Volume doesn't tell you the mass. For that you'd need to know more about its density. With very hot air you may have very little mass and vice versa with cold air. This is to do with the link between temp. and density. Therefore, a colder temperature will give you a higher density which is a greater mass per volume and therefore greater thrust.
A measurement of volume alone isn't enough information.
*I'm only studying myself so hopefully others will contribute and confirm my suspicions.