momma from the Train. She was Owen's old mother who mistreated him and his friend Larry. At the end of the film, it was revealed by Owen that she died from natural causes. She was portrayed by Anne Ramsey.
Lorne is unforgettable as doting mother; so is merry-go-round climax. First-class Hitchcock, based on a Patricia Highsmith novel and coscripted by Raymond Chandler. Remade as Once You Kiss a Stranger and the inspiration for Throw Momma From the Train. Trivia. Once again Hitchcock bought the rights to the original novel anonymously to keep the price down and got them for just $7,500.