Membership in the Commission is achieved by a vote of the Executive Committee and Officers during the General Assembly of the Commission. Members of the Executive Committee are elected for a period of 4 years and can be re-elected once for a period of 4 additional years.

The Executive Committee is comprised of less than 25 Members, excluding the Officers. An increase in the number of Members for the next term can occur by a majority vote of the Members and Officers.

The Commission strives to ensure that its membership is comprised of active researchers with strong international reputations and expertise spanning the field of cloud physics and precipitation science, including representation of diverse observational and theoretical specialties. Appropriate geographical and gender balance is also desired. These factors are taken into consideration when nominating and electing Members.

In case of the resignation of a Member, the position will remain vacant until the next General Assembly and new elections.