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.
Olivia puts on her train hat takes her family on a ride in her wagon. First it's just William, who is then joined by Perry, then Edwin, and finally Ian. The wagon gets heavier as each kid and pet climbs on board. At the end all the kids and pets are pulled in the wagon by Dad.