"The Weather on Mercury" by William Morrison is a science fiction novella published in the early 1950s. Set against the backdrop of Mercury, this story involves an expedition team sent to locate an intrepid explorer named Kalinoff who has mysteriously gone missing. The plot centers around the unexpected and bizarre weather phenomena on the planet, including rain and snow, sharp contrasts to its typically arid climate, as the team grapples with both environmental and interpersonal conflicts. As the crew navigates the challenges of the Twilight Zone on Mercury, they encounter a range of complications, particularly involving the character McCracken, whose impulsive actions create tension among the team. Amidst the backdrop of strange weather, the expedition leader, Captain Lamoureux, must manage the fallout from McCracken's mischief and the questionable motives of another crew member, Carvalho. The narrative takes a twist when they finally locate Kalinoff, revealing a clever ruse involving the planet's native inhabitants and their treatment of weather as a form of communication. This results in a blend of humor and tension as the men navigate their own conflicts while attempting to survive on a peculiarly unpredictable Mercury. (This is an automatically generated summary.)