Climate Control configuration - Team-RTG/Realistic-Terrain-Generation GitHub Wiki
When you launch Minecraft after installing Climate Control (CC) for the first time, the main configuration file (climatecontrol.cfg) gets created in your config folder, along with a folder called 'ClimateControl' which contains some additional config files. If you installed a supported biome-adding mod, there will also be a config file in the 'ClimateControl' folder that is specific to that mod.
CC's default settings should be fine for most users. However, if you're not sure about a particular option, feel free to post your questions in the thread.