local name = "regional_weather:deep_cave" local conditions = { max_daylight = 14, max_height = -100 } local effects = {} effects["climate_api:skybox"] = { sky_data = { type = "plain", base_color = { r = 0, g = 0, b = 0 }, clouds = false }, sun_data = { visible = false }, moon_data = { visible = false }, stars_data = { visible = false } } climate_api.register_weather(name, conditions, effects)