The planet known as Redland is tidally locked to its star. The planet has a hot spot, hot enough that inflowing rivers boil off, and the night side is far too cold to support life. The initial settlement is established in the relatively narrow band of life-sustaining temperatures, and all the subsequent expansions of the settlement follow suit.
The winds and currents of the planet pull water vapor towards the hotspot; once there, the immense heat turns it into a violent, permanent storm.
The cold, calm dark side of Redland is covered in snow and ice. As the system becomes more populated following Second Contact, this becomes a popular place to land and refuel for any craft capable of atmospheric flight; in the early 22nd century a fuel mining station is established there, and a small domed community builds up around it. (Those that aren't capable of atmospheric flight tend to go to Spring, instead.)