The Cc value is a measure of soil moisture. It stands for "cylinder coefficient" and it is a ratio of the mass of water contained in a soil sample to the mass of the dry soil. It is calculated by dividing the mass of water in the soil sample by the mass of the dry soil and expressing the result as a percentage.
If the Cc value is less than 1, it means that the soil is relatively dry. This could be due to a number of factors, such as low humidity, high evaporation, or insufficient watering.